This question is asked most often when the turbo
It is mostly oil related but sometimes
it's demaged from old age,fatigue
from the blade
of the rotor falling off or could be thrust failure
from low oil
pressure, wrong blowoff valve
adjustment or size or air intake restrictions.
turbo's are demaged beyond identifying
any evidence of why it failed.
Turbochargers are very reliable and can outlast the
life of the engine.Only poorly set up or unserviced
oil can hurt a turbo.
Here is a list of faults and causes.
If you suspect it's the turbo causing the smoke,
could the engine
be at fault? Check the engine
condition,oil drain blockage,or air cleaner
these are 'ok', pull off the air intake
of theturbo and feel for radial or axial play.
All journal bearing turbo's have some radial play
(About '12 thou or.25 mm).
is'ok',check oil condition,maybe there is
carbon build up somewhere.If all external
are 'ok' get the turbo serviced.
Usually only noisy from demage or missing
blades,sometimes it could
be something hitting
the blades or maybe worn journal bearings
(check oil pressure/condition).
An out of balance rotor could be the cause but
usually it would need to be
badly out of balance
to start warping at speed.
This could be many things but with the turbo it
could be demaged
compressor wheel or turbine
wheel blades,tight spinning rotor or cracked,
broken or seized
wastgate.If any of these are
faults the turbo needs to be removed.
Other things which cause
it is pipeing leaks,
blokages,exhaust blockages,ignition fault or
blocked air intake.Also worn
slow the rotor causing
Caused possibly from low oil pressure or blowoff
Undersize compressor wheel can
cause it to if flow of engine or boost is increased.
Get turbo serviced
and include heavy duty thrust
bearing if the engine flow is increased.
Also a restricted air
intake can cause it.
Sometimes this can be seen through the turbine
the blades with a torch and
is caused by foreign material in the manifold
or possibly over heated blades
beyond the materials limit.Old age can possibly
broken tips also.Over spinning can cause
a blade to be thrown off,but this is ussually
accompanied with overheating
BROKEN COMPRESSOR WHEEL BLADES
Similar to turbine wheel breakage causes
,but without the heat.Mostly caused
by blow off valve setting or
type.It mainly brakes one blade off and that
the others behind it while it's trying to
get sucked through the compressor wheel.A foreign
can obviously brack off a blade when it hits a
100000rpm compressor wheel.
It also can caused
by blow off valve setting or type but this is rare.
If this is more than normal (about .5 mm) then it is
either low oil
pressure or out of balance both would
wear journal bearings.Check reasons for low oil
pressure or blockage oil feed to turbo also check for
out of balance signs
This problem needs urgent repair!
EXHAUST GAS LEAK
Easily fixed but only with the turbo removed ,by
mounting flange face if it needs it and
installing a new gasket if that is where the
On bad cases of this it can cause low boost.
Mostly from back fire or blow off valve.Spinning
compressor wheel off
can only happen on shafts
with right hand threads holding the compresser
wheel on but can
move wheel andshift out of
balance on left hand nut shafts
Click on the problem to go
NOT THIS KIND OF SMOKE
BROKEN TURBO PARTS