FleetPride National Parts Guide

12

TURBOS — DIAGNOSTIC MATRIX

TYPES OF FAILURE

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.

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

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Wastegate valve defective

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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

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Defective piston ring seal Bearing damage of turbo

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Increased blow by

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Charge or compression air cooler dirty

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Dirty air filter

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Fuel management system defective or improperly adjusted

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Worn engine components such as piston rings, valve guide, engine or cylinder liners worn

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Turbine housing leakage

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Turbo suction hose obstructed or pressure line leaking

Restricted flow in the exhaust system

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