Westerbeke 3.0 BPMG - Startup, Shutdown, and Performance Troubleshooting

TROUBLESHOOTING GUIDE
PROBLEM
PROBABLE CAUSE
Blue EXhaust Smoke Discharge 1. Lube oil is diluted.
from the Engine
2. High lube oil level.
3. Crankcase breather hose is clogged.
4. Valves are worn or adjusted incorrectly.
5. Piston rings are worn or unseated.
Black exhaust smoke Discharge 1. Dirty flame arrester.
from the Engine
2. Faulty carburetor.
3. Idle mixture jet too rich.
4. Accelerator diaphragm leaking.
5. Valves are worn or incorrectly adjusted.
6. Piston rings are worn or unseated.
Poor performance 1. Contaminates in carburetor.
at generator speed
2. Faulty fuel pump/contaminated.
3. Electronic governor controller needs
adjustment.
Starter stays energized 1. Faulty MPU suspected. Check MPU.
after start
2. Faulty starter solenoid.
Unit starts and runs
1. Check MPU signal. 1.5 - 2.0 VAC cranking.
at idle speed
2. Faulty overspeed board.
Engine starts, runs for a few 1. Faulty MPU.
seconds then overspeeds and
2. Faulty Control PC Board
shuts down
Engine starts, but shuts down. 1. Control PC Board.
Will stay running if start switch
is kept depressed
NOTE: MPU voltages to PC board:
Cranking: 1.5 - 2.0 VAC
Running: 4.0 - 5.0 VAC
(2200rpm)
BY-PASSING THE OVERSPEED BOARD
A faulty Overspeed PC Board can be the cause of an
unwanted shutdown. It can also be the cause when the
engine is started and runs for
10 - 15 seconds and then
shuts down.
1. Refer to the Wiring Diagram in this manual.
2.
Unplug the brown #6 wire that connects between
pin #12 of the 15 pin plug connector and the ignition
module.
The wire plug connection is in the harness
between the two components.
3. Without unplugging any connections on the coil relay,
place a
jumper between connection #30 and #87.
4. Manually controlling #30 and #87, start the engine
physically controlling the actuator/throttle keeping the
engine speed
at a low comfortable range. If the engine
continues to run more than
15 seconds, a faulty
overspeed board exists.
NOTE: 17ie above should only be pe1f ormed as a test. 17ie
generator with a by-passed overspeed board should not be
nm under nonnal use. 17iis can present a hazard.
31
!