Pontiac FIREBIRD 1972 Service Manual page 532

6-20 1972 PONTIAC SERVICE MANUAL
REPLACE
Install any new parts by reversing removal procedure
steps 2-5.
Install spark plug after removing valve train play.
With lifter on base circle of camshaft, turn rocker
arm down until valve train play is removed. Turn nut
down one additonal turn (Fig. 6-22).
Install rocker arm cover.
PUSH ROD OR VALVE LIFTER
REMOVE
Remove rocker arm cover.
Loosen rocker arm and rotate it for clearance from
push rod.
Remove push rod and store so that each push rod
may be installed in original location.
If hydraulic valve lifters are to be removed, proceed
as follows:
Remove spark plug from cylinder of valve train being
serviced.
Disconnect distributor primary lead.
6. L6osen coil mounting screw and rotate coil upwards.
7. Remove push rod covers.
8. Remove lifter. Hydraulic valve lifter remover 5-3049
may facilitate removal of lifter. Store lifters so that
they can be installed in exactly the same location.
I f new liftr is to be installed, be sure to remove dl
sealer coating from ins~de of new lifter and check
leak-do wn rate.
REPLACE
Place lifter in original lifter, boss.
Replace push rod exactly as removed.
Position rocker arm on push rod.
With lifter on base circle of camshaft, tighten rocker
arm nut until valve train play is removed. Turn nut
down one additional turn (Fig. 6-22).
Install spark plug.
Install rocker arm cover.
HYDRAULIC VALVE LIFTERS
RECONDITION
Fig. 6-22 Adjusting Valve Train Lash
Because of the important part hydraulic valve lifters play
in the operation of an engine and the close tolerances to
which they are manufactured, proper handling, and above
a//, cleanliness cannot be overstressed when servicing
these parts.
New lifters are serviced as individual units packaged with
a plastic coating. Leave the coating on until ready to check
leak-down rate. It is not necessary to remove the oil from
new lifters prior to checking leak-down rate since special
leak-down oil is already in new lifters.
Wash tank and tray, 5-5821, is recommended for cleaning
valve lifters. This tank should be used only for valve lifters
and should be kept covered when not in use. All servicing
should be done in an area removed from grinders or other
sources of dust and foreign material.
Lifters should at all times be stored in a covered box which
will aid in keeping them clean. The lifter box should be
kept dry and as free of oil as possible.