Observable Diagnostics and Tests
04
150
18
DPSG,RG40854,281 –19–27NOV00–2/2
• Engine overheating.
• Power loss.
• Engine runs rough.
• White exhaust smoke.
• Loss of cab heat.
• Gasket section dislodged, missing (blown).
• Coolant in cylinder.
• Coolant in crankcase oil.
• Low coolant level.
Possible Causes:
• Insufficient liner standout.
• Excessive liner standout differential between
cylinders.
• Low head bolt clamping loads.
• Rough/damaged liner flange surface.
• Cracked/deformed gasket combustion flange.
• Out-of-flat/damaged/rough cylinder head surface.
• Missing/mislocated gasket firing ring.
• Block cracked in liner support area.
• Excessive fuel delivery.
• Hydraulic or mechanical disturbance or combustion
seal.
NOTE: Cracked cylinder head or liners may also allow
combustion gas leakage into coolant.
If above symptoms are found, see HEAD GASKET
INSPECTION AND REPAIR SEQUENCE in Section
02, Group 020.
COOLANT SEAL LEAKAGE
Symptoms:
• Coolant discharge from head gasket crevice.
• Coolant in crankcase oil.
• Low coolant level.
• High oil level.
• Coolant discharge form crankcase vent.
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.
If above symptoms are found, see HEAD GASKET
INSPECTION AND REPAIR SEQUENCE in Section
02, Group 020.
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.
If above symptoms are found, see HEAD GASKET
INSPECTION AND REPAIR SEQUENCE in Section
02, Group 020.
NOTE: Defective oil cooler may also allow oil leakage
into coolant.
CTM100 (06APR04)
04-150-18
P
OWER
T
ECH
10.5 L & 12.5 L Diesel Engines
040604
PN=366
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