Turbo fault finding guide

Engine runs hot Poor throttle response Smoke Engine lacks power Black exhaust smoke Blue exhaust smoke High oil use Turbo noisy Cyclic sound from turbo Oil leak from compressor seal Oil leak from turbine seal
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Cause Correction
Dirty Air Cleaner Clean or replace element according to manufacturer's recommendations
Restricted compressor intake duct Remove restriction or replace damaged parts as required
Restricted air duct from compressor to intake manifold Remove restriction or replace damaged parts as required
Restricted intake manifold Refer to engine manufacturer's manual and remove restriction
Air leak in feed from air cleaner to compressor Replace seals , gaskets or tighten fasteners as required
Air leak in feed from compressor to intake manifold Replace seals , gaskets or tighten fasteners as required
Air leak between intake manifold and engine Refer to engine manufacturer's manual and replace gaskets or tighten fasteners as required
Foreign objects in exhaust manifold (from engine) Refer to engine manufacturer's manual and remove obstructions
Restricted exhaust system Remove restriction or replace damaged parts as required
Exhaust manifold cracked, gaskets blown or missing Refer to engine manufacturer's manual and replace gaskets or tighten fasteners as required
Gas leak at turbine inlet/exhaust manifold joint Replace gasket of tighten fasteners as required
Gas leak in ducting after turbine outlet Refer to engine manufacturer's manual and repair leak
Restricted turbocharger oil drain line Remove restriction or replace damaged parts as required
Restricted engine crankcase breather Refer to engine manufacturer's manual, clear restriction
Turbocharger bearing housing sludged or coked Change engine oil and oil filter, overhaul or replace turbocharger as required
Fuel injection pump or fuel injectors incorrectly set Refer to engine manufacturer's manual and replace or adjust faulty components as required
Engine valve timing incorrect Refer to engine manufacturer's manual for correct settings and adjust as required
Worn engine piston rings or liners Refer to engine manufacturer's manual for correct settings and adjust as required
Burnt valves and/or pistons Refer to engine manufacturer's manual and repair as needed
Excessive dirt build up on compressor wheel and/or diffuser vanes Clean in accordance with details in the appropriate manuals
Turbocharger damaged Find and correct cause of failure, repair or replace turbocharger as necessary
Failed actuator diaphragm Replace using correct actuator service kit
Seized wastegate valve (in tubing housing) Free valve in accordance with details of manufacturer's manual
Leaking actuator hose Replace hose and clips
Wastegate mechanism set incorrectly Contact Spencer Diesel