DETROIT DIESEL 53
15.2 Trouble Shooting (Engine)
Check the flow of coolant through the radiator. A
1. Clean the cooling system with a good cooling system
clogged radiator will cause an inadequate supply of
cleaner and thoroughly flush to remove scale deposits.
coolant on the suction side of the pump. Clean the
Clean the exterior of the radiator core to open plugged
passages and permit normal air flow.
Remove the coolant filler cap and operate the engine,
Adjust fan belts to the proper tension to prevent
checking for combustion gases in the cooling system.
The cylinder head must be removed and inspected for
cracks and the head gaskets replaced if combustion
Check for an improper size radiator or inadequate
gases are entering the cooling system.
Check for an air leak on the suction side of the water
Repair or replace inoperative temperature-controlled
pump. Replace defective parts.
fan or inoperative shutters.
2. Check the coolant level and fill to the filler neck if
3. The thermostat may not be closing. Remove, inspect
the coolant level is low.
and test the thermostat. Install a new thermostat, if
Inspect for collapsed or disintegrated hoses. Replace
Check for an improperly installed heater.
Thermostat may be inoperative. Remove, inspect and
4. Excessive leakage of coolant past the thermostat
test the thermostat; replace if found faulty.
seal(s) is a cause of continued low coolant operating
temperature When this occurs. replace the thermostat
Check the water pump for a loose or damaged