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30. STALLS UNDER DECELERATION OR HEAVY BRAKING | Up
/.25ton/TM-9-2320-289-34 CUCV Series Trucks at intermediate direct support and general support level Manual | Next
35. “RAPPlNG” SOUND FROM ONE OR MORE CYLINDERS |
TM 9-2320-289-34
Table 2-1, Mechanical Troubleshooting (Con’t)
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
33. BLUE SMOKE (ENGINE OIL BURNING IN CYLINDERS)
NOTE
Foamy or milky oil or rust on engine oil level indicator are evidence of
contamination,
Step 1.
Check engine oil level indicator for evidence of contamination.
Replace engine
oil and engine
oil filter if contaminated.
(See
TM 9-2320-289-20)
Step 2.
Replace crankcase depression regulator valve assembly. (See TM 9-2320-289-20)
Step 3.
Check compression of each cylinder. (See paragraph 3-2)
Step 4.
Remove cylinder head. (See paragraph 3-7) Inspect valve oil seals and valve
guides for damage.
Replace any damaged valve oil seals. (See paragraph 3-8) Repair valve
guides if damaged. (See paragraph 3-8)
34. VALVE TRAIN NOISE
Step 1.
Step 2.
Step 3.
Step 4.
Start engine and allow to reach operating temperature. Connect STE/lCE tester to
STE/lCE DCA connector under dash. (See TM 9-4910-571-12&P) Check engine oil
pressure at idle.
If oil pressure is less than 10 psi
Troubleshooting malfunction #25.
If oil pressure is 10 psi (69 kPa) or more,
Check oil pressure at 2000 rpm.
(69 kPa), perform Mechanical
perform step 2.
If oil pressure is less than 40 psi (276 kPa), perform Mechanical
Troubleshooting malfunction #25.
If oil pressure is 40 psi (276 kPa) or more, perform step 3.
Remove rocker arm covers. (See paragraph 3-6) Inspect rocker arm assemblies
and mounting bolts for looseness and damage.
Tighten mounting bolts to 40 Ib, -ft, (54 N.m) if loose.
If rocker arms appear loose or damaged, see paragraph 3-6.
Remove cylinder heads. (See paragraph 3-7) Check to see if any valve springs are
broken.
Replace any broken valve springs. (See paragraph 3-8)
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