T O 35C2-3-442-2
P-8-627-34
T M 5-6115-457-34
TM-07464A-35
NOTE
1. Inspect thrust washers (5, fig-
ure 8-63) for excessive wear, distortion,
If results of inspection in paragraph
and discoloration. Minimum allowable
8-224 indicated excessively worn
thickness of washer is 0.175 inch. If
bearings, replace bearings at this
limit is not met, replace thrust washer.
time. Ensure that bearing tab is
aligned with the recess in cylinder
8-225. REPAIR.
block. The upper bearing half has
a. Remove minor nicks and burrs from
an oil groove machined on the inside
bearing caps using a smooth file.
of bearing with two oil holes. This
b. Dress thrust washer contact area at
bearing half can be installed only as
rear of crankshaft on either side of rear
an upper main bearing. It is recom-
main crankshaft bearing journal with a
mended that all bearings (4, figure
hone to remove slight imperfections.
8-63) halves be replaced even if
c . Polish machined surface, at rear of
only one bearing must be replaced.
crankshaft that comes into contact with
When new bearings are installed,
rear oil seal, to remove slight ridges less
proper clearance must be checked
than 0.0002 inch in variation, using a
as outlined in para. e, steps 1, 2,
crocus cloth wet with fuel oil. Rotate
and 3, above.
crankshaft and polish the complete circum-
c. Lubricate inside surface of bearings
ference of the surface.
with clean engine oil.
8 - 2 2 6 . REASSEMBLY.
d. Install upper main bearing halves (4)
Refer to figure 8-63 and reassem-
in cylinder block.
ble crankshaft group and main bearings in
e.
Lift crankshaft using a suitable web
the reverse order of index numbers
sling,
and install crankshaft with crank-
assigned. Pay particular attention to the
shaft
gear timing mark aligned with timing
following:
mark
on camshaft gear if camshaft has not
If crankshaft gear (8) and sleeves
been
removed. Refer to figure 8-30.
(7 and 10) had been removed, install as
f. install thrust washers (5, figure 8-63)
follows:
on each side of rear main bearing in cylin-
1. Heat sleeves (7 and 10) and gear
der block with the words "BLOCK SIDE",
(8) to 600F maximum and install on crank-
that are stamped on each thrust plate, next
shaft.
to the cylinder block half of the upper main
NOTE
bearing.
Position gear with timing mark
toward front, Ensure key (9) is
g. Install lower bearing halves (4) and
positioned properly in keyway of
bearing caps (3) with lower bearing half tab
crankshaft (11).
mating with tab on upper bearing half.
The bearing caps are numbered to ensure
2. Install key (9) in keyway of
installation on the same journal from
crankshaft (11).
which they were removed. Torque bolts
3. Heat gear to 600F maximum
as foil ows :
and install on crankshaft with timing mark
toward the front.
1. Lubricate thread of bolts (1) with
b. Clean main bearing surfaces in
crankcase oil, and tighten from 27 to
c y l i n d e r block.
33 foot-pounds torque.
8-138
Change 8
