Westerbeke 65A-FOUR - Page 11

ENGINE TROUBLESHOOTING
PROBLEM
PROBABLE CAUSE VERIFICATION/REMEOY
KNOCKING
ENGINE KNOCKS WITHOUT MUCH SMOKE
1. Main engine troubles.
a.Overheated cylinder. a. See OVERHEATING; LOW OUTPUT.
b.Carbon deposits in cylinder. b. Clean.
2. Too early injection timing. 2. Correct.
3. Too high injection pressure.
3. Correct.
4. Improper luel. 4. Replace with proper fuel.
KNOCKING WITH DARK SMOKE
1. Poor compression.
1. See LOW COMPRESSION; HARD STARTING.
2. Injection pump malfunctioning. 2. AdjusVRepair.
3. Improper nozzle.
a. Poor spray. a. Clean or replace nozzle.
b. Poor chattering. b. Repair or replace nozzle.
c. After-injection drip.
c. Repair or replace nozzle.
d. Nozzle needle valve seized.
d. Replace.
INTERMlmNT
1. Fuellilter clogged. 1. Clean or replace.
EKHAUST SOUND 2. Fuel pipe sucks air. 2. Retighten pipe jOints or replace pipe.
3. Water mixed in fuel 3. Replace fuel.
OVERHEATING 1. V-belt slackening or slippery with oil. 1. Adjust, replace or clean.
2. Damaged water pump. 2. Replace.
3. Lack of coolant.
3. Add.
4. Low oil level or poor oil quality. 4. Add or change.
5. Knocking. 5. See KNOCKING.
6. Moving parts seized or damaged.
6. Replace.
7. Defective thermostat. 7. Replace.
LOW OIL PRESSURE
1. Worn Bearings. 1. Engine overhaul replace bearings.
2. Relief valve mallunction.
2. Overhaul oil pump.
3. Clogged oil cooler. 3. Repair.
4. Diesel dilution of the oil. 4. Injection pump repair.
HIGH OIL PRESSURE
1. Wrong type of oil. 1. Replace.
2. Relief valve defective 2. Replace.
RAW WATER IN CYLINDERS
1. Fail of syphon valve or exhaust system .. 1. Clean out, inspect exhaust system, replace.
FUEL MIXING WITH 1. Injection pump broken. 1. Rebuild, replace.
LUBE OIL
2. Injection pump's plunger is worn. 2. Replace.
3. Deficient nozzle injection. 3. Replace nozzle
WATER MIXING WITH
1. Delective head gasket. 1. Replace.
LUBE OIL
2. Cylinder block/cylinder head flawed. 2. Replace.
(continued)
Engines & Generators
6