Komatsu PC400LC-5 Operation & Maintenance Manual page 143

16. TROUBLESHOOTING
ENGINE (cont'd) (16.6.31
Problem Main causes
Exhaust gas is white or blue
l
Too much oil in oil pan
0 Improper fuel
l
Change to specified fuel
Exhaust gas occasionally turns
black
l
Clogged air cleaner element
l
Defective nozzle
l
Defective compression
l
Clean or replace, see WHEN
REQUIRED
(o Replace nozzle)
(o See defective compression
above)
l
Defective turbocharger
l
Clean or replace turbocharger
Combustion noise occasionally
makes breathing sound
Abnormal noise generated
(combustion or mechanical)
l
Defective nozzle
a Low grade fuel being used
l Overheating
l
Damage inside muffler
l
Excessive valve clearance
Remedy
l
Add oil to specified level,
see CHECK BEFORE
STARTING
(o Replace nozzle)
l
Change to specified fuel
l Refer to "Radiator water level
monitor lights up" as above
(o Replace muffler)
(o Adjust valve clearance)
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