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ENGINE TROUBLESHOOTING
PROBLEM
PROBABLE CAUSE
PROBLEM
PROBABLE CAUSE
Engine misfires.
1.
Poor quality fuel.
No DC charge to the
1.
Faulty connections to
2.
Incorrect timing.
starting battery.
battery charging control.
3.
Dirty flame arrester.
2.
Faulty battery charging control.
4.
Cracked distributor cap.
3.
Faulty bridge rectifier.
5.
Faulty ignition wires.
6.
Spark plugs are worn.
4.
Faulty generator charger
windings.
7. High exhaust back-pressure.
Blue exhaust smoke
1.
Lube oil is diluted.
8.
Valve clearances are incorrect.
discharge from the
2.
High lube oil level.
Engine backfires.
1.
Spark plug wires are connected
engine.
3.
Crankcase breather hose is clogged.
wrong.
4.
Valves are worn or adjusted
2.
Incorrect timing.
incorrectly.
3.
Engine is flooded. See Engine is
flooded under Engine cranks but
5.
Piston rings are worn
or unseated.
tails to start.
Black exhaust smoke
1.
Dirty flame arrester.
4.
Dirty flame arrester.
discharge from the
2.
Faulty carburetor.
5.
Cracked distributor cap.
engine.
3.
Idle mixture jet too rich.
6. High exhaust back-pressure.
4.
Accelerator diaphram leaking.
Engine overheats.
1.
Coolant loss. Pressure test
cooling system.
2.
Faulty raw water pump impeller.
3.
Belts are loose or broken.
5.
Valves are worn or incorrectly
adjusted.
6.
Lube oil is diluted.
4.
Raw water pump worn.
7. Piston rings are worn or unseated.
5.
Faulty thermostat.
8.
Crankcase breather hose is clogged.
Low oil pressure.
1.
Low oil level.
2.
Wrong SAE type oil in the engine.
Poor performance
1.
Main jet clogged. Remove and clean.
3.
Wrong type oil filter.
at generator speed.
2.
Carburetor inlet filter clogged.
4.
Relief valve is stuck.
Remove and clean.
5.
Faulty oil pump.
6.
Faulty engine bearings.
7. Faulty oil filter.
3.
Fuel pump clogged. Remove and
replace.
4.
Air intake filter screen dirty. Remove
and clean.
High oil pressure.
1.
Dirty oil or wrong SAE type oil in the
engine.
2.
Relief valve is stuck.
Engines & Generators
35
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