Westerbeke Universal M3-20B User Manual

CONTROL PANEL TROUBLESHOOTING
MANUAL STARTER DISCONNECT (TOGGLE SWITCHES)
NOTE: The engine control system is protected by a 20 amop manual reset circuit breaker
located on the engine as close as possible to the power source.
Problem
Probable Cause
Verificallon/Remedy
PREHEAT depressed. no panel indications 1. Oil Pressure switch.
1.
Check switches and/or battery connections.
fuel solenoid, electric fuel pump and
preheat solenoid not energized. 2. 20 amp circuil breaker tripped.
2. Reset breaker. If opens again, check preheat solenoid circuil
and run circuit for shorts to ground.
START SWITCH DEPRESSED. no starter 1. Connection to solenoid faulty.
1.
Check connection.
engagement.
2.
Faulty switch
2.
Check switch with ohmmeter.
3. Faulty solenoid.
3.
Check that 12 volts are present at the solenoid connection.
4.
Loose battery connections.
4.
Check battery connections.
5.
Low batteI)'.
5.
Check battel)' charge state.
NO tGNITION. cranks. does not start. 1.
Faulty fueling system.
1.
Check for fuel.
2.
Check for air in the fuel system.
2.
Allow system to bleed.
3.
Faulty fuel lift pump.
3.
Replace fuel lift pump.
NOT CHARGING BATTERY 1.
Faulty alternator drive.
1.
Check the drive belt and its tension. Be sure the alternator
turns freely. Check for loose connections. Check the
output with a voltmeter. Ensure 12V are present at the
regulator terminal.
BATTERY RUNS DOWN 1. Oil pressure switch.
1.
Observe if the gauges and panel lights are activated when the
engine is not running. Test the oil pressure switch.
2.
High resistance leak to ground.
2.
Check the wiring. Insert sensitive (0-.25 amp) meter in bat1ery
lines (Do NOT start engine). Remove connections and replace
after short is located.
3.
Low resistance leak to ground.
3.
Check all wires for temperature rise to locate the fault.
4. Faulty alternator.
4.
After a good bat1ery charging, disconnect alternator at output.
If leakage stops. Remove alternator and bench test. Repair or
replace.
ALARM BUllER SOUNDING
1. Resistor shorting.
1.
Check resistor 1000 ohm. resistor found between preheat
(Oil pressure nonnal) solenoid "I" terminal and ground.
2. Fuel pump.
2.
Fuel pump coils shorting.
3.
Oil pressure switch.
3.
Oil pressure switch internal contacts not closing properly.
TROUBLESHOOTING WATER TEMPERATURE AND OIL PRESSURE GAUGES
If the gauge reading is other than what is nonnally indicated
by the gauge when the instrument panel is energized, the first
step is to check for 12 volts
DC between the ignition (B+)
and the Negative (B-) tenninals
of the gauge.
Assuming that there is
12 volts as required, leave the
instrument panel energized (key switch on) and perfonn the
following steps:
1. Disconnect the sender wire at the gauge and see if the
gauge reads zero, which is the nonnal reading for this
situation.
2. Connect the sender terminal at the gauge to ground and
see
if the gauge reads full scale, which is the nonnal reading
for this situation.
31
If both 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 of 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 tenninal at the gauge for continuity.
Check that the engine block is connected to the ground.
Some starters have isolated ground tenninals and if the
battery
is connected to the starter (both plus and minus
tenninals), the ground side will not necessarily be connected
to the block.

Westerbeke Universal M3-20B Specifications

General

Brand	Westerbeke
Model	Universal M3-20B
Category	Engine
Language	English