TM 5-3805-280-24-2
Air Intake and Exhaust System
30
INTERNAL CENTER HOUSING
12
1. Using a flashlight, look through the oil return hole (A),
to check the condition of the shaft and/or bearings.
There should not be excess carbon deposits on the
shaft or in the housing.
A--Oil Return
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2. Excessive "blueing" or "coking" of oil along the
complete length of the shaft indicates a possible lack
of lubrication caused by an engine failure, or improper
operation, such as hot shutdowns.
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TURBOCHARGER BENCH TEST
1. Mount the turbocharger in a vise.
2. Rotate the shaft, using both hands, to check rotation
and clearance. The shaft should turn freely, however,
there may be a slight amount of drag.
Continued on next page
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