Engine Troubleshooting - Westerbeke SBEG Series Operator's Manual

ENGINE TROUBLESHOOTING
The following troubleshooting tables are based upon certain
engine problem indicators and the most likely causes of the
problems.
When troubleshooting indicates an electrical problem, see the
ELECTRICAL SYSTEM WIRING DIAGRAM
as these may
reveal other pcssible causes of the problem which are not
listed below.
PROBLEM PROBABLE CAUSE
Engine does not 1. Voltage drop at starter solenoid
crank.
terminal.
2. Engine circuit breaker has tripped.
3.
S amp fuse/holder is faulty.
4. Battery is low or dead.
5. Loose battery connections.
6. Faulty wire connection.
7.
Faulty start switch.
S.
Faulty starter relay.
9. Faulty starter solenoid.
10. Raw water filled cylinders.
Engine starts, runS
1. Faulty shutdown switch.
but then shuts
(oil pressure, coolant or exhaust
down.
temperature).
2. Dirty fuellwater separator filter.
3.
Faulty speed sensor.
4.
Low oil level in sump.
5. Faulty fuel pump.
6.
High engine water or
exhaust temperature.
7. Air in the fuel system.
Engine starts, runs 1.
Faulty mag. pick-up sensor.
but does not come
2. ECU faulty.
up to speed.
3. Fuel pump.
4. Fuel supply to engine restricted.
5. Throttle actuator binding.
6. Actuator or electrical connections
faulty.
. 1:-
A8
aenelelol
o,e,loed.~hort.
S. Air intake restricted.
9. Exhaust restricted.
10. Air in fuel system.
NOTE:
The engines control system (electrical system) is
protected by a
8
Ampere manual Juse located on the control
panel. The generator has an AC circuit breaker at the control
panel which should be in the off position when peiforming
troubleshooting.
CAUTION: When servicing or replacing DC
components, tum off the 20 amp DC circuit breaker.
PROBLEM PROBABLE CAUSE
Engine cranks but 1. Out offuel.
fails to start.
2. Engine is flooded.
3_
Bad ignition coil.
4. Faulty spark plug.
5. Unplugged distributor wire.
6.
Faulty electrical connection.
7. Air in the fuel system.
Engine hunts. 1. ECU gain adjustment needed.
2. Faulty fuel pump.
3.
Mag. pick-up sensor needs adjustment.
4. Low DC battery Voltage.
5. Generator overload.
6. Valves need adjustment.
Engine misfires. 1.
Poor quality fuel.
2. Incorrect timing.
3. Dirty flame arrester.
4. Cracked distributor cap.
5. Faulty ignition wires.
6. Throttle actuator linkage binding.
7.
High exhaust back-pressure.
S.
Valve clearances are incorrect.
Engine backfires.
1.
Spark plug wires are connected wrong.
2. Incorrect timing.
3. Engine is flooded.
4.
Dirty flame arrester.
5. Cracked distributor cap.
6 . High exhaust back-pressure.
Engine overheats. 1.
Coolant loss. Pressure test
COOling system. Refill.
2. Faulty raw water pump impeller.
3. Belts are loose or broken.
4. Raw water pump worn.
5. Faulty thermostat.
6. Heat exchanger restricted.
Engines
&
Generators
36