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Page Title:
ENGINE SPEED VARIES OR ENGINE SURGES. |
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 ENGINE--Continued
Step 3. Check for improperly adjusted valve tappets.
Adjust valve tappet clearance (para 3-17).
Step 4. Check for weak valve springs.
Replace valve springs (para 3-17).
Step 5. Check for worn piston rings or rings stuck in piston due to carbon accumulation.
Replace piston rings (para 3-15).
Step 6. Check for scored cylinders.
Rebore the cylinders and fit with oversize pistons and rings. If you find that the cylinders are
severely scored, replace the cylinder block (para 3-16).
Step 7. Check for defective piston or connecting rod.
Replace as necessary (para 3-15).
4.
ENGINE RUNS BUT CONTINIOUSLY MISFIRES.
Step 1. Test for uneven compression (TM 5-4320-272-12).
Refer to malfunction 3 for corrective action.
5.
ENGINE OVERHEATS.
Step 1. Check for damaged or missing air shrouding.
Repair or replace damaged or missing air shrouding (para 3-7).
Step 2. Check for buildup of carbon on the cylinder head.
Remove carbon and lead deposits with a wire brush and metal scraper (para 3-8).
6.
ENGINE LACKS POWER, SMOKES, OR OPERATES ERRATICALLY.
Step 1. Check for sticking valves.
Free stuck valves. Replace or regrind if burned (para 3-17).
Step 2. Check for weak valve springs.
Replace valve springs (para 3-17).
Step 3. Check for worn piston rings.
Replace piston rings (para 3-15).
7.
ENGINE MAKES EXCESSIVE NOISE.
Step 1. Check for a buildup of carbon and lead on the cylinder head.
Remove with a wire brush and metal scraper (para 3-8).
Step 2. Check for loose flywheel mounting.
Tighten flywheel mounting nut (para 3-5).
Step 3. Check for loose, burned, or otherwise defective connecting rod bearings.
Replace defective bearings (para 3-15).
Step 4. Check for worn or loose piston pin and bushing.
Replace worn pin and bushing (para 3-15).
Step 5. Check for worn piston.
Replace worn piston (para 3-15).
FUEL SYSTEM
ENGINE SPEED VARIES OR ENGINE SURGES.
Check for defective governor.
Replace defective governor (para 3-9).
PUMP ASSEMBLY
1. PUMP RUNS WITH NO DISCHARGE OR WITH LOW DISCHARGE
Step 1. Check for a broken, worn, or damaged impeller.
Replace impeller (para 4-3).
Step 2. Check for excessively worn wear rings.
Replace worn wear rings (para 4-3).
Step 3. Check for worn wear plates.
Replace worn wear plates (para 4-3).
2. PUMP MAKES EXCESSIVE NOISE.
Check for loose impeller or wear plates.
Tighten impeller or replace wear plates (para 4-3).
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