Westerbeke 65A-FOUR Operator's Manual page 35

ENGINE TROUBLESHOOTING
Problem
Probable Cause
Verification/Remedy
Engine slows and stops. 1. Fuel lift pump failure.
1.
Fuel lift pump should make a distinct ticking sound. Replace
pump with spare.
2. Switches and/or wiring loose
2. Inspect wiring for short circuits and loose connections.
or disconnected.
Inspect switches for proper operation.
3. Fuel starvation.
3. Check fuel supply, fuel valves, fuel lift pump.
4. 20 Amp circuit breaker tripping.
4. Check for high DC amperage draw during operation.
Ensure breaker is not overly sensitive to heat which would
cause tripping.
5. Exhaust system is restricted.
5. Check for blockage, collapsed hose, carbon buildup at
exhaust elbow.
6. Water in fuel.
6. Pump water from fuel tank(s); change filters and
.
bleed fuel system .
7.
Air intake obstruction. 7.
Check air intake
Engine overheats/shuts down. 1.
Raw water not circulating. 1.
Raw water pump failure. Check impeller- replace.
2. Coolant not circulating. 2. Obstruction at raw water intake or raw water filter.
2a. Thermostat- remove and test in hot water.
Replace thermostat.
2b. Loss of coolant- check hoses, hose clamps, drain plug, etc.
for leaks.
2c. Broken or loose belts- tighten/replace.
2d. Air leak in system; run engine and open the pressure cap to
bleed air. Add coolant as needed.
Engine alarm sound pulsates.
1. Loss of all. 1. Check dipstick, look for oil leaks at oil filter and at
oil drain hose connection.
2. OH pressure switch.
2. Replace oil pressure switch.
Engine alarm sounds continuously. 1. Engine coolant. 1. Check engine coolant level.
2. High temperature switch opens at .
2. Check for satisfactory operation with switch bypassed,
too low a temperature.
check with ohmmeter, replace if faulty.
Exhaust smoke problems
1. Blue smoke.
1. Incorrect grade of engine oil.
1a. Crankcase is overfilled with engine oil (oil is blowing out
through the exhaust).
2. White smoke. 2. Engine is running cold.
2a. Faulty injector or incorrect injector timing.
3. Black smoke.
3. Improper grade of fuel.
3a. Fuel bum incomplete due to high back-pressure in exhaust or
insufficient air for proper combustion (check for restrictions in
exhaust system; check air intake).
3b. Improperly timed injectors or valves, or poor compression.
3c. Lack of air- check air intake Check for proper
ventilation.
3d. Overload.
TROUBLESHOOTING WATER TEMPERATURE AND OIL PRESSURE GAUGES
If
the gauge reading is other than what is normally 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-)
terminals of the gauge.
Assuming that tl1ere is 12 volts as required, leave the
instrument panel energized and perform the following steps:
1._ Disconnect the sender wire at the gauge and see if tlle
gauge reads zero, which is tlle normal reading for tllis
situation.
2. Remove the wire attached to the sender terminal at tl1e
gauge and connect
it
to ground. See if the gauge reads full
scale, which is the normal reading for tllis situation.
If botl1 of the above gauge tests are positive, the gauge is
undoubtedly OK and tlle problem lies either with the
conductor from the sender to the gauge or with tl1e sender.
If either of the above gauge tests are negative, tl1e gauge is
probably defective and should be replaced.
Assuming tlle gauge is OK, check tl1e conductor from the
sender to the sender terminal at the gauge for continuity.
Check tha,t the engine block is connected to ilie ground.
Some starters have isolated ground tenninals and if the
battery is cotmected
to
the starter (both plus and minus
terminals), the ground side will not necessarily be connected
to tlle block.