Air Intake System - Operation and Tests/Turbocharger Malfunctions Diagnosing DIAGNOSING TURBOCHARGER MALFUNCTIONS Lack of engine power Noise or vibration Clogged manifold system Foreign material lodged in compressor, impeller or turbine Excessive dirt build-up in compressor Leak in engine intake or exhaust manifold Rotating assembly bearing failure (Do not confuse the whine heard during rundown with noise which indicates a bearing failure).
Bearings not lubricated (insufficient oil pressure) Air leak in engine intake or exhaust manifold Improper clearance between turbine wheel and turbine housing Broken blades (or other wheel failures) Engine emits black or grey smoke Excessive build-up in compressor or turbine Turbine housing cracked or attaching screws loose Exhaust manifold gaskets blowing Drag in turbine wheel Carbon build-up behind turbine wheel caused by coked oil or combustion deposits Dirt build-up behind compressor wheel caused by air intake leaks Bearing seizure or dirty or worn bearings caused by excessive temperatures, unbalanced wheel, dirty oil, oil starvation, or insufficient lubrication.
Oil on compressor wheel or in compressor housing (Oil being forced through center housing) Excessive crankcase pressure Air intake restriction Oil dripping from housing in intake or exhaust manifold Damaged or worn journal bearings Rotating assembly unbalanced Damage to turbine or compressor wheel or blade Dirt or carbon build-up on wheel or wheels Bearing wear Oil starvation or insufficient lubrication Shaft seals worn Excessive crankcase pressure CD,3274,G215,4 -19-15MAY92 215 3 CTM3274 (01JUL99) 215-3 Saran Liter Engines 060799 PN=338