Komatsu Utility 395F6001, Operation & Maintenance Manual

Page: 167 / 254

OPERATIONS IN CASE OF FAILURE
165
3.14.5.5 ENGINE
TROUBLE CAUSE REMEDY
Oil pressure warning light remains on
even with engine at high speed: • Oil level in oil pan too low.
• Oil filter clogged.
• Oil unsuitable for the season. • Top up.
• Change filter.
• Change.
Steam comes out of radiator breather
pipe:
• Fluid level low, fluid leakages.
• Fan belt slack.
• Radiator fins damaged or closed.
• Faulty thermostat.
• Radiator cap loose or broken.
Working at considerable altitude.
• Top up, repair.
• Check belt tension.
• Repair or clean.
(•) Change.
• Tighten cap or change unit.
Temperature indicator always on the
right end of the scale: • Faulty temperature indicator. (•) Change
Temperature indicator pointer always
on the left end of the scale: • Faulty thermostat.
• Faulty indicator. (•) Change.
(•) Change.
Engine does not start: • Battery down.
• Battery terminals loose or corroded.
• No fuel.
•
Type of fuel unsuitable for climate.
•
Air in fuel supply circuit.
• Other causes.
(•) Charge or replace.
(•) Tighten nuts or change terminals.
• Refuel.
(•) Change filter.
Refuel with winter type.
(•) Check pipes, connections, fuel and
injection pumps.
Bleed the circuit.
(•) Contact Dealer.
Engine stops: • Fuel filters clogged.
• Air in fuel supply circuit.
• Other causes.
(•) Change.
(•) Check pipes, connections, fuel and
injection pumps.
Bleed the circuit.
(•) Contact Dealer.
Engine overheats: • Radiator clogged.
• Insufficient tension of water pump
and fan belt.
• Low coolant.
• Air filters clogged.
• Clean fins.
(•)
Check and adjust belt tension.
• Top up.
(•) Clean or change filters.
Engine power insufficient: • Impurities or water in fuel supply
circuit.
• Fuel filter clogged.
• Air filter clogged.
(•)
Clean and refuel with new fuel.
(•) Change.
(•) Clean or change filters.
Exhaust gases white or light blue: • Too much oil in oil pan.
• Unsuitable fuel.
• Other causes.
• Restore correct level.
• Change with fuel in compliance with
standards.
(•) Contact Dealer.
Exhaust gases occasionally tend to be
black: • Air filter clogged.
• Faulty injectors. • Clean or change.
(•) Change.
Combustion noise occasionally resem-
bles a blow: • Faulty injectors. (•) Change.
Abnormal noises (during combustion or
in mechanical parts): •
Fuel with low cetane rating.
•
Overheating.
• Exhaust silencer inside damaged.
•
Excessive valve clearance
.
• Change with fuel in compliance with
standards.
• See “defects of temperature indica-
tor”.
(•) Change.
(•) Adjust valve clearance.