Engine Troubleshooting - Westerbeke 7.6 EGTD Operator's Manual

ENGINE TROUBLESHOOTING
The following troubleshooting chart describes certain
problems relating to engine service, the probable causes of
these problems, and the recommendations
to
overcome
these problems .If the engine shuts down
(Check Engine/LED
is illuminated),
refer to ECU Troubleshooting Chart in this
manual.
PROBLEM
PROBABLE CAUSE
Engine can not be stopped. 1. Faulty DC aHernator.
Starting battery not being.
1. DC charge circuit faulty.
2. Alternator drive.
Engine slows and stops. 1. Fuel starvation.
2. Contaminated fuel.
3. Exhaust restriction.
Engine overheats and
shuts down. 1. Antifreeze coolant not circulating.
Preheat switch depressed 1. Battery switch off.
No panel indications or 2. 20 Amp breaker tripped.
electrical fuel pump. 3. Emergency stop switch open.
4. 7.5 amp fuse fauHy.
5. Blocking diode open.
6. K2 Relay faulty.
Start switch depressed 1. K1 Relay fauHy.
No starter activation. 2. FauHy starter solenoid.
3. Low DC battery charge.
4. Poor/loose battery cable connection.
If the gauge reading is other than what is nonnalty indicated
by the gauge when the instrument panel is energized, the first
step is to check for 12 volts DC between the ignition
and
the Negative
(B-)
terminals of the gauge.
Assuming that there
is
12 volts as required, leave the
instrument panel energized and perform the following
1.
Disconnect
the
sender
wire at
the gauge and see if the
gauge reads zero, which is the normal reading for this
situation.
2. Remove
the
wire attached to the sender on the engine
and
ground
it
to the engine. The gauge in the panel
should
register
full scale, which is nonnal for this
situation. DC voltage
at
the oil
and
temperature sender
to ground when
the
engine is first started will be high
(10 - 11
VDC)
and will
fall
as the oil pressure rises
and
NOTE:
The engine :s-
electrical syste~ is protected by a 20-
ampere manual reset circuit breaker. The preheat solenoid is
mounted on the same bracket.
VERIFICATION/REMEDY
1. Remove Exc/R connection off aHernator. Repair
alternator.
1. Perform DC voltage check of charge circuit See DC
alternator section in this manual.
2. Check drive belt tension, loose connections, voltage
output, excitation voltage present at Exo/R terminal.
1. Check fuel supply, filters, tank vent.
2. Check filters tor contaminates/water.
3. Check for blockage, collapsed exhaust hose, carbon
build up in water injected exhaust elbow.
1. Loss of coolant. Check system for leak.
2. Air in system. Expel air. Add coolant as needed.
Check recovery circuit.
3. Thermostat stuck closed. Check/test/replace.
1. Check switch.
2. Check/re-set 20 amp breaker.
3. Check/close switch.
4. Check/test fuse.
5. Test diode.
6. Check/test K2 Relay.
1. Check/test K1 Relay.
2. Test solenoid.
3. Check battery charge state.
4. Check connections.
coolant rises. This
DC
voltage
will
generally stabilize
in
the
5 -
7VDC
range depending
on what
your engines
nonnal oil pressure and coolant temperature are
If boih
of the above gauge tests are positive,
the
gauge is
undoubtedly OK and the problem lies either with
the
conductor from the sender
to
the gauge or with
the
sender.
If either the above gauge
tests
are negative,
the
gauge is
probably defective and should be replaced.
Assuming the gauge is OK, check the conductor
from the
sender to
the
sender
terminal at the
gauge for continuity.
Check that
the
engine block is connected to
the
ground
Some starters have isolated ground terminals
and
if
the
battery is connected to the starter (both plus and minus
terminals), the ground side
will
not
necessarily be connected
to
the block.
Engines
&
Gsnsratont
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