DV11
Operation and Maintenance
183
Maintenance of Major Components
Printed in Mar. 2005 PS-MMA0608-E1A
5.1.4 Diagnostics and troubleshooting
Complaints Possible causes Corrections
1. Engine overheating z Lack of coolant z Replenish coolant
z Radiator cap pressure
valve spring weakened
z Replace cap
z Fan belt loosened or
broken
z Adjust or replace fan belt
z Fan belt fouled with oil z Replace fan belt
z Thermostat inoperative z Replace thermostat
z Water pump defective z Repair or replace
z Restrictions in water
passages due to deposit
of scales
z Clean radiator and water
passages
z Injection timing incorrect z Check injection timing by
SCAN-200
z Restriction in radiator core z Clean exterior of radiator
z Gases leaking into water
jacket due to broken
cylinder head gasket
z Replace cylinder head gasket
2. Engine overcooling z Thermostat inoperative z Replace thermostat
z Ambient temperature too
low
z Install radiator curtain
3. Lack of coolant z Radiator leaky z Correct or replace
z Radiator hoses loosely
connected or damaged
z Retighten clamps or replace
hoses
z Radiator cap valve spring
weakened
z Replace cap
z Water pump leaky z Repair or replace
z Heater hoses loosely
connected or broken
z Tighten or replace hoses
z Cylinder head gasket
leaky
z Replace cylinder head gasket
z Cylinder head or cylinder
block cracked
z Replace cylinder head block
4. Cooling system
noisy
z Water pump bearing
defective
z Replace bearing
z Fan loosely fitted or bent z Retighten or replace fan
z Fan out of balance z Replace fan
z Fan belt defective z Replace fan belt
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