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Page Title:
Table 4-4. Organizational Maintenance Troubleshooting |
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 TM 10-3930-630-12
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
Step 3.
Check fuel filter.
Service fuel filter if necessary (para 4-61).
Step 4.
Check distributor, coil and spark plugs.
Adjust distributor points or replace points if defective. Check coil and spark plugs and
replace if defective. Replace defective distributor, coil and spark plug wires (para 444).
3.
ENGINE HARD TO START
Step 1.
Check choke and carburetor controls.
Adjust choke and carburetor and controls if necessary (para 4-58).
Step 2.
Check distributor, coil, spark plugs and wires.
Adjust distributor, coil, spark plugs and wires.
Adjust distributor points or replace points. Replace defective coil, spark plugs and
wires (para 4-54).
Step 3.
Check air supply to engine.
If air cleaner indicator indicates cleaner is clogged, clean or replace air cleaner
element (para 4-57). Reset indicator.
4.
ENGINE STALLS AND STOPS FREQUENTLY
Step 1.
Check idle speed.
Adjust idle speed if necessary (para 4-58).
Step 2.
Check governor operation.
Adjust or replace governor if necessary (para 4-59).
Step 3.
Check carburetor and linkage operation.
Adjust linkage or replace carburetor if necessary (para 458).
5.
ENGINE OVERHEATS
Step 1.
Check fan belt for wear, stretching and proper adjustment.
Replace worn or stretched belt. Adjust belt to %inch deflection between pulleys (para
451).
Step 2.
Check radiator and hoses for leakage.
Tighten hose clamps or replace hoses if necessary. Repair leaks if possible (para 4-69).
Step 3. Check thermostat operation.
Replace defective thermostat (para 4-70).
6.
ENGINE EMITS BLACK SMOKE FROM EXHAUST
Step 1.
Check air supply to engine.
If indicator shows air cleaner is restricted, clean or replace element and reset
indicator (para 457).
Step 2.
Check carburetor settings and adjustments.
Adjust carburetor, carburetor linkage or replace defective carburetor (para 4-58).
7.
ENGINE OIL PRESSURE LOW
Step 1.
Check oil lines for leakage
Repair or replace oil lines.
Step 2.
Check oil pressure regulator valve.
Adjust regulator valve.
Step &.
Check oil pressure gage.
Replace defective oil pressure gage (para 432).
8. STARTER WILL NOT CRANK ENGINE
Step 1.
Check battery and cables.
Tighten, clean or replace battery and/or cables (para 4.46).
Step 2.
Check neutral start switch.
Replace defective neutral start switch (para 4-100).
Step 3.
Check starter operation.
Tighten connections or replace defective starter (para 4-52)
4-8
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