Engine Troubleshooting - Westerbeke 8.0KW-60Hz Service 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.'This chart may be of assistance in determin-
ing the need for an engine overhaul.
NOTE: The engine's electrical system
is
protected by a 20-
PROBLEM
HARD STARTING
LOW OUTPUT
. ampere manual reset circuit breaker. The preheat solenoid is
mounted on the same bracket.
PROBABLE CAUSE VERIFICATION/REMEDY
LOW CRANKING SPEED
1. Engine 011 viscosity too high. 1. Replace engine oil with less viscous 011.
2. Run-down battery.
2. Recharge battery.
3. Worn battery.
3. Replace battery.
4. Battery terminals loosely connected. 4. Clean terminals and correct cables.
5. Defective starter.
5. Repair or replace starter.
6. Defective main drive section. 6. Check clutch for disengagement.
DEFECTIVE INJECTION SYSTEM
1. Air trapped in fuel passage.
1. Bleed air from fuel system.
2. Clogged fuel filter.
2. Clean or replace filter.
3. Low injection pressure. 3. Adjust Injection pressure.
4. Inadequate spray. 4. Clean or replace nozzle,
5. Injection pump delivering insufficient fuel. 5. Repair or replace injection pump.
6. Injection too early. 6. Adjust injection timing.
MAIN ENGINE TROUBLES
1. Low compression.
a. Incorrect valve clearance. a. Adjust valve clearance.
b. Inadequate contact of valve seat. b. Lap valve.
c. Valve stem seized.
c. Replace valve and valve guide.
d. Broken valve spring.
d. Replace valve spring.
e. Compression leaks through cylinder head gasket. e. Replace gasket.
t . Piston ring seized. t 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 posnion.
4. Set lever to starting position.
5. Governor spring out of POSITION
5. Correct spring
lOW COMPRESSION See HARD STARTING
INJECTION SYSTEM OUT OF ADJUSTMENT
1. Incorrect injection timing.
.
1. Adjust injection timing.
2. Insufficient injection. 2. Repair or replace injection pump.
3. Low injection pressure.
3. Check injection nozzle and adjust pressure.
INSUFFICIENT FUEL
1. Airtrapped in fuel system. 1. Check and retighten connector.
2. Clogged filter. 2. Clean or repiace filter.
3. Contaminated fuel tank. 3. Clean tank.
INSUFFICIENT INTAKE AIR
1. Clogged air cleaner. 1. Clean or repiace air ~ieaner.
(continued)
Engines & Generators
5