Air Intake and Exhaust System
02
080
2
RG,RG34710,1256
–19–23AUG02–2/2
Ingestion of Foreign Objects
A third cause of turbocharger damage is the ingestion
of foreign objects. Foreign objects or particles can be
ingested and cause damage to the turbocharger on
both compressor and turbine sides. This is easy to
avoid.
On the compressor side, foreign objects usually take
the form of dust, sand, or shreds of air cleaner
element that enter through improperly installed air
cleaner elements. Leaky air inlet piping (loose clamps
or torn rubber joints) or torn pleats in dry-type air
cleaner elements also create problems.
The result is erosion of compressor blades that can
cause the delicately balanced wheel to wobble.
IMPORTANT: Whenever an internal engine failure
(valve, valve seat, piston) occurs, a
thorough inspection of the
turbocharger MUST BE performed
before returning engine to service.
Restricted Oil Drainage
A fourth cause of turbocharger damage is restricted
lube oil drainage. The lubricating oil carries away heat
generated by friction of the bearings and from the hot
exhaust gases. If drainage back to the sump is
impeded, the bearings will overheat with damage that
will ultimately lead to 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 blow-by.
Periodically check both the turbocharger oil drain tube
and engine breather tube for damage or restriction.
Correction of these conditions leads to longer
turbocharger life.
Abnormally High Exhaust Temperatures
A fifth cause of turbocharger damage is 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 over-temperature. 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
overfueled 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 overtemperature operation has been
identified, an inspection of the air inlet and exhaust
systems should be performed. Also, check the fuel
delivery and timing.
CTM100 (06APR04)
02-080-2
P
OWER
T
ECH
10.5 L & 12.5 L Diesel Engines
040604
PN=302
Summary of Contents for 6105ADW
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