TM 5-3805-281-24-2
Cylinder Head and Valves
Oil degradation, dilution, or contamination.
Incorrectly specified injection pump.
Indications of fuel or timing adjustments.
2. Obtain coolant and oil samples for further analysis.
3. Start and warm up engine if it can be safely operated.
Examine all potential leakage areas again as outlined
previously. Using appropriate test and measuring
equipment, check for the following:
White smoke, excessive raw fuel, or moisture in
exhaust system.
Air bubbles, gas trapped in radiator or overflow tank.
Loss of coolant from overflow.
Excessive cooling system pressure.
Coolant overheating.
Low coolant flow.
Loss of cab heating due to air lock (vehicle engines).
4. Shut engine down. Recheck crankcase, radiator, and
overflow tank for any significant differences in fluid
levels, viscosity, or appearance.
5. Compare your observations from above steps with the
following diagnostic charts.
If diagnostic evaluations and observations provide
conclusive evidence of combustion gas, coolant, or oil
leakage from head gasket joint, the cylinder head must
be removed for inspection and repair of gasket joint
components.
COMBUSTION SEAL LEAKAGE
Symptoms:
Exhaust from head gasket crevice
Air bubbles in radiator/overflow tank
Coolant discharge from overflow tube
Engine overheating
Power loss
Engine runs rough
White exhaust smoke
Loss of cab heat (vehicle engines)
Continued on next page
RG,RG34710,1073
1923OCT972/4
11-101
