Installing Camshaft Bearing - Pontiac Grand Prix Service Manual

6-58
1 -
PONTIAC SERVICE MANUAL
and carefully clean up hole. All scratches or nicks in
cast iron should be smoothed with an scraper or file.
Chamfer the rear edge of hole slightly to reduce
possibility of shaving down the outer diameter of
bearing when it is installed.
2. Insert remover adapter J 6173-4 into front bearing
to act as a support for the shaft.
NOTE: Iffiont bearing is being replaced insert remover
adapter in center bearing to act as support for the shaft.
3. Insert pilot J 6173-7 into hole in which bearing is to
be installed.
4. Coat outside of new bearing with oil and place it
over replacer adapter J 6173-3, indexing notch in edge
of bearing with pin on replacer adapter.
NOTE: The notch in edge of bearing is used to proper4
position the bearing, with respect to oil holes, when it is
installed. When bearings are installed in production,
notches all face fiont except the one in rear bearing. In
service it is necessary to install bearings with notch
facing the rear.
5. Position replace adapter J 6173-3, with bearing in
position against shoulder, against rear of hole in which
bearing is to be installed (Fig. 6-100). Index mark on
shoulder of replacer must point down (toward crank-
shaft side) to properly position bearing.
6. Insert shaft with indexing collar, thrust washer, and
nut through remover, pilot and replacer adapters.
Index lug on collar with ventilation hole in front of
block (Fig. 6-98).
7. Slip key J 6173-5 into notches in shaft behind
replacer adapter J 6173-3 and tighten nut to start
bearing into hole (Fig. 6-100). Continue to tighten nut
until bearing has been pulled completely into its hole.
When properly positioned, it will be approximately
flush with both sides of the transverse member.
NOTE: Rear bearing should be pulled in until fiont
edge is flurh with block. This will leave shoulder at end
of counter bore for camshaft rear plug visible behind
bearing.
8. Remove remover and replacer set J 6 173.
9. Visually observe that holes in bearing line up with
drillings in block.
10. Carefully remove rags used to catch particles of
metal and use magnet or vacuum cleaner to make sure
that all metal particles are removed from block
surfaces and oil drillings.
CAMSHAFT
-
REPLACE
1. Coat inner diameters of all camshaft bearings with
oil. Coat camshaft
lobes with
heavy
oil.
Canfully
Fig. 6-100 Installing Camshaft Bearing
install camshaft. Rotate camshaft through several
revolutions to make sure it is completely free. If any
tight spots are found, remove camshaft and very
carefully polish down the center journal slightly. If still
not free, polish the front and rear journals slightly. If
any particular bearing causes binding of the camshaft,
replace that bearing also.
NOTE: Front center and rear center journals should not
be polished except to remove slight roughness or
scratches. Slight warpage of the camshaft is not hannful,
provided the journals are polished down until the
camsfiafi rotates fieely in its bearings.
2. With camshaft properly seated, install camshaft
thrust plate and tighten bolts 20 lb. ft. torque.
3. Install timing chain sprockets and timing chain,
making sure marks on sprockets are aligned properly
(Fig. 6-97).
4. Install fuel pump eccentric and bushing. Tighten
camshaft sprocket retaining bolt 40 lb. ft. torque.
5. Install timing chain cover dowels and new gasket
and tighten cover to cylinder block bolts and cover to
block stud nuts 30 lb. ft. torque.
6. Insert four oil-pan-to-timing-chain-cover screws and
tighten 12 lb. ft. torque.
7. Install fuel pump and tighten bolts 25 lb. ft. torque.
8. Install harmonic balancer. Tighten bolt 160 lb. ft.
torque.
9. Coat base of lifters with heavy oil. Install hydraulic
lifters and push rods, making certain they are replaced
in their original positions.
10. Engage rocker arms on push rods and tighten
rocker
a r m
ball retaining nuts 20 lb. ft. torque.