TM 5-1940-277-34
TROUBLESHOOTING PROCEDURES (Continued)
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
5.
EXCESSIVE CRANKCASE PRESSURE (OIL COLLECTING IN BREATHER SEDIMENTER BOWL OR BEING
BLOWN OVERBOARD)
Step 1.
Check for obstruction in exhaust pipe by using hand and feeling exhaust output for each engine.
a.
If exhaust output appears restricted remove the exhaust flexible bellows and check exhaust
pipes for obstructions (refer to TM 5-1940-277-20).
b.
If no obstruction is evident go to step 2.
Step 2.
Remove header tank cap. Start engine and observe water in tank for continual bubbling as
evidence of leaking head gasket.
a.
Replace head gasket (refer to page 2-291).
b.
Change engine oil (refer to TM 5-1940-277-20).
c.
If no evidence of head gasket failure found contact supervisor.
WARNING
Cap under pressure when water hot. Remove carefully. Severe bums may result
Step 3.
Perform cylinder compression test to determine where blow-by is occurring (refer to page 2-173).
a.
Report broken or worn piston rings, piston or sleeve to General Support.
Change 1
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