6-48
1968
PONTIAC
SERVICE
MANUAL
VALVE LIFTER—CLEAN
AND
INSPECT
Wash
tank J 5821 Is recommended for cleaning
valve lifter parts.
This
tank consists of two cham-
bers,
a tray and a cover. One chamber is for clean-
ing solvent and the other is for kerosene. Whenever
the tank is not being used (and when parts are soak-
ing),
the cover should be closed.
1.
Before placing tray of parts in cleaning solvent,
first
immerse it in kerosene chamber to remove as
much
engine oil as possible.
(This
reduces con-
tamination of solvent, thus prolonging its useful life.)
2.
Submerge tray in cleaning solvent and allow to
soak for approximately one hour. More time may
be required depending on varnish condition and effec-
tiveness of solvent.
Light
agitation of tray in solvent
at
10-15
minute intervals
will
hasten cleaning action.
3.
After varnish has dissolved or has been suffi-
ciently
softened
to permit removal by wiping, sus-
pend tray above solvent, utilizing hooks on tray
handles. Allow tray and parts to
drain
for a brief
period.
4.
Rinse tray of parts in kerosene chamber to cut
solvent and to avoid
injury
to hands (from solvent) .
Do
Wipe out tank cover and place tray of parts on
cover in front of tank (Fig.
6-81).
A shop towel
under
tray and clean paper on remainder of cover
will
enhance cleanliness.
NOTE:
Absolute cleanliness can be
assured
if
each
lifter
is inspected and assembled after
clean-
ing
before proceeding to the next
lifter.
6.
Working on one lifter at a time and using clean,
lint-free cloths, thoroughly wipe
^
off lifter parts.
Clean
plunger and external and internal surfaces of
body with
hard
wiping action. A bristle brush may
be used to clean internal surface of lifter body.
CA
UTION:
Do not use
wire
brush or sand paper,
since
damage to machined surface is likely.
7. Inspect lifter body. Both inner and outer
sur-
faces of lifter body should be inspected for scoring.
Lifter
assembly should be replaced if body is roughly
scored, grooved, or galled. Inspect cam contact
surface
on lower end of lifter body. Replace lifter
assembly if this surface is excessively worn, galled
or
otherwise damaged.
8.
Inspect lifter plunger. Using magnifying glass,
inspect check
ball
seat for defects. Inspect outer
surface
of plunger for scratches or scores.
Small
score marks with rough, satiny finish
will
cause
plunger to seize when hot but operate normally when
cool. Defects in check
ball
seat or scores or
scratches on outer surface of plunger which may be
felt with fingernail are causes for replacing lifter
assembly.
This
rule
does
not apply to slight
edge
which
may sometimes be present where lower end
of plunger extends below the ground inner surface of
body.
This
edge
is not detrimental unless it is sharp
or
burred.
A
blackened appearance is not a malfunctioning
condition. Sometimes discoloration serves to high-
light slight grinder chatter marks and
give
the outer
surface
of plunger a ridged or fluted appearance.
This
condition
will
not cause improper operation,
therefore, it may be disregarded.
9. Inspect push rod seat. Inspect push rod seat
for roughness and make sure that hole in center
is open.
10. Inspect valve lifter
ball.
Carefully examine
ball
for nicks, imbedded material or other
defects
which
would prevent proper seating. Such
defects
may cause intermittently noisy lifter operation. Also
inspect plunger face of
ball
retainer for excessive
wear.
VALVE LIFTER-ASSEMBLE
NOTE:
All parts must be absolutely clean when
assembling
a hydraulic
lifter.
Since
lint and dust
may adhere to parts they should not be blown off
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
lifters
being overhauled.
Figure
6-84
shows the relative position of compo-
nent parts of valve lifters. The recommended pro-
cedure for assembly is given in the following steps.
1. Rinse plunger spring and
ball
retainer and po-
sition retainer in spring.
2. Rinse lifter
ball
and place in retainer.
3.
Rinse plunger and place on retainer so that
seat on plunger mates with
ball.
BALL
CHECK
VALVE
RETAINER
/
LIFTER
:-../
PLUNGER
/
/
BODY
4"
PLUNGER
/
/
/
PLUNGER
1
PUSH
ROD
SEAT
SPRING
/
/
s
BALL
CHECK
/
X
/
BALL
CHECK
VALVE
SPRING
VALVE
ROCKER
FEED
/
METERING
VALVE
RETAINER-^
.
RING
Fig.
6-84
Hydraulic
Valve
Lifter—Exploded
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