SERVICE MANUAL
TURBOCHARGERS
Section 1
GENERAL
Turbocharger Diagnostic Data:
Prior to servicing the Turbocharger diagnose the
problem.
Replace the Turbocharger if:
-
The Compressor wheel or Turbine wheel has
rubbed on its housing causing heavy damage.
Replace the Core Assembly If:
-
The Compressor wheel or Turbine wheel has
rubbed on Its housing causing damage to the
housings or wheels themselves.
NOTE: High spots must be removed from the
housings before reuse with a new core assembly.
If engine and Turbocharger are opperable perform
engine diagnostic tests as detailed In appropriate
DIAGNOSTIC MANUAL.
NOTE: Engine performance problems are usually
related to secondary problems in other engine
systems:
Engine
Performance
Problem:
Turbocharger shaft seals leak oil Into the
Intake or exhaust manifolds, resulting in
black
smoke
and
excessive
engine
temperatures.
Secondary
Problems:
a.
Excessive Intake restriction caused by:
- Dirty Air filters
- Collapsed Intake pipes or hoses
b.
Restricted
Turbocharger
oil
drain
system caused by:
- Plugged hoses
- Collapsed hoses
c.
Excessive crankcase pressure caused
by:
- Dirty crankcase breather.
- Overfilling crankcase with engine oil.
- Excessive engine blow by.
Specific
diagnostic
data
may
be
located
in
the
Turbocharger Manual.
CGES-185-3
PRINTED IN UNITED STATES OF AMERICA
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