TM 55-2840-251-23
Section VIII GENERAL MAINTENANCE PROCEDURES (Continued)
1-83 REASSEMBLY (Cont)
4. (Cont)
b.
Molykote G or Z (E.23) in either its paste form
(Type G) or powdered form (Type Z) mixed with engine
oil or grease may be used for turbine shaft splines and
threads during assembly of these and other components
which are subjected to operating temperatures in excess
of (800F) (327C) .
5. Locking Devices
a.
Lockwire, lockwashers, tablocks, tabwashers,
keywashers and cotterpins must never be reused. All
lockwire and cotterpins must fit snugly in the drilled
holes provided in bolts and studs for locking purposes.
Install a cotterpin so that the head fits into the
castellation of the nut and, unless otherwise specified,
bend one end of the cotterpin back over the stud or bolt
and the other end flat against the nut. Bushings and
plugs must be lockwired to the boss or case. Do not
lockwire the plug to the bushing.
b.
The
terms
keywasher,
tabwasher
and
cupwasher are interchangeable, as used in this manual.
These types of washers must only be used once. New
washers must always be used at each assembly. When
bending or setting the tabs on these washers, do not use
sharp-pointed tools. Use of such tools can lead to
subsequent failure of the locking tabs which, on
becoming detached, can pass through the engine,
causing extensive damage.
c.
Retaining
rings
must
be
installed
using
approved retaining ring pliers. Internal type rings must
not be compressed beyond the point where ends of the
ring would meet. External type rings must be expanded
only enough to allow installation without becoming bent.
After
installation,
insure
each
retaining
ring
is
completely seated in its groove, without looseness or
distortion.
d.
Effective locking of slotted steel locknuts on
bolts or studs requires full engagement of all locknut
threads. The chamfered part of the locknut ID does not
exert force on the bolt or stud.
e.
There are many combinations of lockwiring
techniques; however, certain basic rules apply to all.
The basic rules are as follows:
(1)
Lockwire must be tight after installation to
prevent failure due to rubbing or vibration.
(2)
Lockwire must be installed in a manner
that tends to tighten and maintain a part locked in
position, thus counteracting natural tendency of part to
loosen due to vibration.
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