Pontiac FIREBIRD 1972 Service Manual page 590

6-78 1972 PONTIAC SERVICE MANUAL
ing collar in ventilator hole in front of block. This
indexes shaft so that it cannot rotate.
e. Slip key J 6173-5 into notches in shaft behind
bearing to be removed (Fig. 6- 132).
f. Turn nut on front of shaft to pull key against
remover adapter J 6173-4, then continue to turn
nut until bearing is pulled out of its hole.
2. 307 Engine:
Use tool 5-21473-1 to drive out front bearing to-
ward rear.
Install extension 5-21054 on intaller 5-21473-1
and drive center three bearings out toward rear
(Fig. 6-133).
To remove rear bearing it will be necessary to
remove transmission and flywheel.
Drive out expansion plug from rear of block by
driving rearward.
Use tool 5-21473-1 to drive out rear bearing to-
ward front.
REPLACE
Place a clean rag against each side of transverse mem-
ber just below bearing hole to catch any shavings and
carefully clean up hole. All scratches or nicks in cast
iron should be smoothed with a scraper or file.
Chamfer the edge of hole slightly in which bearing is
being installed to reduce possibility of scoring the
outer diameter of bearing when it is installed.
All except 307 Engine:
a. Insert remover adapter J 6173-4 into front bear-
ing to act as a support for the shaft.
Fig. 6 - 1 3 3 Procedure for Removing and lnstall~ng Camshaft
Bearings, L-6 and V-8
NOTE: If frnt bearing is being replaced, insert
remover adapter in center bearing to act as sup-
port for the shaft.
b. Insert pilot J 6173-7 into hole in which bearing is
to be installed.
c. 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.
CAUTION: The notch in edge of bearing is used
to properly position the bearing with respect to
oil holes, when it is installed. When bearings
are installed in production, notches all face
front except the one in rear bearing. In service
it is necessary to install bearings with notch
facing the rear.
Position replacer adapter J 6173-3, with bearing
in position against shoulder, against rear of hole
in which bearing is to be installed (Fig. 6- 134).
Index mark on shoulder of replacer must point
down (toward crankshaft side) to properly posi-
tion bearing.
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- 13 1).
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- 134). Continue to tighten
nut until bearing has been pulled completely into
its hole. When properly positioned, it will be ap-
proximately flush with both sides of the trans-
verse member.
Rear bearing should be pulled in until front edge
is flush with block. This will leave shoulder at end
Fig. 6-1 3 4 Installing Camshaft Bearing