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Trouble
Engine overheating
Engine hunting
Engine misfires
High oil pressure
Low oil pressure
No DC charge to start
battery
Black exhaust smoke
Blue exhaust smoke
ENGINE TROUBLESHOOTING
(continued)
Possible Cause
1.
Coolant loss
(Pressure test system)
2.
Belts loose or broken
3.
Sea water pump impeller faulty
4.
Sea water pump worn
5.
Faulty hose
6.
Thermostat stuck closed
7.
Exchanger clogged
8.
Faulty gauge (check with
thermometer)
1.
Throttle linkage binding
2.
Dirty fuel filter
3.
Defective fuel pump
4.
Governor out of adjustment
5.
Valves out of adjustment
6.
Generator overloaded
7.
Cracked distributor
8.
Faulty high-tension leads
1.
Ignition timing wrong
2.
Spark plug worn
3.
Valve clearance incorrect
4.
Dirty carburetor
5.
Dirty air cleaner
6.
Poor quality fuel
1.
Faulty gauge
2.
Relief valve stuck
3.
Dirty or wrong SAE oil
1.
Low oil level
2.
Faulty gauge
3.
Wrong SAE oil
4.
Stuck relief valve
5.
Faulty oil pump
1.
Connections to alternator
loose or faulty
2.
Faulty alternator
3.
No excitation to alternator
IG terminal
1.
Dirty air intake
2.
Choke stuck closed
3.
Carburetor flooding
1.
Worn or misadjusted valves
2.
Worn or unseated piston rings
3.
Lube oil diluted
4.
Crankcase breather hose clogged
41
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