TROUBLESHOOTING
Black smoke possible cause:
Dirty air filter system
Suction and pressure line distorted or leaking
Excessive flow resistance in exhaust system/ leakage upstream of turbine
Fuel system/injection feed system defective or incorrectly adjusted
Valve guide, piston rings, engine or cylinder liners worn/increased blow by
Dirty compressor or charge air cooler
Boost pressure control swing valve/poppet valve does not close
Turbocharger bearing damage
Foreign body damage on compressor or turbine
Engine air collector cracked/missing or loose gaskets
Turbine housing/flap damaged
Insufficient oil supply of turbocharger
     
Blue smoke possible cause:
Dirty air filter system 
Excessive flow resistance in exhaust system/ leakage upstream of turbine 
Oil feed and drain lines clogged, leaking or distorted 
Crankcase ventilation clogged and distorted 
Coke and sludge in turbocharger center housing 
Valve guide, piston rings, engine or cylinder liners worn/increased blow by 
Dirty compressor or charge air cooler 
Piston ring sealing defective 
Turbocharger bearing damage 
      
Boost pressure too high possible cause:
Fuel system/injection feed system defective or incorrectly adjusted
Boost pressure control swing valve/poppet valve does not open
Pipe assy. to swing valve/poppet valve defective
      
Compressor/turbine wheel defective possible cause:
Turbocharger bearing damage
Foreign body damage on compressor or turbine
Turbine housing/flap damaged
Insufficient oil supply of turbocharger
     
High oil consumption possible cause:
Dirty air filter system
Excessive flow resistance in exhaust system/ leakage upstream of turbine
Oil feed and drain lines clogged, leaking or distorted
Crankcase ventilation clogged and distorted
Coke and sludge in turbocharger center housing
Valve guide, piston rings, engine or cylinder liners worn/increased blow by
Dirty compressor or charge air cooler
Piston ring sealing defective
Turbocharger bearing damage
     
Insufficient power/boost pressure too low possible cause:
Dirty air filter system
Suction and pressure line distorted or leaking
Excessive flow resistance in exhaust system/ leakage upstream of turbine
Fuel system/injection feed system defective or incorrectly adjusted
Valve guide, piston rings, engine or cylinder liners worn/increased blow by
Dirty compressor or charge air cooler
Boost pressure control swing valve/poppet valve does not close
Pipe assy. to swing valve/poppet valve defective
Turbocharger bearing damage
Foreign body damage on compressor or turbine
Engine air collector cracked/missing or loose gaskets
Turbine housing/flap damaged
Insufficient oil supply of turbocharger
     
Oil leakage at compressor possible cause:
Dirty air filter system
Excessive flow resistance in exhaust system/ leakage upstream of turbine
Oil feed and drain lines clogged, leaking or distorted
Crankcase ventilation clogged and distorted
Coke and sludge in turbocharger center housing
Valve guide, piston rings, engine or cylinder liners worn/increased blow by
Dirty compressor or charge air cooler
Piston ring sealing defective
Turbocharger bearing damage
     
Oil leakage at turbine possible cause:
Oil feed and drain lines clogged, leaking or distorted
Crankcase ventilation clogged and distorted
Coke and sludge in turbocharger center housing
Valve guide, piston rings, engine or cylinder liners worn/increased blow by
Piston ring sealing defective
Turbocharger bearing damage
     
Turbocharger generates acoustic noise possible cause:
Suction and pressure line distorted or leaking
Excessive flow resistance in exhaust system/ leakage upstream of turbine
Dirty compressor or charge air cooler
Turbocharger bearing damage
Foreign body damage on compressor or turbine
Exhaust gas leakage between turbine outlet and exhaust pipe
Engine air collector cracked/missing or loose gaskets
Turbine housing/flap damaged
Insufficient oil supply of turbocharger