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 TM 55-1905-223-24-5
Table 4-1 lists the common fault conditions that may be found during operation or maintenance of the
equipment. Look for causes and do corrective actions in the order listed. This manual cannot list every
symptom that may show up, and it cannot list all the possible causes and corrective actions. If a symptom is
not listed, or if it keeps up after you have performed the corrective actions, notify your supervisor.
Table 4-1. Troubleshooting
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
1. Lubricating or hydraulic oil in coolant.
STEP 1.
Check to see if cylinder head is cracked.
Pressure test cylinder head (para. 4-12).
2. Fuel in the lubricating oil.
STEP 1.
Check to see if cylinder head is cracked.
Pressure test cylinder head (para. 4-12).
3. Warm engine runs rough or misfires in operating range.
STEP 1.
Check for broken rocker levers, push rods bent, or damaged valves.
a.
Inspect push rods or rocker levers (para. 4-12).
b.
Inspect valves (para. 4-13).
STEP 2.
Check for damaged camshaft.
Inspect camshaft (para. 4-16).
4. Rough idle.
STEP 1.
Check for worn or damaged valves.
Pressure test cylinder head (para. 4-12).
5. Excessive crankcase gases (blowby).
STEP 1.
Check for worn or damaged piston rings.
Inspect pistons and ring (para. 4-17).
STEP 2.
Check for worn or damaged cylinder liners.
Repair cylinder liners (para. 4-20).
6. Excessive engine noise.
STEP 1.
Check for damaged pushrod or cam follower.
Inspect pushrods and cam followers (para. 4-12).
STEP 2.
Check for connecting rod or rod bearing noise.
a.
Inspect connecting rod bearings (para. 4-17).
b.
Inspect connecting rod (para. 4-17).
c.
Inspect connecting rod caps and capscrews (para. 4-17).
d.
Inspect crankshaft journals (para. 4-19).
4-3
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