TM55-2840-251-23
SECTION VIII GENERAL MAINTENANCE PROCEDURES (Continued)
1-71
SERVICING (Cont)
3.
Should
an
engine
oil
system
become
contaminated it must be drained and refilled with oil:
a.
Drain oil tank (subparagraph 2).
b.
Cut lockwire and remove hexagon plug (8)
or chip detector (9) and preformed packing (10) from 6
o'clock position in propeller reduction gearbox.
c.
Cut lockwire and remove hexagon plug (11)
and preformed packing (12) adjoining external scavenge
pump mounting on accessory gearbox.
d.
Drain oil from aircraft oil coolers (TM55-
1510-209-23).
e.
With drain plugs and drain plug removed,
perform dry motoring run (Chapter 1, Section X). This
permits the scavenge pumps to clear the engine.
CAUTION
To prevent excessive operation with
limited lubrication, limit rotation to
shortest possible time needed to
accomplish complete drainage.
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