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 TM 55-1905-223-24-1
Table 4-1. Troubleshooting
Malfunction
Test or Inspection
Corrective Action
1. Coolant loss (internal).
STEP 1.
Check if cylinder liner is cracked/porous or if crevice seals are leaking. Check for cylinder
liner and crevice seal damage. Refer to para. 4-10.
2. Oil consumption excessive.
STEP 1. Check for worn or broken piston rings. Check blowby. Inspect and replace piston rings if
necessary. Refer to para. 4-16.
STEP 2. Check if piston ring grooves worn. Check blowby. Inspect and replace pistons if necessary.
Refer to para. 4-16.
STEP 3. Check for scored or damaged cylinder liners. Check blowby. Replace liners if nece sary.
s
Refer to para. 4-19.
3. Lube oil in coolant or coolant in lube oil.
STEP 1. Check for cracked or porous cylinder block. Inspect cylinder block. Refer to para. 4-18.
STEP 2. Check cylinder liner for cracked/porous or crevice seals leaking. Replace cylinder liner.
Refer to para. 4-19.
4. Exhaust smoke excessive under load.
STEP 1. Check if piston rings not sealing (blue smoke). Replace pistons and rings. Refer to para. 4-
16.
5. Engine crankcase gases (blowby excessive.
)
STEP 1. Check for broken cylinder liners. Replace cylinder liners. Refer to para. 4-19.
6. Main bearing noise.
STEP 1. Check for damaged or worn main bearings. Inspect main bearings and crankshaft journals.
Refer to para. 4-13.
STEP 2. Check for damaged or out-of-round crankshaft journals. Inspect the crankshaft journals.
Refer to para. 4-13.
4-4
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