Installation manual

ENGINE TROUBLESHOOTING
Problem Probable Cause Verification/Rumedy
Engine slows and stops,
1.
Fuellift pump failure, 1. Fueilift 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, and fuel filters.
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 filter cartridge.
Engine overheal5/a~rm sounds steadY, 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.
2 •• Thermostat - remove and test in hot water.
Replace thermostat.
2b. Loss of coolant - check hoses, hose clamps, drain plug, etc.
for leaks.
2 •• 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 oil. 1.
Check dipstick, look for oil leaks at oil filter and at
oil drain hose connection.
2.
Oil pressure switch, 2.
Replace oil pressure switch.
3.
Engine coolant. 3. Check engine coolant level.
4. High temperature switch opens at. 4.
Check for satisfactory operation with switch bypassed,
too Iowa temperature.
check with ohmmeter, replace if faulty.
, Exhaust smoke problems
1.
Bluesmoke. 1. Incorrect grade of engine oil . .
la. Crankcase is overtilled 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 grada 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.lmproperly timed injectors or valves, or poor compression.
3 •• Lack of air - check air intake and air filter. Check for proper
ventilation.
3d. Overload.
TROUBLESHOOTING COOLANT 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 there 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 the
gauge reads zero, which is the normal reading for this
situation.
2. Remove the wire attached to the sender tenninal at the
sender and
connect it to ground. See if the gauge reads
full scale, which is the normal reading for this situation.
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.
'WIY' WESTERBEKE
Engines & Generators
34