TM 5-3805-280-24-2
Engine System Operation and Tests
105
Coolant discharge from overflow tube
14
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 fire ring
Block cracked in liner support area
Excessive fuel delivery
Advanced injection pump timing
Hydraulic or mechanical disturbance of combustion seal
NOTE: Cracked cylinder head or liners may also allow
combustion gas leakage into coolant.
COOLANT SEAL LEAKAGE
Symptoms:
Coolant discharge from head gasket crevice
Coolant in crankcase oil
Low coolant level
High oil level
Coolant discharge from 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
Continued on next page
RG,105,JW7657
1921NOV973/4
13-491
