TM 5-3805-280-24-2
Engine System Operation and Tests
Cracks/creases in gasket body surfaces
105
15
Damage/voids in elastomer beading
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
Damaged/missing O-ring seal at oil port to rocker arms
NOTE: Defective oil cooler may also allow oil leakage into
coolant.
RG,105,JW7657 1921NOV974/4
13-492
