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Diesel Ad Rollngo Caddy
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