Komatsu D85EX-18 Operation & Maintenance Manual page 287

OPERATION
Problem
Steam spurts out from top of radiator.
(pressure valve)
Engine coolant temperature caution
lamp lights up.
Starting motor turns but engine does
not start
Exhaust gas color is white or bluish.
Exhaust gas sometimes becomes
black.
Combustion sound sometimes fluctu-
ates
Unusual noise is generated.
(combustion or mechanical)
Main causes
Lowered coolant level, leakage of
coolant
Dirt or scale accumulated in cooling
system
Clogged radiator fins or damaged fin
Defective thermostat
Loosened radiator filler cap (in high
altitude operation)
Defective monitor
Lowered coolant level, leakage of
coolant
Dirt or scale accumulated in cooling
system
Clogged radiator fins or damaged fin
Defective thermostat
Loosened radiator filler cap (in high
altitude operation)
Defective monitor
Lack of fuel
Air in fuel system
No fuel in fuel filter
Starting motor incapable of cranking
engine smoothly.
Defective compression
(Defective valve clearance)
Excessive oil in oil pan
Improper fuel
Water entry in KDPF
Broken KDPF
Broken KDPF
Defective nozzle.
Low grade fuel being used
Overheating
Broken inside of KDPF
Excessive valve clearance
TROUBLES AND ACTIONS
Remedy
Check, add coolant, repair. See
CHECK BEFORE STARTING.
Change coolant, flush inside of cool-
ing system. See WHEN REQUIRED.
Clean or repair. See WHEN RE-
QUIRED.
Replace thermostat. (*)
Tighten cap or replace packing.
Replace monitor. (*)
Check, add coolant, repair. See
CHECK BEFORE STARTING.
Change coolant, flush inside of cool-
ing system. See WHEN REQUIRED.
Clean or repair. See WHEN RE-
QUIRED.
Replace thermostat. (*)
Tighten cap or replace packing.
Replace monitor. (*)
Add oil to specified level. See
CHECK BEFORE STARTING.
Repair portion where air is sucked in.
Fill fuel filter with fuel. See EVERY
500 HOURS MAINTENANCE. (*)
See "PHENOMENA AND ACTIONS
FOR ELECTRICAL SYSTEM".
Adjust valve clearance. (*)
Add oil to specified level. See
CHECK BEFORE STARTING.
Replace with specified fuel.
Check and repair. (*)
Replace KDPF. (*)
Replace KDPF. (*)
Replace nozzle.
Replace with specified fuel.
Refer to "Engine coolant temperature
caution lamp lights up" shown above.
Replace KDPF. (*)
Adjust valve clearance. (*)
3-233