Westerbeke 7.0 KW BGC -60Hz Technical Manual page 126

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
instructions with the tester. Locate and correct the leak.
Overheating (Fresh
Water System).
Overheating (Raw
Water System).
1. Leaking pressure
cap.
2. 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 raw
water pump drive belt.
2. Faulty raw water
pump.
3. Clogged heat
exchanger.
4. Scale in exhaust elbow.
1. Test with above unit
and/or replace.
2. 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 raw water pump
for wear and/or 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 raw water circuit supplying coolant
to the raw water pump on the engine. Examine the off circuit for possible contributing faults.
Westerbeke Generators 122