Pontiac firebird 1968 - Cylinder Head or Gasket - Remove and Replace

6-16
1968 PONTIAC SERVICE MANUAL
6. Hold J 22263-2 in place and install fork end of
compressor J 22263-1 on J 22263-2 (Fig. 6-24).
7. Pivot J 22263 so that the recessed side of the
disc contacts the valve spring retainer cup shield.
8. Depress valve spring using compressor
J 22263-1 and remove valve spring retainer cup
locks, then both pieces of the valve spring compres-
sor, valve spring and retainer cup shield, valve stem
seal, and intake valve quick seal.
REPLACE
1. Install valve spring and valve spring retainer
cup and compress spring with both pieces of J 22263
(while holding valve up with compressed air and
J 22278).
2. Install valve stem seal, intake valve guide seal
and retainer cup locks. Remove both pieces of valve
spring compressor, then test valve stem seal using
J 22330.
When replacing intake valve guide seals, place
plastic installation cap over valve stem and push
valve guide seal into place using a seal installing
tool VSIT-1 (Fig. 6-25).
3. Replace spark plug.
4. Install rocker arm.
5. Install rocker arm cover assembly.
CYLINDER HEAD OR GASKET-REMOVE AND REPLACE
REMOVE
1. Drain cooling system and remove air cleaner.
Mm
"1*22263^
/(-• J22263-2
VENT HOLES
•.is**:-
Jul.
PLASTIC
INSTALLATION
CAP
SEAL INSTALLING
TOOL
INTAKE VALVE
GUIDE SEAL
r
Fig. 6-24 Valve Spring Removal
Fig. 6-25 Intake Valve Guide Seal Installation
2. Disconnect accelerator pedal cable at bell crank
on manifold and fuel and vacuum lines at carburetor.
3. Disconnect exhaust pipe at manifold flange, then
remove manifold bolts and clamps and remove mani-
folds and carburetor as an assembly.
4. Remove rocker arm cover assembly.
5. Remove timing belt upper front cover mounting
support bracket and rear lower cover.
6. Disconnect spark plug wires
0
7. Remove rocker arms and hydraulic valve lash
adjusters. Store rocker arms and hydraulic lash
adjusters so that they can be replaced in exactly the
same location.
8. Remove cylinder head bolts, cylinder head and
gasket. Place cylinder head on two blocks of wood
to prevent damage.
9. Clean gasket surfaces of cylinder head and
block
0
REPLACE
When installing new head, transfer all serviceable
parts to new head using new seals on intake and ex-
haust valve stems and new manifold gaskets.
1. After applying sealer, place a new cylinder head
gasket in position over dowel pins in cylinder block
(Fig. 6-26).
2. Carefully guide cylinder head into place over
dowel pins and gasket.
3. Start all bolts in threads.
NOTE: Bolts are of two different lengths. When
inserted in proper holes, all bolts will project an