Main Bearings-Remove And Replace; Removing Rear Main Bearing Cap; Rear Main Bearing Cap Side - Pontiac Grand Prix Service Manual

6-24
1 9 6 9 PONTIAC SERVICE MANUAL
Fig. 6-44 Removing Rear Main Bearing Cap
REAR MAIN BEARING OIL SEAL-REMOVE AND
REPLACE
The rear main bearing oil seal can be removed (both
halves) without removal of the crankshaft.
NOTE: Always replace upper and lower seal as a unit.
1. Remove oil pan. (See "Oil Pan-Remove and
Replace".)
2. Remove rear bearing cap using J 22325 (Fig. 6-44).
3. Remove oil seal from groove, prying from bottom,
using a small screwdriver.
NOTE: Always clean crankshafi surfae before install-
ing a new seal.
4. Remove rear bearing cap side oil seals. Place new
seals in position and place bearing cap in vise and
compress seals into place (Fig. 6-45).
5. Insert a new seal will lubricated with engine oil in
bearing cap groove; gradually push with a hammer
handle until seal is rolled into place.
6. To replace the upper half of seal, use a small
hammer and brass pin punch to tap one end of oil seal
(Fig. 6-46) until it protrudes far enough to be removed
with pliers. Push new seal into place.
NOTE: Avoid scraping seal on edge of cap and block
seal locating grooves.
7. Install bearing cap using J 22325 (Fig. 6-44) and
torque bearing cap bolts
100
lb. ft.
MAIN BEARINGS-REMOVE AND REPLACE
The main bearings are of precision insert type and do
not utilize shims for adjustment. If the clearances are
found to be excessive, a new standard or undersize
bearing insert, both upper and lower halves, will be
required.
NOTE: To replace the upper half of the rear main
bearing, it will be necessary to loosen all main bearing
caps. Slowly rotate the crankshafi and force bearing out
with aputty knife or similar tool.
REMOVE
1. Remove oil pan. (See
-
"Oil Pan-Remove and
Replace".)
2. Remove cap on main bearing requiring replacement
and remove bearing from shell.
NOTE: A cotter pin may be bent as required to remove
the bearing (Fig. 6-4 7).
3. Rotate the crankshaft clockwise as viewed from
front of engine. This will roll upper bearing shell out
of engine.
REPLACE
1.
Oil new upper bearing shell and ins& plain
( u ~ o t c h e d ) end of shell between crankshaft and
indented or notched side. Rotate the bearing into
place.
2. Install new bearing shell in bearing cap.
3. Check bearing clearance using Plastigage, or equivalent,
method as outlined below.
4. Install oil pan using new gaskets and seals.
BEARING CAP SIDE
OIL SEALS
8. Install oil pan. Do not overtighten.
Flg. 6-45
Rear Main Bearing Cap Side
Oil
Seals