Isuzu AA-6HK1T, Workshop Manual

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0A–34 GENERAL INFORMATION
Condition Possible Cause Correction
Engine has less than normal
power
Blue or black smoke
Excessive oil consumption
Excessive turbocharger noise
Excessive rotating part wear
Restricted air cleaner
Restricted intake pipe and hose
Loose connection of the turbocharger inlet and
outlet
Restricted exhaust and silencers
Restricted air breather
Compressor wheel damage
Turbine wheel damage
Carbon build-up on the turbine wheel
Dragging or seized rotating assembly
Restricted air cleaner
Leakage from turbocharger oil seal
Restricted turbocharger oil drain pipe
Restricted air breather
Compressor wheel damage
Turbine wheel damage
Restricted center housing oil drain passage
Restricted air breather
Leakage from turbocharger oil seal
Compressor wheel damage
Turbine wheel damage
Excessive oil pressure
Restricted center housing oil drain passage
Restricted intake and exhaust system joints
Damaged intake and exhaust system gaskets
Rough rotation of turbocharger parts
Compressor wheel rubbing against housing
Damaged compressor wheel
Turbine wheel rubbing against housing
Damaged turbine wheel
Carbon build-up on the turbine wheel
Low engine oil level
Contaminated oil
Restricted turbocharger oil feed pipe
Carbon build-up on the turbine housing
Dirty compressor housing
Worn turbine shaft bearings
Contaminated engine oil
Wrong grade or type of engine oil
Restricted turbocharger oil feed pipe
Defective turbocharger oil seal
Restricted center housing oil drain passage
Turbine shaft sludge and/or coking
Inadequate oil supply
Clean or replace
Clean or replace
Repair
Repair
Clean or replace
Replace
Replace
Replace
Replace
Clean or replace
Replace
Repair or replace
Clean
Replace
Replace
Clean or replace
Clean
Replace
Replace
Replace
Repair
Clean or replace
Repair
Repair
Replace
Replace
Replace
Replace
Replace
Clean or replace
Correct
Replace oil
Repair or replace
Clean
Clean
Replace
Change
Change
Clean or replace
Replace
Clean or replace
Replace
Correct
13. Turbocharger