Westerbeke W-27 Service Manual

ENGINE TROUBLESHOOTING
The following troubleshooting table describes certain
problems relating to engine service, the probable causes
of
these problems, and the recommendations to overcome
these problems.
Note: The engine s electric..al system is protected by a 20-
ampere manual reset circuit breaker located on a bracket on
the left front side
of the engine. The preheat solenoid is
mounted on the same bracket.
PROBLEM
PROBABLE CAUSE VERIFICATION/REMEDY
HARD STARTING LOW CRANKING SPEED
1. Engine oil viscosity too high. 1. Replace engine oil with less viscous oil.
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.
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 glow plugs and solenoid.
4. Incorrect governor lever position.
4. Set lever to starting position.
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 nozzle 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
12

Westerbeke W-27 Specifications

General

Brand	Westerbeke
Model	W-27
Category	Engine
Language	English