Engine Troubleshooting - Westerbeke 4.5 BCG Operator's Manual

ENGINE TROUBLESHOOTING
PROBLEM PROBABLE CAUSE PROBLEM
PROBABLE CAUSE
Engine misfires.
1. Poor quality fuel.
High oil pressure. 1.
Dirty oil or wrong SAE type oil in the
2. Incorrect timing.
engine.
3. Dirty flame arrester.
2. Relief valve is stuck.
4. Cracked distributor cap.
No DC charge to the 1. Faulty connections.
5.
Faulty ignition wires.
starting battery.
I
6. Spark plugs are worn.
2. Faulty bridge rectifier.
7. High exhaust back-pressure.
3. Faulty generator charger
8. Valve clearances are incorrect.
windings.
Engine bacRfires. 1. Spark plug wires are connected
wrong.
2.
Incorrect timing.
4.
Connections to the controller are
loose or faulty.
5. Faulty controller.
3. Engine is flooded. See Engine is
flooded under Engine cranks but fails
to
start·
Blue exhaust smoke 1. Lube oil is diluted.
discharge from the
2. High lube oil level.
engine.
3. Crankcase breather hose.is clogged.
4. Dirty flame arrester.
4. Valves are worn or adjusted
5.
Cracked distributor cap.
incorrectly.
6. High exhaust back-pressure.
5. Piston rings are worn
7.
Choke is stuck closed.
or unseated.
Engine overheats. 1. Coolant loss. Pressure test
.
cooling system.
2. Faulty raw water pump impeller.
Black exhaust smoke
1.
Dirty
flame arrester.
discharge from the
2. Faulty carburetor.
engine.
3. Idle mixture jet too rich.
3, Belts are loose or broken.
4. Valves are worn or incorrectly
4. Raw water pump worn.
· adjusted.
5. Faulty thermostat.
5. Lube oil is diluted.
6. Heat exchanger is clogged.
6. Piston rings are worn or unseated.
7. Collasped hose.
7. Crankcase breather hose is clogged.
Low oil pressure.
1. Low oil level.
2. Wrong SAE type oil in the engine,
3. Wrong type oil filter.
4.
Relief valve is stuck.
5. Faulty oil pump,
6. Faulty engine bearings.
I
7.
Faulty oil filter.
Engines
&
Generators
27