Table 3-1. Operator/Crew Preventive Maintenance Checks and Services - Continued

TM 10-3930-630-12

MALFUNCTION

TEST OR INSPECTION

CORRECTIVE ACTION

1. ENGINE FAILS TO TURN OVER

Step 1. Check to see if transmission shift lever is in neutral (N) position.

Place lever in neutral (N) position.

Step 2. Check for weak or defective battery.

Notify organizational maintenance.

Step 3. Check for defective or shorted wiring.

Notify organizational maintenance.

2. ENGINE FAILS TO START

Step 1. Check cranking speed.

If cranking speed is too slow, check battery connections If battery is defective, notify organizational

maintenance.

Step 2. Check choke and carburetor controls (para 2-2)

If controls are defective, notify organizational maintenance.

Step 3. Check fuel shutoff valve, fuel tank and fuel filter (para 3-11).

Fill tank if necessary. Notify organizational maintenance if filter requires service.

Step 4. Check distributor, coil, spark plugs and wires (para 3-14).

If distributor, coil plugs or wires are defective, notify organizational maintenance.

3 ENGINE HARD TO START.

Step 1. Check choke and carburetor controls (para 2-2).

If controls require adjustment or are defective notify organizational maintenance

Step 2. Check distributor, coil, spark plugs and wires.

If parts are not operating properly or are defective notify organizational maintenance.

Step 3. Check air supply to engine (para 4-7).

If air cleaner indicator indicates the air cleaner is dirty or clogged, clean or replace element.

4. ENGINE STALLS AND STOPS FREQUENTLY.

Step 1. Check fuel shutoff valve (para 3-11).

Open valve completely.

Step 2. Check idle speed (para 24).

If idle speed requires adjusting, notify organizational maintenance.

Step 3. Check governor operation (para 24).

If governor requires adjustment or replacement, notify organizational maintenance.

Step 4. Check carburetor and linkage operation (para 2-4).

If carburetor or linkage requires adjustment or service notify organizational maintenance.

5. ENGINE OVERHEATS.

Step 1. Check coolant level (para 3-12).

Replenish engine coolant if necessary.

Step 2. Check radiator air passages (para 3-12).

Clean air passages if necessary.

Step 3. Check radiator and hoses for leakage (para 3-12).

If leakage is present, notify organizational maintenance.

Step 4. Check thermostat operation (para 4-70)

If thermostat does not operate properly, notify organizational maintenance.

6. ENGINE EMITS BLACK SMOKE FROM EXHAUST.

Step 1. Check air supply to engine (para 3-10).

If indicator indicates air supply is restricted, notify organizational maintenance.

Step 2. Check carburetor operation.

If carburetor requires adjustment or service, notify organizational maintenance.

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