10.1.3. Diagnostics and troubleshooting
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Complaints
Possible causes
Corrections
1. Engine overheating
•
Lack of coolant
•
Replenish coolant
•
Radiator cap pressure
•
Replace cap
valve spring weakened
•
Fan belt loosened or broken
•
Adjust or replace fan belt
•
Fan belt fouled with oil
•
Replace fan belt
•
Thermostat inoperative
•
Replace thermostat
•
Water pump defective
•
Repair or replace
•
Restrictions in water passages
•
Clean radiator and water
due to deposit of scales
passages
•
Injection timing incorrect
•
Adjust injection timing correctly
•
Restriction in radiator core
•
Clean exterior of radiator
•
Gases leaking into water jacket
•
Replace cylinder head gasket
due to broken cylinder head
gasket
2. Engine overcooling
•
Thermostat inoperative
•
Replace thermostat
•
Ambient temperature too low
•
Install radiator curtain
3. Lack of coolant
•
Radiator leaky
•
Correct or replace
•
Radiator hoses loosely
•
Retighten clamps or replace
connected or damaged
hoses
•
Radiator cap valve spring
•
Replace cap
weakened
•
Water pump leaky
•
Repair or replace
•
Heater hoses loosely
•
Tighten or replace hoses
connected or broken
•
Cylinder head gasket leaky
•
Replace cylinder head gasket
•
Cylinder head or cylinder block
•
Replace cylinder head block
cracked
4. Cooling system noisy
•
Water pump bearing defective
•
Replace bearing
•
Fan loosely fitted or bent
•
Retighten or replace fan
•
Fan out of balance
•
Replace fan
•
Fan belt defective
•
Replace fan belt
