6-62
1968
PONTIAC
SERVICE
MANUAL
a.
Insert
tool
against one end of the oil
seal
in
the cylinder
Mock
and drive the
seal
gently
into
the groove
until
the
tool
bottoms.
b. Remove the
tool
and
repeat
at the other end
of
the
seal
in the cylinder block.
5. Clean the block and bearing cap parting
line
thoroughly.
6. Form a new
seal
in the
cap
(Fig. 6-106).
7. Remove the newly formed
seal
from
the cap and
cut
four (4) pieces approximately
3/8"
long
from
this
seal.
8.
Work
two 3/8" pieces
into
each
of the
gaps
which
have been
made
at the end of the
seal
in the
cylinder
block. Without cutting off the ends,
work
these
seal
pieces In
until
flush
with
the parting
line
and
until
no fibers are protruding over the metal
adjacent
to the groove.
9. Form another new
seal
in the cap (Fig. 6-106).
10.
Assemble the cap to the block and tighten to
120 lb. ft. torque.
11. Remove the cap and Inspect the parting
line
to
Insure
that
no
seal
material
has been compressed
between the block and the cap. Clean as necessary.
12.
Apply
a 1/16" bead of sealer
from
the center
of
seal
across
to the external cork groove.
13. Reassemble the cap. Tighten to 120 lb. ft.
torque.
14.
Install
baffle and oil pump.
15.
Install
oil pan (see Oil Pan - Remove and
Replace).
MAIN
BEARINGS-REMOVE
AND
REPLACE
1. Remove oil pan (see Oil Pan - Remove and
Replace).
\
/\
/
N
59°
'
/
/
Fig.
6-108
Tool
For
Removing
Upper
Half
of Main
Bearing
2. To gain access to bearing caps, remove oil
baffle. To gain access to
rear
main, remove oil
pump in addition to oil baffle.
3.
Remove bearing cap of main bearing to be
replaced.
4. Make a tool for removing upper half of bear-
ing shell as shown in Fig.
6-108.
5. Insert tool in oil hole of crankshaft and rotate
crankshaft
in usual direction of rotation.
This
will
cause bearing to be moved from between shaft and
bearing
seat.
6. Oil bearing surface of shell and install by in-
serting plain end of bearing shell at indented side of
bearing
seat and gently rotating shell into place by
turning
shaft.
7.
Install
new bearing lower half by inserting in
bearing
cap so indentation in shell and cap coincide.
8.
Install
bearing cap and check fit of bearing,
using Plastigage as outlined below.
CA
UTION:
Under no circumstances should
bear-
ing caps be filed or shimmed in an effort to
effect
a fit.
PLASTIGAGE
METHOD
FOR
DETERMINING
MAIN
BEARING
CLEARANCE
When
checking main bearing clearance with engine
in
the car, place a .002" brass shim between the
crankshaft
journal
and the lower bearing in each
bearing
cap next to the one being checked (Fig.
6-109).
Tighten
all cap bolts to proper torque as follows:
rear
- 120 lb. ft., all others 100 lb. ft.
This
causes
the crankshaft to be forced against the upper bearing
and
insures an accurate measurement of the total
clearance.
1. Remove the bearing cap of the bearing to be
checked. Wipe the bearing and the
journal
free of
oil.
2. Place a piece of type PG-1 Plastigage the length
of the bearing (parallel to the crankshaft) on the
SH'M
Fig.
6-109 .002
Shim
Positioned
in Cap for
Checking
Bearing
Clearance
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