Westerbeke 38B FOUR Service Manual page 19

ENGINE TROUBLESHOOTING
PROBLEM PROBABLE CAUSE VEmFICATION/REMEDY
LOW OUTPUT
(cont.)
OVERHEATING
1. Low coolant level. 1. Add coolant.
2. Loose V-belt.
2. Adjust or replace V~belt.
3. Incorrect injection timing. 3. Adjust injection timing.
4. Low engine oil level. 4. Add engine oil.
EXCESSIVE OIL OIL LEAKAGE
CONSUMPTION
1. Defective oil seals. 1. Replace oil seals.
2. Broken gear case gasket. 2. Replace gasket.
3. Loose gear case attaching bolts. 3. Retighten bolts.
4. Loose drain plug. 4. Retighten plug.
5. Loose oil pipe connector. 5. Retighten oil connections.
6. Broken rocker cover gasket. 6. Replace gasket.
7. Loose rocker cover attaching bolts. 7. Retighten attaching bolts.
OIL LEVEL RISING
1. Incorrectly positioned piston ring gaps. 1. Correct ring gap positions.
2. Displaced or twisted connecting rod. 2. Replace connecting rod.
3. Worn piston ring. 3. Replace ring.
4. Worn piston or cylinder.
4. Replace piston and rebore cylinder.
OIL LEVEL FALLING
1. Defective stem seal. 1. Replace stem seal.
2. Worn valve and valve guide. 2. Replace a valve and valve guide.
EXCESSIVE FUEL ENGINE BODY TROUBLES
CONSUMPTION 1. Noisy knocking. 1. See KNOCKING.
2. Smoky exhaust. 2. See SMOKY EXHAUST.
3. Moving parts nearly seized or excessively worn.
3. Repair or replace.
4. Poor compression.
4. See LOW COMPRESSION; HARD STARTING.
5. Improper valve timing. 5. Adjust.
6. Improper valve clearance. 6. Adjust.
INSUFFICIENT INTAKE AIR
1. Air intake obstructed.
1. Clean or remove obstruction.
NOZZLE TROUBLES
1. Seized nozzle. 1. Replace.
2. Worn nozzle. 2. Replace.
IMPROPER FUEL Replace with proper fuel.
FUEL LEAKS Find fuel leaks.
SMOKY EXHAUST WHITISH OR PURPLISH
1. Excessive engine oil. 1. Correct oil level.
2. Excessive rise of oil into combustion chamber.
a. Poor piston contact. a. Check.
b. Seized piston ring. b. Replace or clean.
c. Excessive piston-to-cylinder clearance. c. Replace or correct.
(continued)
Engines & Generators
13