Troubleshooting Your System
TURBOS ARE OFTEN A SYMPTOM OF ANOTHER PROBLEM. IF YOU DON’T ADDRESS THE CAUSE OF TURBO FAILURE, YOU MAY HAVE TO REPLACE THE TURBO AGAIN . COMMON FAILURES AND POSSIBLE CAUSES Prior to installing a new turbo, it’s vital to evaluate and identify the root cause of the failure, by a common set of indicators. Use the Turbocharger Troubleshooting Matrix below to determine if the issue is actually the turbocharger.
TIPS FROM THE PROS ✔ TROUBLESHOOT and correct any causes of original failure (see matrix) ✔ CHECK SYSTEM — keep free of leaks and debris when changing turbocharger ✔ LUBRICATION ú Keep proper weight and quality ú Keep the right oil level and oil pressure ú Keep oil filter and oil lines clean ú Check for kinks or sink drains in oil lines
PROBLEM INDICATOR
POSSIBLE CAUSE Leaking or damaged oil feed and drain line
Restricted crankcase breathers
Sludge or coke in the center housing Wastegate swing valve does not close Wastegate swing valve does not open
Wastegate valve defective
Foreign object damage to turbine or compressor
Exhaust gas leakage present between exhaust pipe and turbine outlet
Engine air box cracked or missing Turbine housing damaged Improper oil supply to turbo
Clogged catalytic
Defective piston ring seal Bearing damage of turbo
Increased blow by
Charge or compression air cooler dirty
Dirty air filter
Fuel management system defective or improperly adjusted
Worn engine components such as piston rings, valve guide, engine or cylinder liners worn
Turbine housing leakage
Turbo suction hose obstructed or pressure line leaking
5
Restricted flow in the exhaust system
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