¨ ure 2) and plug the valve on the bottom with NOTE: A certain amount EXHAUST RESTRICTION TEST CP7803 tape or other suitable means. of even pulsing is nor- Fig. 5 5 With gauge connected to a source of 5. Using the hose supplied, connect the Vacuum mal, notably on 6 and 4 0 engines, and 10 1 manifold vacuum, increase engine speed to 2000 VACUUM GAUGE/ Gauge to a source of manifold vacuum. This 0 2 3 RPM, maintain this speed, and note the vacuum does not necessarily in- Engine 1 may be a fitting on the below the 15 Vacuum 2 4 gauge reading. A gradually decreasing vacuum dicate a leaky condition. Fuel3 5 PRESSURE TESTER KIT plate, or a fitting in the intake manifold. Pump 4 psi 5 6 reading may indicate a restricted . 6 7 See Figures 2 and 9. Check for: 20 7 8 (Partially blocked or tailpipe.) 9 6. Crank the engine and note Vacuum Gauge 1. Burned or stuck valve. 10 INSTRUCTIONS 25 reading. 2. Intake manifold leak 30 (After testing, return adjustment screws to their at one cylinder. POSITIVE CRANKING VACUUM TESTS original positions.) 3. Worn intake valve guide. VENTILATION (PCV) VALVE TEST Engine Condition Test Test Results 4. Broken or piston rings. 1. Unplug the PCV valve, plugged previously with 1. Start engine and allow it to warm to normal The general condition of an engine is indicated by a piece of tape (Step 4, Cranking Vacuum operating temperature. Stop engine. To pre- one of three possible gauge readings: Tests) and crank engine. RUNNING VACUUM TEST vent the engine from starting, disable the igni- A.(Figure 3) A reasonably steady vacuum read- A. If the PCV valve is operating properly, the tion system. ing of 4 inches or more on emission controlled vacuum will drop to about one-half the value Engine Condition Test 2. Remove the . Back out the idle speed engines, and 10 inches or more on non-emis- noted in Step 6, Cranking Vacuum Tests. screw (see Figure 1) until the throttle valve is sion controlled engines (pre-1968) indicates While performing a running vacuum test, it is B. A reading much lower than one-halfindicates tighly closed. If the carburetor is also equipped correct engine vacuum. Readings may vary possible to obtain a different gauge indication than excessive flow which could upset the proper with an idle air bleed screw, turn the screw considerably on different engines, but should that obtained under the cranking vacuum test. carburetor air/fuel ratio causing rough idling clockwise until it bottoms lightly. In both cases, not fall below these minimums. (See 1. Connect the vacuum gauge to a source of and burned valves. count the number of turns so the screws can be manufacturer’s specifications). manifold vacuum. See Figures 2 and 9. C. No change in the vacuum indicates a clogged returned to their original positions after the tests. 2. Run the engine at normal operating tempera- PCV valve. 3. If the is equipped with an idle stop Fig. 3 Fig. 4 ture and idle speed. 2. Return the idle screw (and idle air bleed screw) solenoid (See Figure 1), disconnect the electri- to its original position. (See Step 2, Cranking cal wire at the base of the solenoid under the 5 0 5 0 10 1 10 1 Vacuum Tests). rubber boot or at the connector as shown. 0 2 0 2 Fig. 6 Fig. 7 3 3 3. Re-enable the . Engine 1 Engine 1 4. If the engine is equipped with a PCV (Positive 15 Vacuum 2 4 15 Vacuum 2 4 5 5 0 Fuel3 5 Fuel3 5 0 4. Re-connect the wire to the idle stop solenoid. Crankcase Ventilation) system, remove the PCV Pump 4 psi Pump 4 psi 10 1 10 1 6 6 5 5 2 2 valve at the engine cover (see Fig- 6 7 6 7 0 0 5. Re-connect all hoses and vacuum lines. 20 7 20 7 3 3 8 8 Engine 1 Engine 1 2 9 9 15 Vacuum 2 4 15 Vacuum 4 10 10 Fuel3 5 Fuel3 5 6. Re-install the PCV valve in its proper location. 25 25 Pump 4 psi Pump 4 psi Fig. 1 30 30 5 6 5 6 6 7 6 7 20 7 20 7 8 8 IDLE 9 9 10 10 SPEED 25 25 PCV SYSTEM TEST SCREW 30 30 B.(Figure 4) An excessively low, steady vacuum 1. Operate the engine at normal temperature and is caused by a condition which affects all cylin- idle speed. ders equally. IDLE MIXTURE Test Results 2. Remove the hose connected between the air SCREWS Check for: cleaner and valve cover or oil filler/breather cap A.(Figure 6) A steady reading between 15 and 22 as shown in Figure 8. Plug the oil dipstick tube 1. Leaking carburetor flange gasket. inches indicates a mechanically sound engine. DISCONNECT to prevent an air leak. ELECTRICAL 2. Worn carburetor throttle shaft. B.(Figure 7) A pointer which sweeps or wanders CONNECTOR OR 3. Leaking vacuum lines. erratically through several inches indicates a TERMINAL UNDER Fig. 8 FILLER/BREATHER CAP RUBBER IDLE STOP 4. Improper . malfunction affecting all cylinders unequally RUBBER COVER 5 0 VENT COVER SOLENOID 10 1 and inconsistently. To help isolate the troubled 0 2 3 HOSE 5. Slow engine cranking due to: Engine 1 AIR 15 Vacuum 2 4 Fuel3 5 area, run the engine at about 2000 RPM. If the Pump 4 psi 5 6 CLEANER 6 7 20 7 A. Battery 8 9 pointer steadies, check for: 10 Fig. 2 25 AIR CLEANER B. Battery cable connections 30 1. Ignition and/or timing. SOURCE OF C. Defective motor 2. Carburetor mixture adjustment at idle. MANIFOLD D. Excessive mechanical drag in engine caused by: VACUUM PCV If the sweep gets larger, check for weak or VALVE 1. Tight fitting in rebuilt engine. UNIVERSAL 2. Thickened oil due to excessive oxidation. broken valve springs. If the sweep becomes RUBBER shorter and more rapid, check for: CLOSED C.(Figure 5) A reading which pulses unevenly ADAPTER BREATHER ROCKER ARM 1. Carburetor or intake manifold leaks. PLUG OIL CAP VALVE COVER indicates a leaky condition which affects one or DIPSTICK HOLE more, but not all cylinders. 2. Sticky valves. 3. Hold the vacuum gauge with rubber universal NOTE: The vacuum reading can appear to be CARBURETOR Fig. 11 5 adaptor firmly over the valve cover hole or filler/ normal during the above tests while the advance Fig. 12 0 10 CONNECTION 1 0 2 1 breather cap opening. mechanism is defective; that is, frozen due to rust, Engine 3 2 15 Vacuum 4 Fuel 3 5 Pump 4 psi 6 3 dirt or corrosion. 5 6 7 A. A properly working PCV system will draw a 20 7 8 9 10 25 vacuum of about 3 to 5 inches within 10 seconds. 30 B. If there is very little or no change in the TESTING 4 gauge reading in the first 10 to 15 seconds of 1 6 the test the PCV valve is clogged or frozen, or CAUTION: Use extreme care in disconnecting 5 fuel lines. Catch all gasoline in a container and TO there is excessive air leakage in the vacuum GASOLINE discard. Leaking gasoline is a serious fire FUEL hose between the intake manifold and PCV TANK 2 valve (or other leakage into the crankcase). hazard. 4. Repair or replace the defective parts as needed Initial Inspection and reconnect hoses. Before testing, check tightness of all fittings and VOLUME TEST connections. 1. Operate engine with fuel line connected to fill Check the rubber fuel lines at the fuel pump for Vacuum & Pressure Tester Kit VACUUM carburetor fuel bowl. Stop Engine. deterioration, such as splitting, cracking and Repair Parts ADVANCE MECHANISMS spongyness. 2. Disconnect the fuel line at the carburetor and connect a flexible hose to the fuel line using the Key If leaks are evident in lines or fittings, repair or The amount of spark ignition advance needed is adapter as shown in Figure 11. Insert the other No. Part No. Description determined by the intake manifold vacuum and replace as necessary. If leakage is detected in the end of the hose in a proper gasoline container. engine speed. pump at the diaphragm flange, in the sheet metal 1 31-269 Vacuum and Pressure Gauge 3. Have an assistant start the engine. While hold- The vacuum advance mechanism in the distributor cover, or in casting breather holes, replace the 2 400-384 Black Rubber Hose for air fuel pump. Check fuel level and remove any kinks ing the gasoline can, carefully collect the dis- is connected to the intake manifold or carburetor by charge from the fuel pump for exactly 30 and fuel (24") a rubber hose. To measure the amount of vacuum in the fuel line. It is not necessary to remove the fuel pump for any of these inspections. seconds. The assistant must count off the time 3 1000-1113 Universal Adapter – at any RPM, disconnect the hose from the distribu- precisely and turn off the engine after the 30 Fuel line, air and PVC tor and insert a “Tee” connector (Item 4, Figure 12) Procedure seconds to get an accurate measurement. Re- in line with this hose and another back to the 4 400-810 "Tee" Fitting 1. Disconnect the fuel line between the fuel pump connect the fuel line to the carburetor. distributor as shown in Figure 9. Also, connect the 5 400-819 Tapered Hose Adapter and the carburetor and attach the vacuum gauge 4. Remove the gasoline from the engine area. gauge to the “Tee” as shown. hose to the fuel line, using adaptors as neces- Pour the contents of the gasoline can into 6 180-784 1/8 NPT X 0.187 Barb sary. (See Figure 10). another container marked off in fluid ounces 2-202002 Instruction Manual Fig. 9 NOTE: The fuel in the carburetor fuel bowl will be such as a kitchen measuring cup. Record the sufficient to run the engine for these tests. fuel quantity.

5 0 ALTERNATE VACUUM 10 1 0 2 5. After taking all measurements, return the fuel to 1 3 2. Operate the engine at idle. Hold gauge at Engine CONNECTION ON CARBURETOR 15 Vacuum 2 4 Fuel3 5 Pump 4 psi 5 6 the vehicle’s gas tank. 6 carburetor height and note the reading. Stop One Year Warranty 7 20 7 8 9 10 25 30 engine and re-connect fuel line. If within one year from the date of purchase this Test Results equipment fails due to defect in materials or work- Test Results Consult the manufacturer’s specifications for re- manship, return it to Actron and Actron will repair it free of charge. quired fuel delivery rate. If specifications are not Compare the observed reading with the This warranty gives you specific legal rights, and you manufacturer’s specifications. If specifications are readily available, use the following table as a guide. may also have other rights which may vary from state not immediately available, fuel pump pressure to state. Ozs. Collected MANIFOLD VACUUM can be considered satisfactory if it is between 4 (CID) (30 seconds) CONNECTION and 6 PSI, with lower readings for smaller dis- Customer Service placement engines. If pressure reading falls out- Up to 225 8 For product information or customer service side this range, consult the manufacturer’s speci- 225 to 350 11 Test Results please call 1-800-ACTRON-7 (1-800-228-7667) fications before replacing the fuel pump. On many systems, little or no vacuum is applied to Over 350 16 Monday through Friday, between 8:30 a.m. and the distributor at idle; as the throttle is opened wider If the above conditions are not met, replace or 4:30 p.m. Eastern time or fax anytime at (engine RPM increases), the vacuum gradually in- repair the defective components. (216) 651-2388. creases. The manifold vacuum drops when the en- Fig. 10 CARBURETOR CONNECTION Actron can also be reached by Email or on the gine is accelerated in proportion to the amount of Internet.

5 0 throttle advance. The gauge should read between 10 1 0 2 3 Engine 1 15 Vacuum 2 4 Fuel3 5 Pump 4 psi Email address: [email protected] 5 6 6 7 20 7 18 and 21 for normal engines. Check vehicle manual 8 ¨ 9 10 25 for your for proper value. 30 Internet home page: http://www.actron.com If the vacuum gauge does not change or changes very little with a change in RPM as described above, the TO Actron Manufacturing Company ©1997 Actron Manufacturing Company. Sunpro is a FUEL 9999 Walford Avenue registered trademark of Snap-On Tools Company and is vacuum hose may be open or cracked, or the diaphram TANK used under exclusive license. in the advance mechanism may be punctured. Cleveland, Ohio 44102-4696 2-202002