Consumer choices lubricants survey – GFK P.18
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AIR OUT
Cut-away section of a turbocharger
Bearing
Turbine Wheel
AIR IN
EXHAUST OUT
Compressor Wheel
EXHAUST IN
bearings will overheat and get damaged which
will lead ultimately to its failure. There are two
primary reasons for restricted drainage. A
blocked drain tube, due to either damage or a
buildup of sludged oil or high crankcase pressure which can be due to restricted crankcase
breather or excessive engine blowby.
The turbocharger should be periodically
checked to ensure that the oil drain tube and
engine breather tube are free from damage
or restriction. Correction of these conditions
leads to longer turbocharger life.
Abnormally High Exhaust
Temperatures
Elevated exhaust temperatures cause coking
of oil which can lead to bearing failure. Extreme
over-temperature operation can cause wheel
burst. There are two basic causes of abnormal
temperatures. The first is restricted air flow
and the second is overpowering the engine.
In either case the engine has more fuel than
available air for proper combustion, this over
fueled condition leads to elevated exhaust
temperatures.
Causes of restricted air flow can include
damaged inlet piping, clogged air filters,
excessive exhaust restriction, or operation at
extreme altitudes. Overpowering generally
is due to improper fuel delivery or injection
timing. If over temperature operation has been
identified, an inspection of the air inlet and
July-September 2012 | Lubezine Magazine
exhaust systems should be performed. The fuel
delivery and timing should also be checked.
Oil Contaminat