Pete the Pieperson

Motorhome

from the GMC Motorhome People

A publication dedicated to the preservation of a classic and timeless vehicle

by Walt Sener September 1995 PETE THE PIEPERSON Number 5 In the good old days, people would greet vendors born egotists and are easily induced to provide with a friendly smile.The iceman, postman, milk- melodious cadence for any parade. Instead of pol- INSIDE: man and breadman were typical. Gender never ishing fire equipment for the next parade, music- seemed to be an issue. Firemen responded men polish technique with a local band, which is WHAT’S NEW promptly,policemen were ever present, and an most often in dire need of replacement uniforms. endless list of servicemen were available to solve Some method must be employed to raise funds. • 3.42 POWER daily problems, including those related to the Well,how about selling pies? COLORING GMC Motorhome. Accordingly,the pie committee promptly Point in fact.A service manager in Billings, appointed the (only) member with a motorhome BOOK Montana confirmed my suspicion that a “click- — and his muscular friend Pete — to “fetch” SANDUSKY ing” constant velocity (CV) joint needed to be freshly-baked Shoofly pies from a bakery located SERVICE replaced. Since all the service bays were busy,he where else…near Paradise, Pennsylvania. Each pie suggested that new components be obtained from was sealed in a pie box.There were eight boxes COACH TALK the parts counter in the interim.At lunch break, a in each two-cubic-foot shipping carton.Weight mechanic would probably be available. was estimated at thirty-two pounds per carton.At •SEWER ODOR A courteous partsperson identified the GMC this point a quick weight and balance computa- •THROTTLE KICKER Motorhome part number by gazing at a spot on tion seemed to be in order.After all, we had the ceiling. She also suggested a replacement dust promised to pick up two hundred and seventy- •OIL CONSUMPTION cover, citing a different GMC Motorhome part two Shoofly pies! number from the same mysterious source. How In true GMC Motorhome fashion, four cartons •QUICK COUPLER did she know? It seems there had been several were stashed under the bed, sixteen cartons on top •REFRIGERANT intensive GMC Motorhome parts seminars, and of the bed, two under the (now converted) CHOICE she had retained the vital group categories of dinette, eight on top of the dinette bed, two information. Besides, spares were usually in stock. stacked between the barrel chairs, and sixteen R12, R134A, FRIGC, R406A While waiting, I became fascinated by one individual pie boxes carefully nested on the (clean) mechanic whose sole responsibility was to per- floor of the shower. •TRANSFER SWITCH form lube, oil and filter (LOF) service…in thirty There were a number of sobering and nostalgic TODD TS-30 minutes flat! This,coincidentally,was the same moments experienced on our return journey. mechanic who, with a sandwich in one hand and First, the motorhome smelled like a bakery — for •HITCH WEIGHT borrowed tools in the other, asked me to park my weeks! Second, the floor of the motorhome was •RUN ON motorhome outside his LOF bay so the CV joint startlingly close to the ground at the entrance

•OIL DILUTION could be replaced.With considerable mental reser- door.Third, on the way to the “cockpit,”I was vation, I complied.The CV joint was installed, the reminded of numerous uphill treks to the “office” •SOOTY VENTS sandwich consumed, a soda swallowed and the of a Douglas DC-3 aircraft. Forward vision was wheel jack removed all during lunch break! now well above the horizon, and the rear-view TIME TO RENEW Fortunate survivors of World War II came home mirror revealed approximately sixteen square feet instilled with a deep sense of discipline, cama- of parking-lot asphalt. CLASSIFIED raderie and need for recognition.To fulfill this There was a slight rise at the access of our busy ADVERTISEMENTS need, practically every fire department in the highway.At an opportune moment, we expedited nation found an excuse for uniformed members PUBLICATION our entrance into traffic, and burned rubber for to engage in parade competition with other fire fifty yards before the front wheels finally settled to ORDER FORMS companies. Musicians, not unlike Presidents, are Continued on Page 12 Page 2

GMC Motorhome News WHAT’S NEW is published quarterly by Cinnabar Engineer- The 3.42 final drive began shipping in July almost shops will not spend the money to get it right. ing, Inc., 116 Orval Street, Sandusky, 20 years after Oldsmobile engineers designed it The 3.42 final drive carries a 12-month, 12,000- Michigan 48471. for the GMC Motorhome.The original 3.07 final mile limited warranty for normal applications. TEL 810-648-2444 drive was the trailering final drive for the Olds- Here are reports from three regional users: FAX 810-648-9858 mobile Toronado passenger car, and it has always [email protected] Copyright 1995 by been considered too high (too low numerically) ncreasing the GMC Motorhome engine speed to more Cinnabar Engineering, and too vulnerable for the GMC Motorhome. Iclosely approximate its originally designed engine Inc.All rights reserved. The 3.42 final drive was designed for the motor- speed provides improved acceleration and hill-climbing Permission to reprint or quote excerpts home’s tire size, frontal area and anticipated tow- ability.This has been accomplished by changing the gear granted only upon ing loads. For these reasons, it is a broader-tooth ratio between the engine and the drive wheels, commonly written request and design than the original 3.07 final drive, which referred to as the final-drive ratio. Originally,the gear then only when full has a 14-tooth pinion and a 43-tooth ring gear. ratio was 3.07:1, which means the engine turns 3.07 credit is given source. Subscription price The 3.42 final drive has a 12-tooth pinion and times faster than the driving wheels. Changing this ratio United States, Canada a 41-tooth ring gear. Its design makes the ring and Continued on Page 14 and Mexico: $10.00 pinion teeth as large as possible to withstand per year.All other countries add $8.00 higher motorhome loads.This is the only way to per year. First Class or numerically increase the ratio and the load carry- GMC MOTORHOME Air Mail postage paid ing capability of the final drive, because its physi- at Sandusky,MI 48471 cal size is fixed. If a GMC Motorhome final drive TELEPHONE NUMBERS & and at other mailing offices. had been designed from scratch, it would have USINESS OURS been larger like the third member (differential) in B H Wes Caughlan a motorhome chassis of similar gross vehicle Editorial Director weight rating (gvwr). 800-GMC-TRUCK (800-462-8782) Lisa Yanagihara The 3.42 ring and pinion gears are manufac- for Recall assistance and general information Art Director tured by Ohio-Richmond Gear, which is the on GMC products. largest supplier of aftermarket, third-member Monday through Friday Lorraine Graham 8:00 a.m. to 5:00 p.m. Eastern time. Advertising gears in the world. Since General Motors no longer cuts gears, it uses Ohio-Richmond Gear 800-720-CBAR (800-720-2227) Walt Sener to manufacture all of the special gear sets for the for Genuine GMC Motorhome Parts and Contributor GMC Motorsports program, and that’s why the GMC Motorhome Operating and Service company is making the 3.42 gears. Mad Macs Publications. Graphic Consultants The 3.42 gear manufacturing was directed by Monday through Friday John Bachelder who developed third-member GMC Motorhome News 8:00 a.m. to 5:00 p.m. Eastern time. does not knowingly gears for Oldsmobile when the 3.07 (E-car) final accept deceptive or drives were made.The 3.42 final-drive assembly 810-648-2444 misleading advertising was supervised by Art Haas who was the general for GMC Motorhome Service. or editorial material. foreman of Oldsmobile’s third-member assembly Monday through Friday If you have a contrary experience with in the 1970s and 1980s. Both of these men are 8:00 a.m. to 5:00 p.m. Eastern time. respect to anything retired from Oldsmobile, and they joined herein, please contact Cinnabar Engineering, Inc. to oversee the 3.42 810-648-9858 Cinnabar Engineering, final-drive program.Working under Cinnabar for GMC Motorhome FAX and Voice Mail. Inc. immediately. Engineering’s license agreement with General Any day at any time. The GM Emblem, the Motors, Duane McCormack found the original [email protected] GMC Emblem and drawings and coordinated the program in his the GMC Motorhome for GMC Motorhome E-Mail. Parts Emblem are retirement from Oldsmobile engineering. Any day at any time on the Internet. trademarks of General The 3.42 final drive is sold only as an assembled Motors Corporation unit, because very few shops have the E-car tools 231-258-4117 and used under license that are needed to properly assemble one. Fur- for GMC Motorhome Technical Assistance. to Cinnabar Engineer- ing, Inc. thermore, there are more than 60 shim variables Monday through Friday that require substantial investment, and most 9:00 a.m. to 5:00 p.m. Eastern time. Page 3

shadow of the Golden Gate Bridge in COLORING BOOK San Francisco, and on to Old Faithful in The holidays are coming and Cinnabar Yellowstone National Park. Sun Valley, Engineering, Inc. has just the gift for the Idaho, Mount Rushmore, Sequoia children in your family,both big and National Park, Baraboo,Wisconsin, small. It is the GMC Motorhome Vacation- Williamsburg,Virginia, Philadelphia, land Coloring Book. It was first printed and Pennsylvania, distributed when the motorhome was introduced in 1973. When Cinnabar Engineering agreed to put all GMC Motorhome publications back into distribution in 1986, the coloring book was considered very interesting, but not essential.The Operating and Maintenance Man- uals had the highest priority,the Parts Book came next, the Service Bulletins and the Recall Campaigns came after that, and the Maintenance Schedule completed the list of essential service publications. Once these publications were completed, our Art Director, Lisa Yanagihara, couldn’t resist the coloring book. It is a work of art.The line draw- Niagara Falls, ings wait to be filled in with and the Maine coast are other the colors of the rainbow, destinations pictured. It concludes with and they will warm the hearts of children dinner and bedtime in the GMC of all ages. Motorhome. The colorful book contains 16 pages The coloring book is available for of drawings featuring the GMC Motor- $6.00 plus applicable tax and shipping home.A mother bear and her cub beg for charges.An order form appears on page food from the motorhome in Glacier 15 with the subscription renewal form National Park. It appears at a Taos,New for GMC Motorhome News. Any number Mexico pueblo and at the Alamo in San of coloring books can be ordered. If you Antonio,Texas.The motorhome takes its have more than one child in your family, family to a marshmallow roast in the one will not be enough.

GMC Motorhome News … September 1995 Page 4

Roundtrip airline tickets with distant The mechanical shop is now staffed SANDUSKY SERVICE departure dates are very reasonable and with four certified mechanics, headed by On September 1, 1995, Cinnabar Engi- periodically on sale. Eric Priemer who is a certified master neering, Inc. celebrated its second During the past two years the exterior mechanic.A GMC Motorhome doesn’t anniversary of consolidated operation in group has developed a number of new always have to come to Sandusky to get Sandusky,Michigan. During that two- paint designs that adapt to many different our expert mechanical attention. Increas- year period, a lot has happened. Employ- color schemes.The interior group works ing numbers of GMC Motorhome own- ment has increased to 18; thirteen work with these colors to come up with com- ers are having their local mechanics in Sandusky and 5 work elsewhere. More plementary furnishings that usually remove their front hubs every 25,000 than 900 new GMC Motorhome Part include matching leathers, hard- miles and ship them to Sandusky Numbers and countless used GMC woods, headliners where the mechanical shop has the Motorhome Part Numbers are in an special tools to remove the front- inventory that totals more wheel bearings and replace them than 200,000 parts.A 5- with the heavy-duty and properly- workstation computer spaced GMC Motorhome bear- system has been installed ings, which are part number to keep track of more than 12351677. Longer GMC Motor- 7000 GMC Motorhome home wheel studs for Alcoa alu- owners and 6900 GMC minum wheels can be installed Motorhome part numbers at the same time. listed in the 78Z Parts Book. Other GMC Motorhome Three 25,000-pound lifts owners are strapping their rear with 12,000-pound rolling tandem-axle assemblies to a jacks have been installed along pallet and shipping them to with a 6-wheel alignment Sandusky to have them station and engine diagnostic straightened and have the equipment.The cabinet shop has pins and bushings replaced. been enlarged, and the body and When they are returned, all paint shop has been upgraded to the local mechanic has to modern clean-air and industrial do is reinstall them and safety standards. shim them for proper All of this has been done to bet- camber and toe align- ter serve GMC Motorhome owners ment in accordance with worldwide under our license agree- instructions and specifi- ment with General Motors Corpora- cations in Maintenance tion.The winter months are often the Manual X-7525. time to get major mechanical, interior We also have a spe- and exterior work performed. Service cial truck and trailer Manager, Ivan Henderson, welcomes combination that was customers from all over North America. built to retrieve a wrecked or disabled They bring their GMC Motorhomes to and valanced GMC Motorhome.We can send it to get Sandusky during the off season, and we day/night blinds, which are only your motorhome, but the various emer- drive their owners to the Detroit Metro- found elsewhere in high-line motor- gency road services will generally cost politan International Airport.When the homes. New appliances, air conditioners, less. However, many of them will not be work on the motorhomes is completed, water heaters, furnaces and the most willing to deliver your GMC Motor- we store them inside and pick up their sophisticated gadgets abound.The latest home to Sandusky. owners at the airport when they can stereo and CD players are available as are Everyone at Cinnabar Engineering, conveniently return. Owners from the the new small digital satellite dishes that Inc. is proud of our Sandusky,Michigan east and west consider the trips to San- can be roof mounted along with anten- facility.We hope you will come and visit dusky a vacation, because they only have nas for a cellular telephone and the usual and bring your GMC Motorhome. If to drive one way each time, and they can CB and AM/FM radios. For those inter- you can’t bring your motorhome, just often travel a different route coming and ested in shopping at home before coming give us a call.We’ll pick you up at the going. Check with your travel agent. to Sandusky,photo portfolios can be sent. airport or at the side of the road. Coach Talk Page 5 C by Wes Caughlan

but they can’t keep up with it in hot tion. Earlier GMC Motorhomes did not Sewer Odor weather and they don’t work at all in have a “throttle kicker,”and I can under- While we were visiting in Wisconsin this sum- cold weather because the bugs go to stand why you disconnected it on your mer the outdoor temperature soared to 113 sleep! Thetford’s original Aqua-Kem motorhome. degrees F.I had a new holding tank installed chemical seems to do the best job mask- Other 1977 and 1978 GMC Motor- in my 1977 Kingsley earlier this year, and we ing holding-tank odor, and I have tried home owners with 403-cid engines may experienced considerable sewer odor in the just about everything in the market. want to disconnect their throttle kicker. motorhome when driving in hot weather. Liquid Aqua-Kem can be messy,and it If the motorhome is registered in a state We did everything possible to keep the inte- will often stain white plastic parts that are that periodically inspects emission con- rior of the coach cool, including driving with commonly found in GMC Motorhome trols, those who disable the TLA should the driver- and passenger-side windows open. bathrooms. Granular Dri-Kem is a bit make sure that the ball bearing or other Even though we used holding-tank chemicals, more expensive, but it is a lot easier to plug is removed before the next smog we could not get rid of the sewer odor. It was use and does not make a mess. Simply inspection. particularly noticeable in the galley area. open the packet, step on the toilet-flush Do you think my new holding tank is leak- pedal and dump the granules into the ing sewer gas into the motorhome? Can you open hole. One packet will keep a GMC Oil Consumption suggest a holding-tank chemical that will at Motorhome holding tank smelling pleas- My 1976 Birchaven hasn’t been used a lot least mask this odor? ant in all but the hottest weather.When since I purchased it in 1988 with 50,000 Frank Walton the weather is really hot, two packets per miles on the odometer. It now has only Rochester, Minnesota tank will generally do the job. 70,000 miles on it.The 455-cid engine always starts easily,and it runs great. doubt if your new holding tank is Throttle Kicker However, I have been getting only about Ileaking sewer gas, Frank.The three 500 miles per quart of oil during relatively roof-top vents on your 1977 Kingsley The second paragraph on page 6T-8 of easy flat-land driving.The engine does not do a more than adequate job of venting Maintenance Manual Supplement X-7725 seem to be burning oil because there is no blue the holding tank. describes the action of the Throttle Lever smoke.There seems to be some oil-pan wetness Hot weather causes more sewer gas to Actuator (TLA).The TLA prevents 403-cid around the pan gasket, which appears to be be generated, and driving with the dri- engines from going to idle in the deceleration factory original. ver- and passenger-side windows open mode.This reduces brake life and makes the A mechanic suggested that I replace the pan creates a partial vacuum in the motor- motorhome more difficult to stop. gasket, and consider renewing the valve-stem home.This in turn causes sewer gas to Many years ago I disconnected the TLA on seals. Both of these are onerous tasks which I flow down the refrigerator vent and my 1978 Palm Beach. Handling improved am reluctant to undertake if there are other make the coach stink inside, particularly when decelerating, particularly when shifting things I ought to check out first. I would in the galley area. down. I think every GMC Motorhome appreciate your comments on 455-cid engine The primary cure is to keep all side equipped with a 403-cid engine should have oil consumption that I may be overlooking. windows closed, and the HVAC blower the TLA disconnected.A small ball bearing Al Schwarz on high.This will keep sewer gas and inserted in the vacuum line will do the job. via the Internet road dust out by partially pressurizing the Roy Reitter inside of the motorhome. I experienced Manchester, Missouri our oil consumption is a bit on the the same problem with my new 1976 Yhigh side,Al, but it is not unusual. Glenbrook in the summer of 1976.A call he TLA on the motorhome has a When my GMC Motorhome was brand to GMC Motorhome Technical Assis- Tpassenger-car origin, Roy.Both the new,it used a quart of oil every 800 to tance got me this answer, and it solved 455- and 403-cid engines were certified 900 miles. Now,it is using a quart of oil the problem. Federally and in California as passenger- every 600 to 700 miles with 78,000 miles As far as holding-tank chemicals are car engines.As a result, the GMC on the odometer. concerned, only formaldehyde-based Motorhome has the same emission-con- Engine-oil mileage goes down as vehi- chemicals will mask holding-tank odor. trol devices as the Oldsmobile Toronado cle weight goes up.There is a chart in the The supposedly more environmentally with the exception of an EGR valve. Chevrolet Motorhome Chassis Service Guide sensitive enzyme chemicals mute hold- The TLA makes braking more diffi- that shows acceptable oil consumption as ing-tank odors by digesting the waste, cult, and it reduces downhill decelera- a function of gas mileage, which also

GMC Motorhome News … September 1995 Page 6

1 goes down as vehicle weight goes up. entire tire. Keeping the motorhome as simple.A ⁄4-inch, female-pipe opening The minimum acceptable oil con- engine running or boosting the battery must be created to install the quick cou- 1 sumption for an engine getting 7.5 miles to allow the converter to keep the volt- pler. Replacing the ⁄4-inch street elbow per gallon of gasoline is 500 miles per age up at the compressor will expedite that connects the air tank to the Electro 1 quart of oil. Marginal oil consumption the process. Level I manifold with a ⁄4-inch male- goes down to 250 miles per quart of oil If you go back to the 1980 articles, you branch tee is the easiest, and it makes the at 7.5 miles per gallon of gasoline. How- will notice there is a brass quick coupler quick coupler readily accessible. ever, marginal oil consumption is usually attached to the air tank in the pictures. Alternatively,you can attach a clip-on caused by external leaks, a malfunction- This is the way you get the air out of air chuck to the Schrader valve at the ing PCV system or missing, worn or mis- 1973 through early 1976 Power Level bottom of the air tank, but it often sup- located valve-stem seals. air-suspension control systems. Simply plies rusty water and debris along with At 70,000 miles, your oil consumption plug in an air hose with an attached infla- the air.As a result, the Schrader valve is a bit on the high side, but I would not tor, start the motorhome engine or boost should only be used as a drain and then worry about it too much.Your valve- the engine battery to keep the voltage sealed with a pressure-sealing valve cap. stem seals are worn, but probably not up, and go for it! Once the quick coupler is installed, the enough to justify a valve job. If possible, Getting the air out of an Electro Level Electro Level I procedure is the same as fix or slow down any leaks and keep an I air-suspension control system is almost the Power Level procedure with a couple eye on your consumption. If it stays of exceptions.Turn around 500 miles per quart, and the the ignition on or to engine runs as well as you say,don’t the accessory posi- worry about it. I would rather have an tion. In addition to engine that uses a bit too much oil than starting the motor- one that doesn’t use any oil at all. home engine or boosting the engine battery to keep the Quick Coupler voltage up, the I recently acquired a 1977 Royale, and had motorhome should problems with the air suspension.After reading be at normal ride copies of your preventive maintenance articles height and the cen- that were published in 1980, I upgraded my ter control switch Electro Level I air-suspension control system. should be put in the The air suspension now works better than I Travel Auto posi- had imagined, and campsite leveling is a joy. tion.The compres- If the air-suspension control system can sor will only operate pump up two air bags and keep them properly in this position and inflated, why can’t it pump up a tire or other not change normal inflatable things like a basket ball? Also, I ride height. If the have a large compressor in my work shop. motorhome is not at Why can’t I turn off the little, twin-cylinder normal ride height, compressor and use my shop air when the the system will motorhome is parked near my shop? adjust the air sus- Warren Baldwin pension to normal Nashville,Tennessee ride height at the same time it is being ou can do both,Warren. Let’s take used as an inflator. Ythem one at a time.The twin cylin- Using an Electro der compressor will pump up a tire if Level II system to you let it do so in stages. Pumping up a supply air is not as GMC Motorhome tire to 75 psi is like easy,because there is pumping up a whole bunch of air bags. It An upgraded Electro Level I module with a quick coupler, no air-storage tank will easily top off all of your tires without copper air-cooling loop, stainless-steel check valve, 5-micron and the little com- a rest, but it should be allowed to rest and filter, pressure-relief valve, pressure gauge and brass air-brake pressors do not cool once or twice when pumping up an fittings.A dual-foot inflator is attached to a 25-foot air hose. pump a lot of air. Page 7

compressor will start and attempt to pick to a certified facility to get it done. In addition, up the inflation chore. the Freon has become very expensive. By creating a double-nipple adapter What will I do next year to top off my 1 1 from a ⁄4-inch male and a ⁄4-inch female system? Is there a replacement gas? Or, will nipple, air can be added to Power Level I have to install a new dashboard air-condi- and Electro Level I air-suspension con- tioning system? trol systems from an external source, such Jerry Sanders as your shop compressor. Since Power Omaha, Nebraska Level systems do not require the ignition switch to be turned on or to the accesso- or the next couple of years, Jerry,you ry position to operate the valves, simply Fwill be able to continue as in the past. plug the shop air into the air tank and set While Freon (R12) cannot be manufac- the dashboard controls. tured after the first of the year, most ser- Electro Level I systems can be operated vice-oriented companies have been similarly with two exceptions.The igni- stockpiling it. General Motors has advised A clip-on chuck can be used to access an tion switch must be turned on or to the Cinnabar Engineering, Inc. that it will be Electro Level II system. accessory position, and the twin-cylinder able to supply R12 for at least 2 more compressor must be turned off.Turning years. However, it must be installed by a One of the compressors can be used to the compressor off can be as simple as certified facility that has recovery equip- supply air by attaching a clip-on chuck to unplugging its red lead from the wiring ment, and the gas itself has become rela- the Schrader valve in its head, turning the harness. However, that may be easier said tively expensive. ignition on or to the accessory position, than done, because the connection may A new refrigerant called R134A has starting the motorhome engine or boost- not be readily accessible.The easiest way been installed in new vehicles for the past ing the engine battery to keep the volt- to turn an Electro Level I compressor off few years. Initially it was not as efficient age up, and switching the center control while using shop air is to install a pressure as R12, but component redesign has just switch to the Travel Auto position when switch that has a manual switching lever. about eliminated performance differ- the motorhome is at normal ride height. Furnas makes such a switch, and it is ences. Unfortunately,R134A is not com- Initially,air will come from the air bag available from Grainger outlets through- patible with the mineral oil used in an that the compressor normally supplies. out the U. S. It is Grainger no. 4A088, R12 system, and the entire system should When the height control sensor detects a which is Furnas part no. 69MB7L. be replaced to avoid contamination and lowering ride height on that side, the Adding air to an Electro Level II sys- provide proper containment. tem is also quite simple.A clip-on chuck Replacing the entire GMC Motor- at the end of a shop-air hose is attached home dashboard air-conditioning system to the Schrader valve on one or the other is not as bad as it may sound, because all Electro Level II compressors. Like Electro of the systems are getting up in years. Level I, the ignition switch must be Air-conditioning compressor and other turned on or to the accessory position, component replacement is common, and and the compressor must be turned off. changing to an R134A system at that The best way to turn an Electro Level II time should save money in the long run. compressor off is to unplug it. Alternatively,new gases are coming into the market that are compatible with the R12 mineral oil, but all of these gases Refrigerant Choice require new connection fittings and con- According to my local mechanic, Freon (R12) tainment hoses.They cannot be used to can no longer be manufactured after the end of top off an R12 system like you have been this year. It is the refrigerant that was used in doing in the past, but they can be used to all GMC Motorhome dashboard air-condi- replace R12, which can be removed from tioning systems. the system. Every spring, I have to top off my air con- The first new gas approved by the ditioning system when I prepare my 1976 Environmental Protection Agency (EPA) Male and female couplers and nipples Eleganza II for the season. Up until a year or is called Frigc. It was recently covered by make connections easy.Air can be added so ago, I purchased little 12-ounce containers U. S. Patent 5,425,890, and it is manufac- with a double-nipple adapter. of Freon and did it myself. Now,I have to go tured by Intermagnetics General of Lath-

GMC Motorhome News … September 1995 Page 8

am, New York.Another new gas is sible location, but that wouldn’t be cheap. R406a, which is covered by U. S. Patents Recently,a friend came to visit in a 1994 5,151,207 and 5,214,929.According to Holiday Rambler motorhome that had a simi- its manufacturer, Monroe Air Tech Incor- lar 30-amp shore-power cord. Even though his porated of Bloomington, Indiana, R406a motorhome was plugged into only a 15-amp is more efficient than R12, and it will be outlet at my home with an adapter, he could available for automotive air conditioning run both air conditioners and all other 120- systems in early 1996. volt AC appliances by simply starting his 6.5 At the moment, Frigc is considerably kw auxiliary generator.When he unplugged, more expensive than R12 or R134a. the same was true and he didn’t have to However, now that the patent has issued, change any of the circuit-breaker switches. the manufacturer says large-scale manu- How does a 1994 Holiday Rambler facturing should bring the price down. motorhome completely switch to generator Even if the cost is higher, Frigc or R406a power automatically? How can I make my may be the most economical alternatives 1978 Royale do likewise? once R12 supplies are exhausted. Frigc is Ken Parks The Todd TS-30 has a 20- to 30-second currently selling for around $25.00 a Tulsa,Oklahoma time delay to let the generator warm up. pound, and a GMC Motorhome takes 3 to 4 pounds.The material cost to change oliday Rambler does it with a ers in your Royale, and you will not have a GMC Motorhome dashboard air-con- Htransfer switch, Ken. In fact, almost to fold up the bed to have 120-volt AC ditioning system from R12 to Frigc all new motorhomes use transfer switches power whenever you want it. should not exceed $100.00. Considering that are made automatic with solid-state Most Royales with two air condition- that R134a retrofit parts will cost more electronics that did not exist in 1978. ers have two circuit-breaker panels.The than those for Frigc or R406a, these There are several automatic transfer Onan generator supplies one panel that alternative gases may become one of the switches in the market.Todd Engineer- has a 20-amp breaker for the rear air con- better bargains in the market. ing’s TS-30 can eliminate the two break- ditioner and a 40-amp breaker that sup- For the time being, I would just sit and plies a neutral-switching, 30-amp main watch.The retrofit market has not devel- breaker in the second panel.A second oped because R12 is still available.As its neutral-switching, 30-amp main breaker availability declines, more alternatives in the second panel is supplied by the may appear. shore-power cord.The flipper on one of these breakers prevents them from being turned on simultaneously. Transfer Switch The second panel has 15- and 20-amp I have a 1978 Royale that has 2 roof air con- branch breakers.They supply the front air ditioners and a microwave oven.The 120-volt conditioner, the microwave oven and the AC shore-power cord is rated at 30 amps. 120-volt AC receptacles.This panel is When I am hooked up in a campground, I basically a 30-amp panel, and it needs can run the front air conditioner and the only one 30-amp main breaker.A trans- microwave. If I want to run the rear air condi- fer switch can supply the main breaker tioner, I have to start the Onan generator. with either generator or shore power, When I leave the campground, I can only eliminating the need for the second main run the rear air conditioner when I start the breaker and the flipper. generator. No other 120-volt AC circuit is A Todd TS-30 transfer switch costs active unless I fold up the bed, remove an about $75.00, and it is easy to install. upholstered panel, and turn the shore-power Simply choose one 30-amp breaker as breaker off and the generator breaker on.There the main breaker and abandon the other. is a flipper on one of these breakers that won’t Remove the generator wires from one let me turn them both on at the same time. I 30-amp breaker and attach them to the suspect that is to prevent one circuit from feed- A Royale 30-amp, 120-volt AC panel generator input terminals on the transfer ing back into the other. with two main breakers and a flipper.The switch. Remove the shore-power wires I have thought about having an electrician breaker with the flipper can be eliminated from the other 30-amp breaker and move the circuit-breaker panel to a more acces- with an automatic transfer switch. attach them to the shore-power input Page 9

generator.After a 20- to 30-second time would transfer weight from the front to delay all 120-volt AC circuits should be the rear and partially unload your front active, including the rear air conditioner. axle, which is already too light to main- Shut down the Onan and the transfer tain really good traction.The end result switch will turn off all AC power. Plug would be overloaded rear tires and the shore-power cord back into the 120- wheels, and lousy steering and stability. volt AC receptacle, and AC power will be The Chevrolet Motorhome Chassis Service restored to everything but the rear air Guide gives the formulas for calculating conditioner. Now,start the Onan with- the weight transfer. Let’s take a look. out unplugging the shore-power cord. Your 1976 Royale has a 160-inch Again, after a 20- to 30-second time wheelbase, and your 400-pound motor- delay all 120-volt AC circuits should be cycle will be about 120 inches behind active, including the rear air conditioner. the center of the rear axle. Since 120 is Even though the shore-power cord is still 75 percent of 160, your rear axle weight plugged in, all 120-volt AC power will will increase by 400 pounds plus 75 per- be coming from the generator.When the cent of 400 pounds (300 pounds), which transfer switch switches from shore totals 700 pounds! Your front axle load power to generator power there will be a will decrease by 300 pounds, which will momentary power interruption.That simply exacerbate the GMC Motor- tells you there will be no feedback in home’s inherent front-traction problem. I either direction. call this the teeter-totter effect. One word of caution. Even though a We have long said that hitch weight on The transfer switch switches both the hot time-delay transfer switch is controlling a GMC Motorhome should not exceed and the neutral circuits.The pigtails are 120-volt AC power, do not start or stop 100 pounds. If it does, a load-equalizing for the generator connection. the Onan generator with any 120-volt hitch is necessary to maintain stability.In AC appliance turned on. Make sure that addition, any added weight should be terminals on the transfer switch. Before all AC appliances are turned off before braked, and that has become quite an making these connections, make sure the starting or stopping the generator to pre- issue in the motorhome industry today.If neutral wires are attached to the neutral vent variable voltage problems. you put your motorcycle on a trailer, the terminals and the hot wires to the hot trailer can have brakes.A braked trailer terminals.Then, run a pair of 10 AWG will probably have less than 100 pounds wires from the output of the transfer Hitch Weight of hitch weight, and you and your Harley switch to the chosen 30-amp main I recently bought a 1976 Royale, and just had will be happy campers! breaker. Finally,ground the transfer a set of 8.75R16.5 LRE Michelin XPS tires switch by attaching a length of chassis- installed on it. I also own a Harley-Davidson grounded 8 AWG copper wire to the motorcycle. Can I hang a 400-pound Harley Run On ground bar in the box. on the back of my GMC Motorhome without I had the carburetor remanufactured on my The generator will now supply the rear compromising anything? 1976 Palm Beach early this summer.After air conditioner and the transfer switch. Irving “RJ” Mace getting it back, I started experiencing run on The shore-power cord will supply the Ware, Massachusetts when I shut the 455-cid engine down with transfer switch which defaults to shore the transmission in Park. power. It will automatically switch to ou can hang anything you want on The motorhome has 106,000 miles on it, generator power after a 20- to 30-second Ythe back of your GMC Motor- but otherwise it runs great.What is causing the time delay when the solid-state electron- home, RJ, but your new Michelin rear run on and what can be done to stop it? ics detect 120 volts AC at the generator tires and you won’t like a 400-pound John Schwietert terminals.The time delay allows the gen- motorcycle back there.Why? The answer Rapid City,South Dakota erator time to warm up. is quite simple. After installing the transfer switch, plug The rear bumper is almost 9 feet number of things cause run on, the shore-power cord into a 30-amp, behind the center of the tandem axle, and AJohn. Since the ignition is off, some- 120-volt AC receptacle.With the excep- the center of a motorcycle rack would be thing has to cause ignition. In an older tion of the rear air conditioner, all 120- about 10 feet back.A 400-pound motor- engine it is usually hot carbon deposits in volt AC circuits should be active. Unplug cycle would put more than a 4000 foot- the engine, and your engine qualifies in the shore-power cord and start the Onan pound lever on the rear axle.This in turn that regard.

GMC Motorhome News … September 1995 Page 10

Vaporized fuel and air also must be the engine is shut down when the trans- carburetor is installed on the engine.The present to sustain run on.Today’s refor- mission is in Drive or Reverse, the load adjustment procedures are described in mulated gasolines, which vary in volatili- will usually prevent run on under these maintenance manual X-7525. If the final ty,and hot summer weather are often all circumstances. adjustments have not been made, the car- it takes to keep some vaporized fuel When your carburetor was remanufac- buretor may be contributing to the prob- flowing into the engine after shut down. tured, the idle-mixture and slow-idle lem with an overly rich idle mixture or When the transmission is in Park, very adjustments were arbitrarily set. Final an improper throttle-valve position. little fuel is required to sustain run on. If adjustments cannot be made until the Oil Dilution Thank God for the return of intelligent com- mentary on GMC Motorhome problems! I have incurred a problem and need your help. On my last trip I noticed that my crankcase had about 4 quarts more oil in it when I returned than when I left town. I immediately assumed that the fuel pump was leaking and replaced it. On a try-out run of several miles, I again found that my oil was contaminated with gasoline. What is causing this dilution? How can it be stopped? Milton Kielsmeier Forestville, California

our carburetor is dumping gasoline Yinto your engine, Milt.This can se- riously damage the engine because it washes down cylinder-wall lubrication. If your fuel delivery system is working properly and has not been modified with an auxiliary electric fuel pump, the cause is the float valve in the carburetor. It is similar to the float valve in a toilet. Either the float is saturated with gasoline and not rising in the bowl, or the valve is sticking open. Both conditions are easy to fix during a minor carburetor overhaul. However, check the fuel pressure at the OEM fuel pump first. It should not exceed 5 psi at the inlet when the engine is idling. If it does, excessive pressure may be forcing the float valve open, causing the carburetor bowl to become overfilled. This will allow gasoline to overflow into the engine. Excessive fuel-pump-inlet pressure can be caused by unregulated, auxiliary electric fuel pumps that are pressure additive, such as an AC EP12S or an AC EP89.A plugged liquid/vapor separator or carbon canister also can cause excessive fuel- pump inlet pressure, particularly when a Page 11

bad gas cap does not relieve fuel-tank that is your problem assuming your new For some reason they rarely block a com- pressure between 2 and 3 psi in accor- regulator is delivering 10.5 to 11 inches bustion-air passage completely so the dance with specifications. water-column pressure to the affected appliance works, but it soots badly. appliances. The combustion-air tube on most Strong fumes from the stove burners water heaters is relatively easy to clean Sooty Vents are a clue, because that indicates a build- with a bottle brush and other small tools Recently,both the water heater and the furnace up of odor agent in your propane tank. that are usually necessary to break the vents have been turning a deep black on my The odor agent is a “perfume” that is insect nests loose. Cleaning the combus- 1977 Royale. I cleaned both burners and had mixed with propane to give it a smell, tion-air passages in a furnace is another the regulator tested by a gas company.The and it is slightly heavier than propane. matter.The furnace usually has to be technician told me that the pressure was too Over the years perfume builds up in the removed from the motorhome and dis- low,so I purchased a new regulator and had bottom of any propane tank, and it can assembled.This work is generally best the pressure set. create quite a stink in a motorhome, par- performed by a service center for the I blew out all of the burners with compressed ticularly when the tank is close to being particular furnace. air and still have the problem.There are also empty.To get rid of the smell, have a strong fumes from the stove burners. Please tell knowledgeable LP-gas service facility Wes Caughlan is President of Cinnabar Engi- me what I can do to eliminate this problem. drain the tank and then pressure purge neering, Inc. Cinnabar Engineering, Inc. is General Motors’ licensee for the distribution of George McManus the tank with propane vapor to eliminate all GMC Motorhome Parts and Publications. Peoria, Illinois introduced air. Address correspondence to 10836 West Loyola More importantly,this perfume attracts Drive, Los Altos Hills, California 94024; ormally,sooty deposits on exhaust insects. Mud dauber insects are the most E-Mail [email protected] on the Internet; vents indicate too much LP-gas common.These pesky rascals crawl into FAX 415-948-6263.Telephone 415-948- N 8664 Monday through Friday 8:30 a.m.- pressure, George.They also can indicate combustion-air vents and build nests that 5:30 p.m. Pacific Time. insufficient combustion air, and I suspect substantially reduce combustion-air flow.

GMC Motorhome News … September 1995 Page 12

Continued from Page 1 remarked how high the rear of the the road surface.What amazing power! motorhome seemed to ride, minus all TIME TO RENEW The ol’ Glenbrook felt like a big boat out those pies.To me, it seemed once again For most subscribers, September 1995 is of water. to be the inimitable GMC Motorhome. the month to renew their subscription to One sneaky way to encourage audi- On the way home, by a majority vote, GMC Motorhome News.Your renewal ence attendance at summer-in-the-park we were coerced into a circuitous detour month and year follow your name on the events is to wait until after the band con- by way of the local ice-cream emporium. envelope that brought you this issue. cert to distribute 1088 pounds of mouth- Six 10.7-ounce sections of Shoofly pie The subscription price is still only watering Shoofly pies.With each carton were smothered with ice cream and $10.00 per year for First Class Mail sub- removed from the motorhome, there served. Pete insisted this action was essen- scriptions sent to addresses in the United would be a disconcerting hiss of air from tial to stabilize our motorhome’s center States, Canada and Mexico. Subscribers the height-control valves.The ladies were of gravity by four pie pounds. Under the in other countries should add $8.00 per not impressed with the strange hissing circumstances, who in the world could year to cover Airmail charges. sound. Someone even suggested that it turn down Shoofly pie a la mode served A subscription renewal form appears sounded like a mechanical sigh of relief. by Pete The Pieperson. on page 15. It can be used or copied and Ol’ Glenbrook even hissed at our returned with your check made out to mailperson when she bounced by with Walt Sener has played the trumpet since Cinnabar Engineering, Inc.To save the a blond pony tail and really short, short 1929, had a newspaper route and was a gym- annual nuisance and paperwork, consider nast of note. He retired after 37 years with the shorts.That hiss to me seemed to be Department of Defense and has been writing renewing for two or more years and more a hiss of delight than anything else. anecdotes about the GMC Motorhome since guard against any future increase in the Pete, now known as the pieperson, the 1970s. price of a subscription.

At Winterfeldt . . . We Build Custom and Standard Engines for GMC Motorhomes. We Can Bring Them To You.

Call us with your requirements. interfeldt W5468 GUNBARREL ROAD, LONGMONT, COLORADO 80503 • PHONE (303) 530-4995 Page 13

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1977 Royale 26-foot,Rear Bath. 1976 Birchaven 23-foot, Rear Bath. Motorhomes For Sale 73,500 Original Miles. Upgraded Air 78,000 Original Miles. New Paint and 1978 Royale 26-foot,Rear Bath. Suspension, 455-cid Engine. New Front Interior. Microwave, 4 kw Generator, CB 47,000 Original Miles. Original Owner. Shocks, Hoses,AC Condenser,Air Bags. Radio, Stereo, Roof Pod. $22,500. Dick Tub/Shower, Generator, Roof Air, Pod, Need Larger Coach.Trade for 1988+ 28- McGuire,Amarillo,TX; 806-355-8757. TV,Microwave. Sleeps 6.Whistle Clean. to 31-Foot RQB Coach, or $19,500. Smooth Riding Classic. $20,000. Frank James Lingle, Cobden, IL; 618-893-2829. 1975 Eleganza II 26-foot, Side Bath. Towle, Scottsdale,AZ; 602-860-6996. Nearly New Tires, Carpet,Two-Way 1976 Glenbrook 26-foot, Side Bath. Dometic Refrigerator, Bilstein Shocks. 1978 Eleganza II 26-foot, Side Bath. 65,000 Original Miles. New Carpet and Stored Inside. $17,000.Wayne Cramer, Full Cabinets, Microwave Oven, 6kw Drapes. Stored Inside. Excellent Condi- Bondurant,WY; 307-733-5618. Onan,TV Antenna, Roof Storage Pod, tion. $26,000. Paul Heltzel, Niles, OH; Awnings, Central Vacuum,CB Radio. 216-544-4025. 1974 26-foot, Side Bath. Non Smokers. $27,500. Bruce Smallman, 455-cid Engine, 6.5 kw Generator,Two Phoenix,AZ; 602-973-1035. 1976 Birchaven 23-foot, Rear Bath. Roof AC. Extra Engine,Transmission and 34,000 Original Miles, Sleeps 4. New 10- Final Drive. $18,500. Jerry Hudson, 1977 Eleganza II 26-foot, Side Bath. Ply Rated Radial Tires. Original Paint, Jasper,AL; 205-384-4612. New Engine with Warranty.Completely Well Maintained.$5000 in Updating, Redone Inside and Outside. New AC, Including a Screen Door.A Super Coach 1973 Custom 26-foot, Side Bath. Furnace,Water Heater,Transmission, Ready to Travel. $26,000. R. E. Monk, 90,000 Original Miles. Fuel Injected HEI Tires, Bearings, Brakes, Bilsteins. $30,000. Monticello, IA; 319-465-3346. 455-cid Engine. Gaggenau Stove, Corian Paul Kane, Mesa,AZ; 602-924-7370. Counter Tops,Awnings, Chrome Wheels, 1976 Eleganza II 26-foot, Side Bath. New Tires, Screen Door. Loaded With 1977 Royale 26-foot,Twin Beds. 56,000 Original Miles. Nevada Coach. Much More. $23,000 OBO. Gene 56,000 Original Miles. Dry Bath, 455-cid New Carpet, Full Size Rear Bed, Barrel Trester, Los Angeles, CA; 213-291-0508. Engine. New Interior, Refrigerator, Mini Chairs, Couch,Venetian Blinds.New Blinds,Valances.$23,500. Doug Laubhan, Engine,Transmission,Tires, Shocks, 3- 1973 Canyon Lands 26-foot. Woodward, OK; 405-256-7177. inch SS Exhaust. $22,500 OBO.Will 53,000 Original Miles. Completely Trade Up, Down or Sideways. Keith Rebuilt. Many Custom Items. Built-In 1977 Kingsley 26-foot, Side Bath. Rush, Las Vegas,NV; 702-361-5322. Couch, New Air Suspension,Wallace 85,000 Original Miles. Clean Inside. Hubs, Bilstein Shocks. New Appliances. New Radiator,Tires, Furnace. Spare Air 1976 Glenbrook 26-foot, Side Bath. $20, 000 OBO. Ed Harris, Columbus, Bag and Maintenance Manuals. Non- 52,000 Original Miles. Stored Inside and GA; 706-568-6759. Smokers. $22,000. John Mathison, Well Maintained.Excellent Condition. Brookings, OR; 503-469-6930. $25,000. Ruby Crispell, Norwich, NY; Advertising 607-334-8533. 1977 Birchaven 23-foot, Side Bath. Subscribers are entitled to one non- 61,000 Original Miles. 455-cid Engine. 1976 Birchaven 23-foot, Side Bath. commercial classified advertisement $10,000 in Renovations. Pleated Blinds, Rebuilt Engine and Transmission. Cus- per year at no charge.Additional non- Berber Carpet, Michelins, Bilsteins. New tom Window Decoration. Many New commercial advertisements in the same 00 Windshields. Stored Inside. Lynn Street, Parts. Records and Receipts. $15,000. year are $10 each. Commercial Young America, MN; 612-467-3375. Ron Porter, Redford, MI; 313-534-8147. Advertising Rates are available on request.Advertising should be directed 1977 Royale 26-foot, Dry Bath. 1976 Eleganza II 26-foot, Side Bath. to: Lorraine Graham, Cinnabar Engineer- Two Roof Air Conditioners, 403-cid 84,000 Original Miles. Custom Leather ing, Inc., 116 Orval Street, Sandusky, Engine.Three-Speed Roof Vent,6 kw Interior. New Refrigerator, Headliner, Michigan 48471,TEL 810-648-2445, Onan, Storage Pod, Parts Book and Carpet, Drapes. Corian Counter Tops. FAX 810-648-9858. Maintenance Manuals. Real Nice Coach. Two Roof AC. Excellent Mechanical The closing date for the December 1995 issue $22,500. Robert Duncan, Roodhouse, with Updates. See To Believe. $24,500. is November 10, 1995. IL; 217-587-2861 After 6:00 P.M. R. B. King, Florence, SC; 800-467-5464.

GMC Motorhome News … September 1995 Page 14

Continued from Page 2 hour and 3 inches of mercury vacuum with the original to 3.42:1 increases the engine speed to approximately 3.07 final drive.With the 3.42 final drive, the motor- the same revolutions per minute (rpm) it turns in an home topped the hill at 49 miles per hour and 5 inches GMC Oldsmobile Toronado at the same highway speed. In of mercury vacuum. Motorhome my 1978 Palm Beach with an original 403-cid engine Starting down a 6 percent grade at 25 miles per hour and transmission, and half-worn 8.75R16.5 tires, in second gear with the 3.07 final drive, the motorhome Parts engine speed increased almost 300 rpm at normal high- reached the bottom at 50 miles per hour.With the 3.42 way speeds.At 55 miles per hour engine speed with the final drive, the motorhome reached the bottom at 43 3.07 final drive was 2100 rpm.With the 3.42 final miles per hour, which is 14 percent slower. Genuine GMC drive, engine speed increased to 2400 rpm at 55 miles The original torque and horsepower curves for the Motorhome Parts per hour, and it rose to 2800 rpm at 65 miles per hour, 455-cid engine indicate 2600 rpm is about the ideal are still manufac- which is where the engine likes to cruise. cruising speed for the engine.With the original 3.07 Road testing has demonstrated improved response final drive, the engine never reaches that speed within tured by General when accelerating to pass or when climbing a hill. If you maximum speed limits on most highways.With the Motors and its have a vacuum gauge, you will notice a higher reading at 3.42 final drive, the engine reaches 2600 rpm between suppliers. the same highway speeds.Also, the vacuum reading drops 60 and 65 miles per hour. They are no longer distributed by GM car and truck dealers. 3.42

They are dis- Power tributed by GM licensee Cinnabar Engineering, Inc. less when accelerating or climbing a hill.The higher vacu- Speedometer correction varies with tire size. Mine was um provides quicker and smoother transmission shifting corrected with a Stewart Warner adapter that is put in 116 Orval Street closely approximating that of a passenger car. From 55 to line with the speedometer cable.The correction was Sandusky, MI 65 miles per hour, the 3.42 final drive caused my engine 0.918, but I understand that other corrections range to 48471 vacuum to increase by more than 1-inch of mercury, 0.905.The cost of the adapter is about $90.00, and the which should reduce fuel consumption in the long run. correction can be made by any speedometer shop that has U.S.A. and There is a definite improvement in deceleration brak- a cable-turn counter. Canada ing such as off-ramp slowing or downhill braking.The Bob DeSaussure 800-720-CBAR improved responsiveness of the GMC Motorhome with San Rafael, California (800-720-2227) the 3.42 final drive provides better handling and passenger comfort. It gives me the feeling that I’m driving my installed the 3.42 final drive and took off on a Worldwide old 1973 Sequoia with its 455-cid engine instead of Ibusiness trip to Oregon.The motorhome was notice- 810-648-2444 my 1978 Palm Beach with its 403-cid engine! ably more responsive going up and down hills, and the Roy Reitter increased engine speed caught my attention. Worldwide Manchester, Missouri Upon returning home, I had to accompany my wife FAX/Voice Mail to Minnesota to bring back a trailer load of her mother’s 810-648-9858 f I were asked for an off-the-cuff opinion as to the belongings. Like most of us, she really loaded that trailer. Ibenefit of the 3.42 final drive, I would say approxi- My gross combination weight on the trip home was Worldwide mately a 10 percent or better performance increase could 17,000 pounds! E-Mail be expected throughout the operating range. My 1977 Even though the loaded trailer weighed in the neigh- [email protected] Palm Beach with a 455-cid engine is far from stock. It borhood of 6000 pounds, the 3.42 final drive allowed has Thorley headers, new LT225/75R16 tires and a me to maintain my usual highway speeds, which I won’t CiNNABAR number of other goodies. Nevertheless, at 65 miles per mention because they often exceed the speed limit. ENGINEERING, Inc. hour my engine speed increased from 2500 rpm with the The Eisenhower pass was topped 9 miles per hour

Motorhome 3.07 final drive to 2700 rpm with the new 3.42 final faster with the 3.42. Frankly,I tried to destroy it with Parts • Service Publications drive, and vacuum rose from 11 to 13 inches of mercury. one of my big engines, but couldn’t. GM did a great job. On a 6 percent uphill grade in third gear and at full Darrel Winterfeldt throttle, the motorhome topped the hill at 45 miles per Longmont, Colorado Page 15

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