Table 4-2. Troubleshooting-Continued

TM 10-3930-632-12

Table 4-2. Troubleshooting-Continued

MALFUNCTION

TEST OR INSPECTION

CORRECTIVE ACTION

ENGINE-Continued

15. HIGH FUEL CONSUMPTION-Continued

Step 15. Test for weak coil.

Replace coil.

Step 16. Check for clogged exhaust system; damaged pipes.

Replace defective parts.

16. LOW FUEL PRESSURE.

Step 1. Check for air leaks in fuel lines.

Tighten connections.

Step 2. Test fuel pump pressure. Inspect pump diaphragm and linkage.

Replace fuel pump.

Step 3. Check for clogged fuel lines.

Clean fuel lines.

17. ENGINE IDLES TOO FAST.

Step 1. Check carburetor throttle stop adjustment.

Adjust idle speed adjust screw.

Step 2. Accelerator linkage sticking.

Free and lubricate linkage.

Step 3. Check tension of accelerator linkage return spring.

Replace spring.

18. FUEL GAGE DOES NOT REGISTER.

Step 1. Check wire connections between tank and gage.

Tighten connections.

19. LOSS OF COOLANT.

Step 1. Check for loose hose connections.

Tighten hose connections.

Step 2. Inspect hoses for damage and deterioration.

Replace hoses.

Step 3. Check radiator for leaks.

Replace radiator (para 4-53).

20. ENGINE TOO COOL DURING OPERATION.

Step 1. Test thermostat for proper operation.

Replace defective thermostat and gasket (para 4-54).

21. ENGINE OVERHEATS.

Step 1. Check for obstructions in radiator core.

Clear obstructions.

Step 2. Check engine coolant level.

Fill radiator to proper level.

Step 3. Test thermostat for proper operation.

Replace thermostat.

Step 4. Check for leaking cylinder head gasket.

Replace gasket.

Step 5. Inspect coolant hoses and fan belt for wear and deterioration.

Replace unserviceable parts.

Step 6. Inspect radiator and water pump for leaks.

Replace defective parts.

Step 7. Check for loose fan belts.

Adjust fan belts (para 4-55).

Step 8. Check ignition timing.

Reset timing (para 4-64).

Step 9. Inspect muffler and pipes for damage and clogging.

Replace defective parts.

Step 10. Check to insure that crankcase is full and that proper grade of oil is being used.

Fill crankcase with proper grade of oil.

Step 11. Check air cleaner element for restriction.

Clean or replace element.

Step 12. Check ignition timing.

Reset timing (para 4-64).

Step 13. Check engine compression.

Report condition to general support maintenance personnel.

4-9