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4 DLT ENGINE
TURBOCHARGER TROUBLE SHOOTING
Number
Problem
code
1
Engine lacks power
2
Black exhaust smoke
3
Excessive engine oil consumption
4
Blue exhaust smoke
5
Turbocharger noise
6
Cyclic sound from turbocharger
7
Oil leak from compressor seal
8
Oil leak from turbine seal
1 2 3 4 5 6 7 8 Cause
Remedy
x x
Clogged air filter element
Replace element
x x x x x x Obstructed air intake duct from Remove obstruction or replace damaged parts
compressor to intake manifold as required.
x x
x
Obstructed air outet duct from Remove obstruction or replace damaged parts
compressor to outlet manifold as required.
x x
x
Obstructed air intake manifold Remove obstruction
x
Air leak in duct from air cleaner Correct leaks by replacing seals or tightening
to compressor
fastners as required
x x x x x
Air leak from compressor to Correct leaks by replacing seals or tightening
intake manifold
fastners as required
x x x x x
Air leak at intake manifold to Replace gaskets or tighten fastners as required
engine joint
x x x x x x Obstruction in exhaust manifold Remove obstruction
x x
x Obstruction in exhaust system Remove obstruction or replace faulty
component as required
x x
x Gas leak in exhaust manifold to Replace gaskets or tighten fastners as required
engine joint
x x
x x Gas leak in turbine inlet to
Replace gaskets or tighten fastners as required
exhaust manifold joint
x
Gas leak in ducting after
Repair leak
turbine outlet
x x
x x Obstructed turbocharger oil
Replace gasket or tighten fastners as required
drain line
Repair leak
x x
x x Obstructed engine crankcase Remove obstruction or replace line as required
ventilation
Clear obstruction
x x
x x Turbocharger centre housing Change engine oil & oil filter, overhaul or
sludged or chocked
replace turbo as required
x x
Engine camshaft timing
Rectify
incorrect
x x x x
x x Worn engine piston rings or
Rectify
liners (blow by)
x x x x x x x x Dirt on compressor wheel
Clean using a non-caustic cleaner 8 soft brush.
Find 8 correct source of unfiltered air & change
oil & oil filter
x x x x x x x x Damaged turbocharger
Analyze failed turbocharger, find correct cause
of failure, overhaul or replace turbocharger as
required