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Page Title:
Table 4-2. Troubleshooting-Continued |
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 TM 10-3930-632-12
Table 4-2. Troubleshooting-Continued
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
ENGINE-Continued
2.
ENGINE WILL NOT START (AMMETER SHOWS ABNORMAL DISCHARGE).
Step 1. Check for defective capacitor
Replace capacitor (para 4-34).
Step 2. Inspect distributor cap and rotor for short circuited or burned condition.
Replace defective parts (para 4-34).
Step 3. Check for short circuit in wire between ammeter and ignition switch.
Replace defective wire.
Step 4. Check ignition coil for short-circuited primary winding.
Replace coil (para 4-36).
3.
ENGINE WILL NOT START (WEAK SPARK OR NO SPARK).
Step 1. Check to insure that distributor points are opening.
Clean or replace and adjust points (para 4-34).
Step 2. Check for pitted or burned points.
File or replace points (para 4-34).
Step 3. Check for weak capacitor.
Replace capacitor (para 4-34).
Step 4. Check for weak coil.
Replace coil (para 4-36).
Step 5. Check spark plug gap.
Reset plug gap (para 4-35).
4.
ENGINE WILL NOT START (GOOD SPARK).
Step 1. Check carburetor for dirt, water or stuck float.
Replace or adjust carburetor (para 4-42).
Step 2. Check to insure that fuel is reaching carburetor.
Repair or replace lines between tank and fuel pump, and between pump and carburetor.
Step 3. Inspect to insure that spark wires are correctly installed in distributor cap.
Install wires correctly.
Step 4. Test engine timing.
Reset timing (para 4-64).
Step 5. Check fuel filter for clogged condition.
Replace fuel filter (para 4-44).
Step 6. Test fuel pump for proper output.
Replace inoperative pump (para 4-43).
5.
ENGINE BACKFIRES.
Step 1. Test ignition timing.
Reset timing (para 4-64).
Step 2. Check to see that plug wires are correctly installed in distributor cap.
Install wires correctly.
Step 3. Inspect distributor cap for cracks and shorts.
Replace defective distributor cap.
6.
ENGINE OPERATES ERRACTICALLY.
Step 1. Check ignition timing.
Reset timing (para 4-64).
Step 2. Check to see that spark plug wires are correctly installed.
Install wires correctly.
Step 3. Inspect carburetor for dirt or water.
Remove and clean carburetor. Clean fuel system.
Step 4. Check carburetor for proper adjustment
Adjust carburetor (para 4-42).
Step 5. Inspect cylinder head for excessive carbon buildup.
Remove carbon from cylinder head.
Step 6. Test fuel pump for sufficient pressure.
Repair or replace pump (para 4-43).
Step 7. Check for clogged fuel filter.
Replace filter.
Step 8. Inspect fuel lines for partially clogged or pinched condition.
Clean and repair fuel lines.
Step 9. Check for intake manifold leak.
Inspect gaskets and tighten mounting nuts.
Step 10. Inspect for cracked or shorted distributor cap.
Replace distributor cap.
Change 1 4-5
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