Engine Troubleshooting - Westerbeke 11.5KW-60Hz Service Manual

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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.This chart may be of assistance in determin-
ing the need for an engine overhaul.
PROBLEM PROBABLE CAUSE
HARD STARTING LOW CRANKING SPEED
1. Engine oil viscosity too high.
2. Run-down battery.
3. Worn battery.
4. Battery terminals loosely connected.
5. Defective starter.
6. Defective main drive section.
DEfECTIVE INJECTION SYSTEM
1. Air trapped in fuel passage.
2. Clogged fuel filter.
3. Low injection pressure.
4. Inadequate spray.
5. Injection pump delivering insufficient fuel.
6. Injection too early.
MAIN ENGINE TROUBLES
1. Low compression.
a. Incorrect valve clearance.
b. Inadequate contact of valve seat.
c. Valve stem seized.
d. Broken valve spring.
NOTE:
The engine's electrical system is protected by a 20-
ampere manual reset circuit breaker. The preheat solenoid is
mounted on the same bracket.
VERIFICATION/REMEDY
1. Replace engine oil with less viscous oil.
2. Recharge battery.
3. Replace battery.
4. Clean terminals and correct cables.
5. Repair or replace starter.
6. Check clutch for disengagement.
1. Bleed air from fuel system.
2. Clean or replace filter.
3. Adjust injection pressure.
4. Clean or replace nozzle.
5. Repair or replace Injection pump.
6. Adjust injection timing.
a. Adjust valve clearance.
b. Lap valve.
c. Replace valve and valve guide.
d. Replace valve spring.
o. Compression leaks through cylinder head gasket. e. Replace gasket.
f.
Piston ring seized.
f.
Replace piston and piston ring.
g. Worn piston ring and cylinder. g. Overhaul engine ..
2. Burnt glow plug. 2. Replace glow plug.
3. Faulty glow plug operation. 3. Correct lead wire connection.
4. Incorrect governor lever position. 4. Set lever to starting position.
5. Governor spring out of POSITION 5. Correct spring
LOW OUTPUT
LOW COMPRESSION See HARD STARTING
INJECTION SYSTEM OUT OF ADJUSTMENT
1. Incorrect injection timing. 1. AdjustinjoClion timing.
2. Insufficient injection. 2. Repair or replace Injection pump.
3. Low injection pressure. 3. Check Injection nozzle and adjust pressure.
INSUFFICIENT FUEL
1. Air trapped in fuel system. 1. Check and retighten connector.
2. Clogged filter. 2. Clean or replaee filter.
3. Contaminated fuel tank. 3. Clean tank.
INSUFFICIENT INTAKE AIR
1. Clogged air cleaner.
1. Clean or replace air cleaner.
(continued)
""" WESTERBEKE
Engines
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