Fiat Kobelco EX355 Tier2, Technical Manual

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EX355 W5-7-3
ENGINE INDUCTION
Troubleshooting
If the engine does not run well (insufficient output or irregular acceleration) -
1. Run the engine at idle.
2. Check for oil leakage from the turbocharger.
3. Listen for abnormal turbocharger noise.
4. Write down any abnormal conditions and their location.
5. Stop the engine.
6. Allow sufficient time for the turbocharger to cool.
7. Check the turbocharger air inlet hose and outlet hose. The bands attaching the hoses to the turbocharger must
be tight. There must be no air leakage.
WARNING
The turbocharger generates very high temperatures during operation. It will remain dangerously hot for some
time after the engine is stopped. Allow sufficient time for the turbocharger to cool before touching it.
OIL LEAK
Leak point Cause Countermeasure
Turbine housing gas inlet and
outlet tightening area
Bearing abrasion (Trouble in the Check the turbocharger air inlet
Turbine and bearing housing
oil supply system)
mating surfaces
Turbocharger oil inlet tightening Loose bolts Tighten bolts
area
O-ring damage Replace O-ring
Compressor housing case Oil leak from tightening area (Air Turbocharger OK
compressor oil leak)
ABNORMAL NOISE
Description Cause Countermeasure
Whistling sound High-speed turbocharger operation Normal sound of rotor rotation
Foreign particles in turbocharger
Grinding sound
Bearing abrasion (Trouble in the
Check the turbocharger air inlet
oil supply system)
Hissing sound Loose air or gas pipe
Tighten bolts, screws, and/or hose
bands as required
INSUFFICIENT OUTPUT OR IRREGULAR ACCELERATION
Problem Cause Countermeasure
Poor engine performance Loose air and/or gas pipes Tighten bolts, screws, and/or hose
because of air and/or gas leakage running to the turbocharger bands as required