Engine - Komatsu WB140-2N Operation & Maintenance Manual

ENGINE

Trouble
Oil pressure light remains on even with
the engine at high idle:
Cooling system overheating:
Temperature gauge stuck at "H"
Temperature does not show proper gauge
reading:
Engine cranks but will not start:
White or light blue exhaust gasses:
Exhaust gasses are black:
Popping noise heard at exhaust stack:
Abnormal engine noise:
WB140-2N, WB150-2N
Possible Cause
• Oil level too low.
• Oil filter plugged.
• Incorrect oil for the season.
• Coolant low due to leaks.
• Fan belt slipping.
• Cooling system blocked.
• Radiator fins damaged.
• Faulty thermostat.
• Radiator cap defective.
• Faulty temperature indicator.
• Faulty thermostat.
• Faulty gauge.
• No fuel.
• Air in fuel system.
• Low compression.
• Too much oil in oil pan.
• Unstable fuel.
• Air cleaner clogged.
• Faulty injectors or injection pump.
• Low compression.
• Faulty injectors.
• Improper fuel Cetane rating.
• Overheating.
• Damaged exhaust muffler.
• Excessive valve clearance.
OPERATION
Remedy
• Top off.
• Change oil and filter.
• Change oil.
• Top off and repair.
• Check belt tension.
• Flush cooling system.
• Repair or clean.
• Replace.
• Replace.
• Replace.
• Replace.
• Replace.
• Refuel.
• Bleed system.
• Adjust valve clearance.
• Correct the oil level.
• Change to suitable fuel.
• Clean or replace.
• Replace.
• Adjust valve clearance.
• Replace injectors.
• Change fuels.
• See "temperature indication".
• Replace.
• Adjust valves.
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