TM 5-3805-281-24-2
Cylinder Head and Valves
NOTE: Cracked cylinder head, liners, liner packings,
defective oil cooler or aftercooler may also allow
coolant leakage into crankcase.
OIL SEAL LEAKAGE
Symptoms:
Oil discharge from head gasket crevice
Oil in coolant
Low crankcase oil level
Reduced oil to rocker arms (noisy)
Possible Causes:
Excessive liner standout
Excessive liner standout differential between cylinders
Low head bolt clamping loads
Out-of-flat/damaged/rough block surface
Out-of-flat/damaged/rough cylinder head surface
Oil or coolant overheating
Cracks/creases in gasket body surfaces
Damage/voids in elastomer beading of gasket
Damaged/missing O-ring seal at oil port to rocker arms
NOTE: Defective oil cooler may also allow oil leakage into
coolant.
RG,RG34710,1073
1923OCT974/4
11-103