Pontiac tempest 1968 Service Manual page 279

6-62 1968 P O N T I A C SERVICE MANUAL
a. Insert tool against one end of the o i l seal
i n
the cylinder
M o c k
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. F o r m a new seal in the c a p (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. F o r m another new seal i n the cap (Fig. 6-106).
10. Assemble the cap to the block and tighten to
120 l b . f t . torque.
11. Remove the cap and Inspect the parting line to
I n s u r e t h a t n o s e a l m a t e r i a l h a s
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 l b . 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).
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5 9 ° '
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F i g . 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
F i g . 6-109 .002 Shim Positioned in C a p for Checking
Bearing Clearance