Westerbeke 8.0KW-60Hz Service Manual page 13

PROBLEM
KNOCKING
INTERMITTENT
EXHAUST SOUND
OVERHEATING
LOW DlL PRESSURE
ENGINE TROUBLESHOOTING
PROBABLE CAUSE
.'
ENGINE KNOCKS WITHOUT MUCH SMOKE
1. Main engine troubles.
a. Overheated cylinder.
b. Carbon deposits in cylinder.
2. Too early'lnjectlon timing.
3. Too high Injection pressure.
4. Improper fuel.
KNOCKING WITH DARK SMOKE
1. Poor compression.
2. Injection pump malfunctioning •.
3. Improper nozzle.
a. Poor spray.
b. Poor chattering.
c. After-injection drip.
d. Nozzle needle valve seized.
1. Fuel filter clogged.
2. Fuel pipe sucks air.
3. Water mixed in fuel
1. V-belt slackening or slippery with 011.
2. Damaged water pump.
3. Lack of coolant.
4. Low oil level or poor oil quality.
5. Knocking.
6. Moving parts seized or damaged.
7. Defective thermostat.
1. Worn Bearings.
2. Relief valve malfunction.
3. Clogged 011 cooler.
4. Diesel dilution of the 011.
VERIFICATION/REMEDY
a.
See OVERHEATING; LOW OUTPUT.
b. Clean.
2. Correct.
3. Correct.
4. Replace with proper fuel.
1. See LOW COMPRESSION; HARD STARTING.
2. Adjust/Repair
a. Clean or replace nozzle.
b. Repair or replace nozzle.
c. Repair or replace nozzle.
d. Replace.
1. Clean or replace.
2. Retighten pipe jOints or replace pipe.
3. Replace fuel.
1. Adjust, replace or clean.
2. Replace.
3. Add.
4. Add or change.
5. See KNOCKING.
6. Replace.
7. Replace.
1. Engine overhaul replace bearings.
2. Overhaul 011 pump.
3. Repair.
4. Injection pump repair.
LCD DISPLAY FAULTS
(continued)
Engines .&. Generators
8
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