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 quantities, are abrasive. Parts must be cleaned as
specified and kept clean. Wrap or cover parts
and components when assembly procedures are
mot immediately completed.
(2) Coat all bearings, shafts, and all contact
surfaces w i t h e n g i n e
oil
(OE)
to
insure
lubrication of parts during initial engine starting.
(3) Always use new gaskets and preformed
packings when assembling engine.
(4) Use flat washers under all lockwashers,
nuts and bolts to protect aluminum surfaces.
(5) Most bolts, cap screws, and nuts must
be secured with lockwashers, tab washers,
locking wire, or cotter pins, depending on
method of locking specified.
(6) Whenever a locking method is not
specified for bolts and cap screws, the mid-grip
helical-coil threaded inserts into which the bolts
or screws are threaded serve as the locking
device.
(7) It is also important that all hardware be
tightened to the specified torque. Refer to torque
Note. The special coil screw lock inserter tools
specifications,
listed in special tool table 2-1 must be used when
Torque
Specifications
installing the self-locking thread type inserts.
a. Standard Torques for Studs and Bolts.
These special inserters are further identified by
Apply a light film of anti-seize thread compound
painted areas marked either with a red handle or
FSN 9150-663-1770 to stud, bolt, cap screw
a red stripe around the body.
threads, and contact face of nuts, bolt heads, and
1. Thread new insert (A) into the threaded guide of
cap screws. Avoid excessive amounts of com-
inserter -5120-797-2407 by slowly turning the pilot
pound in blind tapped holes.
until insert is flush with the end of the tool.
2. Insert the pilot of the screw thread inserter (B) - 5120-
Torque
Size
797-2407 into the threaded hole in cylinder, with face
(lb-in.)
(dia. in.)
of the inserter resting solidly against the casting as
shown.
1/4 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 75-100
3. Slowly turn handle (C) of pilot clockwise until no
5/16 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ...150-175
further resistance is felt. The insert will then be flush
3/8 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ...275-325
with cylinder casting. Remove inserter.
7/16 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ...400-450
1/2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ...550-600
9/16 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ...800-850
insert in cylinder assembly using screw
b. Special Torques for Studs and Bolts. A p p l y
thread
inserter-5120-797-2407.
a light film of anti-seize thread compound FSN
9150-663-1770 to stud, bolt, cap screw threads,
6 - 6 . Assembly
and contact face of nuts, bolt heads, and cap
a. General. Extreme care must be exercised in
screws
(except
as
noted).
Avoid
excessive
all assembly operations to insure satisfactory
amounts of compound in blind tapped holes.
engine performance. General rules for assembly
C r a n k c a s e Tie-rod Bolts . . . . . . . . . . ...640
are
outlined
below.
Step-by-step
procedures
for
Main Bearing Stud . . . . . . . . . . . . ...450
assembling the various components are covered
Crankcase Main Bearing Stud Nuts
in the paragraph relating to the specific com-
(Procedure):
ponent.
(1) Tighten all nuts to . . . . . . . ..500
b. Precautionary Rules.
(2)
Tighten
all
nuts
to
.
.
.
.
700-825
(1) Cleanliness is essential in all assembly
(3) Check stud stretch, it must be 0.019-
operations. Dirt and dust, even in minute
0.022 in.
6-9
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