Westerbeke 6.5 MCG Service Manual page 6

·ENGINE TROUBLESHOOJINQ: . .
The following troubleshooting chart describes certain problems
and causes relating to engine service. Also note there is a
Diagnostic Troubleshooting section.
Problem
Engine does not crank.
Engine cr'anks, does not start
(engine will crank 8 seconds)
(3 crank cycles before underspeed fault occurs)
Engine starts, runs and the shuts down.
Engine hunts.
Engine ll)isfires/back firing.
Engine overheats/engine temp LED is illuminated.
Exhaust temp LEO is illuminated.
Low oil pressure/oil pressure LEO is illuminated.
Note:
When servicing the engine/generator, the main circuit
breaker (control panel) disconnects all AC power and can be
switched off and reset manually .
. Possible Cause
1.
DC panel breaker OFF.
2.0C battery OFF-
3.1<2 relay faulty.
4·.Starter solenoid faulty .
. 5.0C_battery low/dead
Of?
LOOSEBIUTERYCABLE.
6: Wiring harness disconnected
7. Water filled cylinder.
8.DC panelS amp buss fuse is faulty.
1.Fuel starVation.
2.Air in fuel system.
3.Fouled spark plugs.
4.Faulty ignition coil.
1.Fuel starvation.
2.Air in fuel system.
3.F,aulty shutdown switch/sensor.
4.Faulty fuel pump.
1.Air in fuel system.
2.Faulty fuel pump.
3.Low octane fuel (lower than 89).
4.Faulty
spe~d
sensor (crankshaft).
1.Low octane fuel (lower than 89}.
2.Dirty air intake screen.
3.High tension ignition wires.
4.Exha:ust restriction.
5.Wom/fouled spark plug.
&.Faulty ignition coil.
7 .low or no .fuel pressure. Poor quality fuel.
1.Raw water coolant flow obstruction.
2.Coolant level iow.
3.Faulty impeller.
4.Pump belt loose/broken.
5.Stuck thermostat.
&.Air in cooling system (fresh water).
1.Loss of coolant flow/faulty pump.
2.Faulty exhaust temperature switch.
3.Faulty fire shutdown
-
.
. 1.0illevellow.
2.Faulty oil pressure sendor.
3.0il viscosity incorrect.
Engines & Generators
4