TM 5-3805-281-24-2
Air Intake and Exhaust System
IMPORTANT: Use only moderate hand force
(3-4 pounds) on each end of shaft.
3. Next, pull up on the compressor end of the shaft and
press down on the turbine end while rotating shaft.
Neither the compressor wheel nor the turbine wheel
should contact the housing at any point.
NOTE: There will be some "play" because the bearings
inside the center housing are free floating.
Checking for Contact of Compressor and Turbine Wheels
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4. Next, check shaft endplay by moving the shaft back
and forth while rotating. There will be some endplay
but not to the extent that the wheels contact the
housings.
IMPORTANT: Before you finalize your conclusion that
the turbocharger has not failed, it is
strongly recommended that the
following procedures of checking radial
bearing clearance and axial bearing
endplay with a dial indicator be
performed. These procedures are not
Checking Shaft End Play
required if a failure mode has already
been identified.
NOTE: These diagnostic procedures will allow you to
determine the condition of the turbocharger. If the
turbocharger has failed, analysis of your
inspection notes should direct you to the specific
areas of the engine to correct the problems
causing the turbocharger failure (See
TURBOCHARGER FAILURE ANALYSIS, outlined
earlier in this group). It is not unusual to find that
a turbocharger has not failed. If your turbocharger
passes all the inspections, the problem lies
somewhere else.
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