Troubleshooting Guide - Westerbeke 8.0KW-60Hz Service Manual

TROUBLESHOOTING GUIDE
The following engine troubleshooting guide may
be
helpful in
detennining if a complete or partial overhaul is necessary.
Insomclen! Power
InsuHlclen! Compression
Compression leakage from valve seat
Seized valve stem
Weak or broken valve spring
Burned cylinder head gasket
Cracked or distorted cylinder head
Sticking, damaged, or worn piston
ring
Cracked or worn piston
Malfunction of Fuel System
Malfunction ollgnllion System
Excessive 011 Consumption 011 Worklng Up
Worn or sUcking piston ring or piston
ring groove
Worn plslon or cylinder
011 Worklng Down
Bad valve seal
Worn valve stem or guide
011 Leakage
Dlfllcull starting Malfunction 01 Englne-relaled
Components
Burned valve
Worn pislon, plslon ring, or cylinder
Burned cylinder head gasket
Mallunctlon 01 Fuel System
Mallunction of Electrical System
Abnonnal Combusllon
Mallunction of Engine-mlaled
Components
SUcking or burned valve
Weak or broken valve spring
Carbon accumulated in
combusllon chamber
Malfuncllon 01 Fuel Syslem
Mallunctlon ollgnillon Syslem
Poor Idling
Mallunctlon of Englne-mlaled
Components
Poor valve-to-valve seal contact
Failure of cylinder head gasket
Malfunction of Fuel Syslem
Malfunction of Ignition
System
Engine Noise
Crankshaft or bearing mlaled
parts .
Excessive main bearing oil clearance
Main bearing seized or heat damaged
Excessive crankshaft end play
Excessive connecting rod bearing oil
clearance
Connecting rod bearing seized or hea
damaged
Piston mlaled parts
Worn Cylinder
Worn piston or piston pin
Seized plstpn
Damaged piston ring
Bent Connecting Rod
Malfuncllon ollgnilion Syslem
Valve or timing relaled parts
Malfunction of HLA
*
Broken valve spring
Excessive clearance between valve
stem and guide
InsuHlcient lubrication of rocker arm
Others
Malfunction of water pump bearing
Malfunction of attemator bearing
Malfunction of timing belt tensioner
Engine Misfires Poor quality fuel.
Incorrect timing.
Dirty flame arrester.
Cracked distributor cap.
Faulty Ignnlon wires.
Spark plugs are worn.
High exhaust back-pressure.
Valve clearances are incorrect.
Engine Backfires Spark plug wires are connected
wrong.
Incorrect timing.
Engine is flootiad.
Dirty flame arrester.
Cracked distributor cap.
High exhaust back-pressure.
Choke Is stuck closed.
*
Tapet noise
may
occur
if
the engine is not operated for a
period of time. Tapet noise should stop within J 0 minutes
after operating the engine.
Engln"s.
&
Generators
4