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2-36
PISTONS-RODS
ENGINE
(58)
that tang on shell will engage notch in crank-
ca~e
when shell is rotated into place.
6. Rotate bearing shell into place as far as
possible by hand, then insert suitable tool in
crankshaft oil hole and rotate crankshaft
to
push shell into place. CAUTION: Bearing shell
should
move
into place with very little pres-
sure. If heavy pressure is required, shell was
not started squarely and will be distorted if
forced into place.
7. Place lower bearing shell (short oil groove)
in bearing cap, then check bearing clearance
with Plastigage as previously described.
8. The desired clearance with a new bearing
is .0008" to .0015". If this clearance cannot be
obtained with a standard size bearing, insert
an undersize bearing and check clearance
again with
Plastigage.
NOTE: Each undersize
bearing shell has a
number
stamped on outer
'sur face on or near the tang to indicate amount
of undersize.
9. When the proper size bearing has been
selected, clean out all Plastigage, oil the lower
shell and reinstall bearing cap. Tighten cap
bolts to 90-100 ft. lbs. torque. The crankshaft
should turn freely at flywheel rim; however, a
very slight drag is permissible if the .002"
undersize bearing is used.
10. After bearing is installed and tested,
loosen all bearing cap bolts
Y2
turn and con-
tinue with other
bearings.
When all bearings
have been installed and tested, tighten all bear-
ing cap bolts to 90-100
ft.
lbs. torque.
c. Installation of Rear Bearing Oil Seals
The rear crankshaft bearing is sealed against
external leakage of oil in the following manner.
(l)
An oil slinger machined on the crank-
shaft rotates in a groove formed in crankcase
and bearing cap just to rear of the rear crank-
shaft bearing. This oil
collecting
groove drains
back into the crankcase.
(2) Braided fabric seals are pressed int o
grooves formed in crankcase and bearing cap
to rear of the oil collecting groove. See figure
2-31.
(3) Cork seals are located at the vertical
joints between the bearing cap and the crank-
case.
The braided fabric seal can be installed in
crankcase only when crankshaft is removed;
however, the seal can be replaced in cap when-
ever cap is removed. Remove old seal and place
new seal in groove with both ends projecting
above parting surface of cap. Force seal into
groove by rubbing down with hammer handle
or smooth wood stick until seal proj ects above
the groove not more than
1!J.6".
Cut ends off
flush with surface of cap, using sharp knife or
razor blade. See figure 2-31. CAUTION: The
engine must be operated at slow speed when
first started after n
ew
braided seal is in
stalled .
CUT ALL ENDS OF SEALS
SQUARE AND FLUSH
\
(FA BRICl
Flgur. 2-31-Rear Bearing Oil Seal
s
The cork seals are slightly longer than
grooves in bearing cap. Coat grooves with gas-
ket cement and when
t
his
is
tacky carefully
work seals into grooves wit h a
putt y knife.
Lightly compress seals
into grooves by
placing
cap in a vise for a few
minutes.
Cut ends of
seals square and flush
with
machined surfaces of
bearing cap and coat outer surfaces with vase-
line before installing cap in crankcase.
d. Installation of Oil Pump and Lower
Crankcase
1. Install oil pump, following procedure
given
in paragraph 2-30 to avoid binding.
2. Thoroughly clean
lower crankcase
and fly-
wheel lower hous
ing. Inst all
both parts with
new
gaskets.
3. When connecting steering tie rod to pit-
man arm be careful to properly seat the bear-
ings around ball stud. Make sure that the
pressed steel dust cover properly covers open-
ing around ball stud. Turn tie rod plug up solid
then back off two turns and install cotter pin.
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