Engine Troubleshooting (Charts - Westerbeke 12C-TWO Operator's 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
determining 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.
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~
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.
1. Bleed air from fuel system.
2. Clean or replace filter.
3. Adjust injection pressure.
4. Clean or replace noule.
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.
e. 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. Check preheat circuit.
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. Adjust injection timing.
2. Insufficient injection.
2. Repair or replace injection pump.
3. Low injection pressure. 3. Check injection noule and adjust pressure.
INSUFFICIENT FUEL
1. Air trapped in fuel system. 1. Check and retighten connector.
2. Clogged filter. 2. Clean or replace filter.
3. Contaminated fuel tank. 3. Clean tank.
INSUFFICIENT INTAKE AIR
1. Clogged air cleaner. 1. Clean or replace air cleaner.
(continued)
Engines & Generators
4