G424 Service Manual Adjustment and Troubleshooting179
Engine Overheating
Symptom Cause
1. Mechanically related. A. Engine rpm below specification for W.O.T. (engine laboring).
B. Wrong ignition timing.
C. Spark plug wires crossed (wrong firing order).
D. Lean fuel mixture.
E. Wrong heat range spark plugs.
F Exhaust restriction.
G. Valve timing off caused by a jumped or improperly installed timing chain
and/or gears.
H. Blown head gasket(s).
I. Insufficient lubrication to moving parts of engine.
2. Cooling system related. A. Loose or broken drive belt.
B. Water shut-off valve partially or fully closed (if equipped).
C. Clogged or improperly installed water strainer (if equipped).
D. Water inlet hose kinked or collapsed.
E. Water pickup clogged.
F. Defective thermostat.
G. Obstruction in cooling system such as casting flash, sand, or rust.
H. Engine circulating pump defective.
I. Low coolant level.
J. Antifreeze not mixed properly.
K. Heat exchanger cores plugged.
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