Hitachi EX1900-5 Operator's Manual page 266

Problem
Exhaust Gas is White
Turbocharger Excessively
Noisy or Vibrates
Oil Dripping from
Turbocharger Adapter
Excessive Drag in Turbo-
charger Rotating Members
TROUBLESHOOTING
ENGINE
Cause
Wrong fuel
Cold engine
Thermostat faulty or too "cool"
Coolant leakage into engine cylinder
Bearings not lubricated
Worn bearings
Air leak in engine, intake or exhaust
manifold
Improper clearance between turbine
wheel and turbine housing
Broken blades on turbine
Damaged or worn bearings and/or
worn seals
Excessive crankcase pressure
Turbocharger oil return line carbon
build up where line passes exhaust
manifold
Carbon build-up behind turbine wheel
caused by combustion deposits
Dirt build-up behind compressor wheel
caused by air intake leaks
Bearing seizure or dirty or worn
bearings, caused by excessive
temperature, unbalanced wheel, dirty
oil, oil starvation, or insufficient
lubrication
11-6
Solution
Drain tank. Use correct fuel.
Run engine until warm.
See your authorized dealer.
See your authorized dealer.
Insufficient oil pressure.
Check for restricted turbocharger oil
line.
See your authorized dealer.
Inspect, repair.
See your authorized dealer.
Remove exhaust elbow and air inlet
hose and inspect.
See your authorized dealer.
Inspect and clean air cleaner.
Check for proper engine service
intervals or dirt enter into engine.
Check vent tube to ensure tube is not
plugged.
Clean.
Remove line.
Inspect, clean.
Inspect, clean.
Inspect, clean.
See your authorized dealer.