Westerbeke 9.0 BCG Technical Manual page 168

Cooling System Troubleshooting
Trouble Possible Cause Remedy
Coolant leaks: It is recommended that when trying to locate a leak in the cooling system that the system be
pressure tested using a commercially available pressure tester such as the STANT #ST255. Follow instruc-
tions with the tester. Locate and correct the leak.
Overheating (Fresh
Water System)
Overheating (Sea
Water System)
2. Leaking pressure
cap.
3. Faulty plastic
coolant recovery
tank.
1. Insufficient
coolant.
2. Loose or broken
water pump drive
belt.
3. Faulty thermostat
4. Faulty overheat
switch.
5. Scale and sediment
in cooling system.
6. Faulty circulating
pump.
1. Loose or broken sea
water pump drive
belt.
2. Faulty sea water
pump.
3. Clogged heat
exchanger.
4. Scale in exhaust..
2. Test with above unit
and/or replace.
3. Check and tighten con-
nections or replace
tank or hose.
1. Replenish coolant and
check for cause of
loss.
2. Adjust or replace.
3. Remove and replace.
4. Remove and replace.
5. Flush engine cooling
system and heat ex-
changer; replenish coolant.
6. Remove and replace.
1. Adjust or replace.
2. Check sea water pump
for wear, defective
impeller. Repair or
replace as needed.
3. Remove exchanger,
clean and flush.
4. Remove elbow and clean
Other causes of engine overheating may be caused from faults in the sea water circuit supplying coolant to
the sea water pump on the engine. Examine the off circuit for possible contributing faults.
Westerbeke Generators
162