TM 55-2840-251-23
Section VIII GENERAL MAINTENANCE PROCEDURES (Continued)
1-78 INSPECTION (Cont)
4. Oil Filter Metal Type Element (Cont)
NOTE
Examples of possible contaminants
are:
- Small flakes of non-ferrous metal
normally
originating
from
plain
bearings or bushings of babbit, tin,
bronze or silver.
- Small flakes of ferrous metal normally
originating from spalled anti-friction
bearings, gear teeth or fretting.
- Slivers of steel normally originating
from interference between steel parts
or from heavy scoring.
- Fuzz or powdered material is cast iron
and originates from the propeller shaft
oil transfer sleeve.
It can be assumed that less than 40 small particles of
miscellaneous
metal,
largely
nonferrous,
can
be
discounted. In such cases the filter element should be
cleaned and reinstalled. It must also be considered that
new engines, or engines immediately after extensive
shop work, may produce metal contamination at the oil
filter. In such cases normal precautions apply. (Refer
to TB 43-0106).
CAUTION
In all instances of engine generated
metal contamination, there exists the
possibility
of
residual
matter
remaining in propeller and airframe oil
systems.
Residual
matter
could
contribute to recontamination of newly
installed engine. When an engine is to
be
replaced,
due
to
metal
contamination of the oil system, all
airframe components associated with
the
engine
oil
system,
propeller,
propeller governors, tubes and hoses
should be flushed according to TM55-
1510-209-23
and
TM55-1510-215-23.
Airframe oil coolers shall be replaced
in accordance with applicable airframe
manual. Engine oil-to fuel heaters and
governors shall be returned to Depot.
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