Automatic Transmission
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SECTION 6E AUTOMATIC TRANSMISSION CONTENTS OF THIS SECTION Page Corvair-500, 700 and 900 Series ... .. .. .. ... .... ... .. ... ... ...... .. .. ...... .. .... ... .. ... 6E-l Corvair 95 and Greenbrier-1200 Series .. .. .. ... ... .. .. .. .. .... .. .. .... ... ... .. ..... .. 6E-28 INDEX Page Page General Description . .. .. .. .. ... '.' .. .. 6E-1 Disassembly of Transmission . .. 6E-ll Maintenance and Adjustments . 6E-3 Inspection and Repair of Oil Requirements. .. 6E-3 Transmission Components . .. ...... ... 6E-13 Oil Level . .. 6E-3 Front Pump . .. 6E-17 Draining and Refilling . 6E-3 Clutch Drum. .. 6E-18 Shift Linkage Adjustment. 6E-3 Planet Carrier. 6E-20 Neutral Safety Switch Adjustment . .. 6E-4 Turbine Shaft. 6E-20 Throttle Valve Linkage Adjustment. 6E-4 Pump Shaft . ... ... .... .. .. ... .. " 6E-20 Low Band Adjustment .. ...... .. ... .. 6E-5 Rear Pump and Service Operations .. .... .. .. .. ... .. .. " 6E-5 Reverse Piston Assembly . 6E-20 Service Reference Guide. .. 6E-5 Converter . .. 6E-22 Service Operations-Transmission in Vehicle . 6E-5 Range Selector Assembly. .. 6E-5 Assembly of Transmission. .. 6E-22 Control Cable Assembly. 6E-6 Front Pump Vacuum Modulator . .. .. ... " 6E-7 Thrust Washer Determination . .... 6E-24 Governor . 6E-8 Trouble Shooting . 6E-26 Valve Body and Low Servo . 6E-8 Hydraulic Pressure Data . .. 6E-26 Transmission Removal and Installation . .. " 6E-ll Diagnosis Guide. .. 6E-27 Service Operations-Power Train Specifications. .. 6E-30 Removed from Vehicle ..... .. ..... 6E-ll Special Tools . .. 6E-30 GENERAL DESCRIPTION The 1961 Corvair Powerglide incorporates the fol input sun gear to transmit converter torque to the lowing design revisions: transmission gear box. Excepting the converter location, mechanical com • Rear pump check valve now embodies an oil ponents of the "Corvair" Powerglide are generally bleed poppet to prevent air entrainment in the scaled-down versions of comparable parts in conven hydraulic circuit when operating in Reverse. tional Powerglides. The use of a plate-type reverse • The line-pressure limiting valve is deleted. clutch and a welded converter with integral starter • Facing material deleted from front face of the driven gear are obvious exceptions. Gear ratios are thick reverse clutch reaction plate. 1.82:1 in low and reverse and 1:1 in high gear. Auto matic low is also 1.82:1. • Faced plates in drive clutch now waved and Selector lever positions from top to bottom are Re steel reaction plates flat for better heat dissi verse, Neutral, Drive and Low. No Park position is pro pation. vided. Power flow sequences in each range are identi The "Corvair" Powerglide (fig. 6E-1) consists of an cal to conventional Powerglide transmissions. air cooled, three element torque converter which drives Two innovations have been added to the Low range through an automatic shift, two-speed planetary trans in this design, these being the addition of a manual low mission. inhibitor and an extended part throttle downshift. As illustrated, the Powerglide transmission is inte The manual low inhibiting feature is designed to pro grated to the differential carrier to form a Transaxle. tect the transmission from damage which could result As a result, the converter is remote from the main from moving the selector lever into Low while the transmission assembly, being separated by the differ vehicle is traveling more than approximately 45 mph. ential carrier. Two shafts run axially through the hol For example, if the driver moved the selector lever into low pinion shaft; one from the converter cover hub to "low" at 70 mph, the transmission would remain in the front pump and the other from the turbine to the "high" until vehicle speed was reduced to approxi- COIIYAIII .HO" MANUAL ,. C -4 0 ~ 28 29 30 31 32 33 I ,. ~ n -4 •'"Z U' ~ 27 U; 7_ 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 I U' ~---- (5 6, ............. ~ .......... "'-"'-'" ~,,'\. \ \ I I / / / / / I I ....'.... ~po;; - ~ Z .... 0- m I S~~k>~~~JIJ / //// / /~ t.) 4 3 2 n 0 II < ~ I 49 48 47 46 45 44 43 42 41 40 39 38 37 36 35 34 :a to % ..0 ~ ~z c ~ Fig. 6E-l-"Corvair" Powerglide-Cross Sectional View -r -- - --- - - -- --- - -- - - AUTOMATIC TRANSMISSION 6E-3 mately 45 mph, and then the downshift would occur. subsequent upshift will occur at 34-41 mph. As with Part throttle downshifts are provided to provide the conventional Powerglide, wide-open throttle down better low speed acceleration characteristics. At speeds shifts are possible with the speed limitations being below 25 mph, a downshift to Low will occur if the 38-44 mph. accelerator is moved to one-half throttle or more. The MAINTENANCE· AND ADJUSTMENTS All mating surfaces such as the front pump, oil pan OIL REQUIREMENTS rail, filler tube, governor, and the attachment to the The Powerglide transmission requires an oil known differential carrier should be carefully examined for as Automatic Transmission Fluid, "Type A" bearing a signs of leakage. The vacuum modulator must also be "AQ-ATF" mark. This oil is available through Chev checked to insure that the diaphragm has not ruptured rolet dealers and oil company filling stations in sealed as this would allow transmission oil to be drawn into containers. the intake manifold. Usually, the exhaust will be ex cessively smoky if the diaphragm ruptures due to the transmission oil added to the combustion. OIL LEVEL The transmission oil level should be checked every DRAINING AND REFILLING 1000 miles. Oil should be added only when the level is No periodic draining of the transmission oil is rec near the "ADD" mark on the dip stick with oil at ommended. normal operating temperature. The oil level dip stick When the transmission requires repair, drain the oil is located in the right-front of the engine compartment. by loosening the filler tube attaching nut in the oil NOTE: The difference in oil level between Full pan and allow oil to drain; no drain plug is provided. and Add is one (1) pint. To refill the transmission, tighten the filler tube attaching nut and add four (4) pints transmission fluid In order to check oil level accurately, the engine using J-4264 filler tube and funnel. Start engine and should be idled with the transmission oil at normal allow engine to idle in Neutral 3 - 5 minutes to warm temperature and the control lever in neutral (N) oil, then check oil and add as required to raise to the position. level of the "FULL" mark. Assuming that the con It is important that the oil level be · maintained no verter was not drained (since it is welded) and allow higher than the "FULL" mark on the transmission oil ing for a nominal spillage or draindown, approximately level gauge. DO NOT OVERFILL, for when the oil six (6) pints of oil will be required for refill. level is at the full mark on the dip stick, it is just slightly below the planetary gear unit. If oil is added CAUTION: Do not over-fill! which brings the oil level above the full mark, the The dry capacity of the transmission, including con planetary unit will run in the oil, foaming and aerating verter, is 12 pints. Normal refills require 6 pints. the oil. This may cause malfunction of the transmission assembly due to improper application of the band or SHIFT LINKAGE CHECK AND ADJUSTMENT clutches. Check If the transmission is found consistently low on oil, If improper shift linkage adjustment is suspected, a thorough inspection should be made to find and cor a check can be made quickly without any disassembly rect all external oil leaks. Transmission oil leakage is easily identified as all automatic transmission fluid used as described below: in Chevrolet production is dyed red. 1. Start engine. If job is cold, allow 2 - 3 minutes for Fig . 6E-l-Powerglide Transaxle-Cross Sectional View 1. Front Pump Cover 1". Reverse Clutch Front Reaction 26. Turbine Shaft "2. Long Pinion Gear 2. Front Pump Shaft Drive Hub Plate (Thick) 27. Front Pump Shaft "3. Reverse Clutch Plate Retaining 3. Front Pump Drive Gear 15. Reverse Clutch Faced Plates 28. Converter Hub Bushing Ring ". Front Pump Driven Gear (3 Used) 29. Canve.ter Pump "". Ring Gear 45. Valve Body Ditch Plate 5. Tronsminian Vent 16. Reverse Clutch Reaction Plate 30. Starter Gear 6. Front Pump Body (3 U,edI 46. Valve Body 7. Low Band Adjusting Screw and 17. Short Pinion 31. Stator 47. Oil Pick·up Pipe Lock Nut 18. Low Sun Gear Bushing 32. Turbine ".8,. Low Servo Piston 8. Low Band 19. Planet Carrier Hub (Transmillion 33. Engine Flex Plate 49. Low Servo Piston Cushion 9. Clutch Drum Reaction Plate Output) 3". Stator Com Race Spring (3 Used) 20. Reverse Piston 35. Converter Hub Seol 50. taw Servo Pilton Return Spring 10. Clutch Drum Faced Plate 21. Revers. Piston Return Spring 36. Stator Shaft 51. Clutch Drum Piston (2 Used) (17 U,edI 37. Pinion Shaft Rear Oil Seal 52. Clutch Drum Hub 11. Clutch Piston Return Spring 38. Pinion Shaft Bushing (15 U,edI 22. Rear Pump Driven Gear 53. Clutch Drum Selective Thrust 12. Turbine Shaft Front Bushing 23. Rear Pump Drive Gear 39. Rear Pump Wear Plate Washer 13. Reverse Clutch Retaining Ring 2". Governor Driven Gear "0. Reverse Piston Outer Seal 54. Clutch Drum BUlhing Clip 25. Governor Drive Gear ,,1. Planet Carrier Input Sun Gear 55. Front Pump Sady Bushing CORVAIR SHOP MANUAL AUTOMATIC TRANSMISSION 6E-4 I 1. If necessary, drain oil from transmission by un screwing filler tube nut, then remove oil pan. I 2. Place the range selector lever in the driving com partment in "0" (Drive). 3. Insert J-8365 into manual valve bore as shown I (Fig. 6E-3) with tab of gauge upward so it en gages to forward port of the valve body as shown in the inset, Figure 6E-3.