Table 2-1. Troubleshooting - Continued

TM 10-3930-630-34

Table 2-1. Troubleshooting - Continued

MALFUNCTION

TEST OR INSPECTION

CORRECTIVE ACTION

4. EXPLOSION IN EXHAUST.

Step 1. Check for partially open exhaust valve.

Replace broken or defective spring (para 11-4).

Step 2.

Check for improper timing.

Check distributor, spark plugs and engine timing (TM 10-3930-630-12).

5. ENGINE RUNS IRREGULARLY.

Step 1.

Check for warped or burned valves.

Replace valves (para 11-4).

Step 2. Check for leaking valves.

Adjust, grind or replace as necessary (para 11-4).

6. ENGINE OIL PRESSURE LOW.

Step 1. Check relief valve for dirt or broken spring.

Clean relief valve or replace spring (para 11-14).

Step 2. Check oil pump for clogged screen.

Clean screen (para 11-11).

Step 3. Check oil pump for wear and damage.

Repair or replace oil pump (para 11-11).

Step 4. Check for worn main or connecting rod bearings.

Replace worn bearings (para 11-18).

Step 5. Check for worn camshaft bearings.

Replace worn bearings (para 11-25).

7. ENGINE OIL CONSUMPTION HIGH.

Step 1. Check compression of engine.

Adjust or replace valves or pistons (para 11-4 and 11-18).

Step 2. Check for stuck or damaged relief valve.

Clean or repair relief valve (para 11-14).

Step 3. Check for worn or damaged piston rings and pistons.

Replace pistons and/or piston rings (para 11-18).

Step 4. Check for worn bearings.

Replace bearings (para 11-18).

Step 5.

Check for worn valve guides.

Replace valve guides (para 11-4).

8. TRANSMISSION DOES NOT OPERATE PROPERLY.

Step 1.

Check for dirty or defective control valve.

Repair or replace control valve (para 12-7).

Step 2.

Check for defective transmission pump.

Repair or replace transmission pump (para 12-12).

Step 3.

Check clutch pressures.

Repair or replace clutches (para 12-13).

9. DRIVE AXLE DOES NOT OPERATE PROPERLY.

Step 1.

Check for damaged or defective differential.

Repair or replace differential (para 10-15).

Step 2.

Check for correct axle clearances.

Adjust clearances or repair axle (para 10-11).

10. ALTERNATOR NOT OPERATING PROPERLY.

Step 1.

Check for worn brushes and damaged springs.

Replace springs and/or brushes (para 4-3).

Step 2.

Check for dirty or worn commutator.

Repair commutator or replace armature (para 4-3).

Step 3.

Check for grounded or open rotor.

Replace rotor (para 4-3).

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