Pontiac firebird 1968 - Page 263

6-46
1968 PONTIAC SERVICE MANUAL
J 8929
Fig. 6-78 Compressing Valve Spring
J 8929-2. Install valve stem seal (Fig. 6-79) and
retainer cup locks. Remove spring compressor and
valve holder, then test valve stem seal, using suction
cup end of tool J 22330 (Fig. 6-80).
2. Install rocker arm, tighten rocker arm ball
retaining nut to 20 lb. ft. torque.
3. Remove air fitting J 22278.
4. Replace rocker arm cover, spark plug, dis-
tributor cap and connect spark plug wire.
Fig. 6-79 Installing Valve Stem Seal
J 22330
IK
Fig. 6-80 Checking Valve Stem Sea!
PUSH ROD OR VALVE LIFTER-
REMOVE AND REPLACE
REMOVE
1. Remove intake manifold, retaining O-ring seal.
2. Remove push rod cover.
3. Remove rocker arm cover.
4. Loosen rocker arm ball nut and move rocker
arm off push rod.
5. Remove push rod.
6. Remove lifter. Hydraulic valve lifter remover
J 3049 may facilitate removal of lifter.
NOTE: If more than one lifter is to be replaced,
store push rods in a stand and lifters in a lifter
box so they can be re-installed in exactly the same
place and position. See GENERAL INFORMATION
ON ENGINE SERVICE.
REPLACE
NOTE: If new lifter is to be installed, be sure to
remove all sealer coating from inside of new lifter
and check leak-down rate.
1. Place new lifter in lifter boss.
2. Replace push rod exactly as removed (same end
against rocker arm).
3. Position rocker arm on push rod and tighten
rocker arm ball retaining nut to 20 lb. ft. torque.