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6A5-8
1977 PONTIAC SERVICE MANUAL
Replace
1. Coat lower stud threads with Pt.
#
1052080 thread
sealer or equivalent (301 engine only).
2. Install new stud and tighten to 50 lb. ft.
3. Install rocker arm and tighten nut to 20 lb. ft.
4. Install rocker arm cover using new gasket.
5. Fill radiator (301 only).
VALVE LIFTER
Remove
1. Remove intake manifold.
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 5-3049
may facilitate removal of lifter.
Replace
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. Install 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.
4. Install rocker arm cover.
5. Install pushrod cover using a continuous 1/8 inch
diameter bead of RTV sealer in place of gasket.
6. Install intake manifold using new gaskets and O-ring
seal.
HYDRAULIC VALVE LIFTERS
Recondition
Because of the important part hydraulic valve lifiers play
in the operation ofan engine and the close tolerances to which
they are manufactured, proper handling, and above all,
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.
VALVE LIFTER
Disassemble
1. Remove push rod seat retainer ring by holding seat
down with push rod while dislodging ring from lifter body
with a pointed tool (Fig. 6A5-15).
Fig.
6A5-15
Removing
Push
Rod Seat Retainer
2. Invert lifter and allow push rod seat and plunger to
slide out of body. If plunger sticks in body, place lifter in large
end of hydraulic valve lifter plunger remover, 5-4160, with
push rod end of lifter downward. Hold tool firmly in hand
with thumb over lifter body and sharply strike tool against
a block of wood (Fig. 6A5-16) until plunger falls out. (It may
be necessary to soak a lifter having a stuck plunger in cleaning
solvent for several minutes in order to remove the plunger).
3. Drain oil out of lifter body and place all valve lifter
parts in separate compartment of tray from wash tank 5-5821.
CAUTION: Valve lifer body and plunger are
selectively fitted and must not be interchanged
with parts o f other lifers. Keeping all parts o f
lifiers together will also aid in trouble diagnosis.
Clean and Inspect
Thoroughly clean and inspect lifter surfaces for nicks,
scratches or scores. Inspection of the check ball and seat
should be done with a magnifying glass. The lifter base should
also be inspected for wear. If heavy wear is indicated on the
cam mating surface, the same lobe of the cam should also be
checked.
C A U T I 0 N : Clean lifers using only approved
solvent and a sofi brush. Never use a wire brush
or sandpaper.
Assemble
All parts must be absolutely clean when assembling a
hydraulic lifer, Since lint and dust may adhere to parts, they
should not be blown o f f with air or wiped with cloths. All
parts should be rinsed in clean kerosene and assembled
without drying, A small container with clean kerosene
(separate from cleaning tank) should be used for each set of
lifiers being overhauled.
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