Pontiac firebird 1968 - Timing Belt Adjustment; Timing Belt Top Front Cover- Remove and Replace

SIX CYLINDER ENGINE
6-9
HOUSING MOUNTING
BOLTS
Fig. 6-11 Accessory Drive Housing Mounting Bolts
3. Disconnect fuel and vacuum lines from
carburetor.
4
0
Depending upon accessories remove necessary
drive belts and mounting brackets,,
5. Remove carburetor for intake manifold replace-
ment
6. Disconnect exhaust pipe at manifold flange.
7. Remove manifold to cylinder head attaching
bolts and clamps and remove manifolds as an as-
sembly.
REPLACE
1
0
Clean gasket flanges on cylinder head and
manifolds.
2. Check for cracks on manifold castings.
3. If necessary to replace either intake or exhaust
manifold, separte them by removing one attaching
bolt and two nuts at center of assembly. Reassemble
manifolds using new gasket. Tighten finger tight and
torque nuts to 25 lb. ft. and bolt to 22 lb* ft. after
assembly to cylinder head.
4. Position new gasket over manifold studs on cyl-
inder head and carefully install the manifold in posi-
tion, making sure the gasket is in place.
5. Coat face of manifolds liberally with a solution
of graphite in alcohol.
6. Install bolts and clamps while holding manifold
in place with one hand.
7. Tighten bolts to 30 lb. ft.
8. Connect exhaust pipe to manifold.
9. Reverse steps 1-5 of Removal to complete in-
stallation procedure.
TIMING BELT TOP FRONT COVER-
REMOVE AND REPLACE
REMOVE
1. Remove three retaining screws on front of
cover.
2. Lift up cover to disengage side clips.
3. Remove retaining clips from cover.
REPLACE
1. Place cover in position and install three attach-
ing screws. Tighten to 12 lb. ft.
2„ Install two side clips.
TIMING BELT ADJUSTMENT PIOCEDU1E
TIMING BELT ADJUSTMENT
NOTE: Engine should be at room temperature
whenever timing belt tension is checked.
1. Remove timing belt top front cover.
2
a
Using J 22232-2 calibration bar as shown in
Fig. 6-12) set pointer of tension fixture J 22232-1 to
line up with mark on minus side.
NOTE: This calibration must be performed prior
to each use of the J 22232 fixture to insure an
accurate timing belt adjustment.
3. Remove the camshaft sprocket to camshaft bolt
and washer and install J 22232-1 tension fixture on
the belt with the rollers on the outside (smooth) sur-
face of belt, Thread the fixture mounting bolt into
camshaft sprocket bolt location finger-tight.
4. Squeeze indicator end (upper) of fixture and
quickly release, so that fixture assumes released or
relaxed position.
5. With J 22232-1 installed as above, adjust acces-
sory drive housing (Fig. 6-11) up or down as required
to obtain a tension adjustment indicator centered in
the green range with drive housing mounting bolts
torqued to 15 lb„ ft.
6. Align belt on pulley by rotating engine 1/2 turn
using socket and bar on harmonic balancer retaining
bolt, and re check tension.
CA UTION: Be certain ignition is off.
7. Remove tension fixture and replace sprocket
retaining bolt making sure threads and washer are
free from dirt.
8. Install upper front timing belt cover.