Table 4-2. Troubleshooting-Continued

TM 10-3930-632-12

Table 4-2. Troubleshooting-Continued

MALFUNCTON

TEST OR INSPECTION

CORRECTIVE ACTION

ENGINE-Continued

8. ENGINE MISFIRES ON ONE OR MORE CYLINDERS-Continued

Step 3. Inspect plug wires for incorrect installation.

Install plug wires correctly.

Step 4. Inspect distributor cap and rotor for burned or broken condition.

Replace distributor cap or rotor.

Step 5. Check engine compression.

Report to general support maintenance personnel.

Step 6. Check for leaking cylinder head gasket.

Replace gasket.

9. ENGINE DOES NOT IDLE PROPERLY.

Step 1. Check spark plugs for dirty condition or improper gap.

Clean plugs and reset gap.

Step 2. Check ignition timing.

Reset timing (para 4-64).

10. ENGINE MISSES AT HIGH SPEEDS.

Step 1. Spark plugs for dirty or defective condition and improper gap.

Clean, replace or reset plug gap.

Step 2. Check ignition coil and condenser for weak condition.

Replace coil and condenser.

Step 3. Check for sticking, dirty or improperly adjusted ignition points.

Clean, adjust or replace points (pare 4-34).

Step 4. Inspect distributor cap and rotor for cracks or burned condition.

Replace defective parts.

Step 5. Check for leaking cylinder head gasket.

Replace gasket or torque stud nuts (para 4-65).

Step 6. Check engine compression.

Report uneven compression to general support maintenance personnel.

Step 7. Inspect plug wires for cracked insulation.

Replace defective wires.

Step 8. Check choke adjustment.

Adjust choke (para 4-42).

Step 9. Inspect carburetor accelerator pump. Check for dirt in metering jets or incorrect float level.

Replace carburetor.

Step 10. Test fuel pump for sufficient fuel supply.

Replace fuel pump.

Step 11. Check air cleaner for dirty condition.

Clean or replace air cleaner element.

Step 12. Check for clogged fuel filter.

Clean or replace filter (para 4-44).

Step 13. Check for weak distributor breaker arm spring.

Replace point set (para 4-;4).

Step 14. Check for excessive play in distributor shaft.

Replace distributor (para 4-34).

11. ENGINE PINGS.

Step 1. Check ignition timing.

Reset timing (para 4-64).

Step 2. Check distributor for automatic spark advance stuck in advance position, or broken spring.

Replace distributor (para 4-34).

Step 3. Check to insure that correct fuel is being used.

Drain fuel system, fill with proper fuel.

12. ENGINE LACKS POWER.

Step 1. Check ignition timing.

Reset timing (para 4-64).

Step 2. Check to insure that correct fuel is being used.

Drain fuel system, fill with proper fuel.

Step 3. Check for leaking cylinder head gasket.

Replace gasket.

Step 4. Test engine running temperature-engine running cold.

Replace thermostat (para 4-54}.

Step 5. Check oil and grade of oil being used.

Replace with oil as outlined in lubrication order.

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