6-44
1968
PONTIAC
SERVICE
MANUAL
2.
Straighten tabs on manifold front and rear in-
dividual
bolt locks and remove manifold attaching
bolts, manifold, and gaskets.
NOTE;
Locks
are used on front and
rear
pairs
of
bolts
only.
REPLACE
1.
Thoroughly clean gasket surfaces of cylinder
head and exhaust manifold. Check condition of heat
control valve and related parts.
2.
Replace exhaust manifold and new gasket. Use
new individual manifold bolt locks on front and rear
pairs
of bolts.
NOTE:
Place
manifold outlet in position over end
of
exhaust pipe but do not permit weight of mani-
fold
to rest on exhaust pipe. Since the end holes
of
gasket are slotted, installation of gasket may be
simplified
by
first
installing manifold, using only
the front and
rear
bolts to retain manifold. Allow
clearance
of about 3/16
fl
between cylinder head and
exhaust manifold. After inserting gasket between
head
and manifold, the remaining bolts may be
installed.
3.
Tighten all
bolts
evenly and securely to 301b. ft.
torque. Bend tab of screw locks against bolt heads.
NOTE:
Be sure tabs are bent against sides of bolt
heads,
not on top of bolt heads.
4. Attach exhaust pipe to manifold with
bolts
and
tighten to 30 lb. ft.
LEFT
SIDE EXHAUST
MANIFOLD
OR
GASKET-
REMOVE
AND
REPLACE
REMOVE
1. Remove generator belt and remove generator
and
mounting bracket as an assembly.
2. Disconnect exhaust pipe from manifold.
3.
Remove carburetor air pre-heater shroud.
4. Straighten tabs on manifold individual bolt locks.
(Tabs
can be straightened from beneath car by using
long-handled screwdriver.)
NOTE:
Locks
are used on front and
rear
pairs
of
bolts
only.
5. Remove manifold attaching
bolts
and remove
manifold.
REPLACE
1.
Thoroughly clean gasket surfaces of cylinder
head and exhaust manifold.
2. Place manifold in position against cylinder head
and
install two end bolts, finger tight.
3.
Slide gasket
between
manifold and cylinder
head.
4. Install remaining
bolts
and new bolt locks.
5. Tighten all
bolts
evenly and securely to 30 lb.
ft. torque. Bend tabs of bolt lock against bolt heads.
6. Install carburetor air pre-heater shroud.
7. Attach exhaust pipe to manifold and tighten to
30 lb. ft. torque.
INTAKE
MANIFOLD
OR
GASKET-
REMOVE
AND
REPLACE
REMOVE
1.
Drain
water from radiator and from each side
of cylinder block.
NOTE:
Most water can be drained from the block
through
radiator drain by
raising
rear
end of car
approximately 15 to 18"
off
floor.
2. Remove air cleaner and disconnect closed ven-
tilation pipe at air cleaner, air cleaner vacuum
source at manifold and hot air duct by loosening
clamp holding
elbow
to snorkel.
3.
Remove water
outlet
fitting
bolts
and position
fitting out of way, leaving radiator
hose
attached.
4. Disconnect heater
hose
from fitting.
5. Disconnect wire from thermogauge unit.
6. Remove spark plug wire brackets from manifold.
7. On cars equipped with power brakes, remove
power brake vacuum pipe from carburetor.
8. Disconnect distributor to carburetor vacuum
hoses.
NOTE:
Vacuum
retard
hose is located at lower
rear
of vacuum unit.
9. Disconnect fuel line connecting carburetor and
fuel pump.
10. Disconnect crankcase vent
hose
from intake
manifold.
11. Disconnect throttle rod from carburetor.
12. Remove screws retaining throttle control
bracket
assembly.
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