D1146/D1146TI/DE08TIS
MAINTENANCE MANUAL
101
Printed in Jan. 2001 PS-MMA0415-E1A
4.1.4. 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 Adjust injection timing
correctly
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 or
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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