6-14
1968 PONTIAC SERVICE
MANUAL
adjuster
parts
in
separate
compartment of tray
from
wash tank.
CAUTION;
Lash
adjuster body and plunger are
selectively
fitted and
must
not be interchanged with
parts
of other adjusters. Keeping all parts of ad-
justers
together
will
also aid in trouble diagnosis*
LASH
ADJUSTER-CLEAN
AND
INSPECT
Wash tank, J
5821,
Is recommended for cleaning
lash
adjuster
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
contam-
ination
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,
period.
Allow
tray and
parts
to drain for a
brief
4.
Rinse tray of
parts
in
kerosene
chamber
to cut
solvent and to avoid
injury
to
hands
(from
solvent).
5. Wipe out tank cover and
place
tray of
parts
on
cover In front of tank. A
shop
towel
under
tray and
clean
paper
on remainder of cover
will
ensure
cleanliness.
6. Working on one
adjuster
at a time and using
clean, lint-free cloths, thoroughly wipe off
adjuster
parts.
Clean plunger and external and internal
sur-
faces
of body
with
a hard
wiping
action. A bristle
brush may be
used
to clean internal
surface
of
adjuster
body.
CAUTION;
Do not use wire brush or sand paper,
as
these may damage machined surfaces.
NOTE;
Absolute cleanliness can be assured if
each adjuster is inspected and assembled after
cleaning
but before proceeding to the next adjuster.
7. Inspect
adjuster
body. Both inner and outer
surfaces
of
adjuster
body should be inspected for
scoring. Adjuster
assembly
should be replaced if
body is roughly
scored,
grooved, or galled.
8. Inspect
adjuster
plunger. Using a magnifying
glass,
inspect check
ball
seat
for
defects.
Inspect
outer
surface
of plunger for
scratches
or
scores.
Small
score
marks
with
a rough satiny
finish
will
cause
the plunger to
seize
when hot but
operate
nor-
mally
when cool. Defects in check
ball
seat
or
scores
or
scratches
on outer
surface
of plunger
which
may be
felt
with
a fingernail are
causes
for
replacing the
adjuster
assembly.
This rule
does
not
apply to the slight
edge
which may
sometimes
be
present
where the lower end of plunger
extends
be-
low
the ground inner
surface
of body. This
edge
is
not detrimental
unless
It Is
sharp
or burred.
A
blackened
appearance
is not a defective condi-
tion.
Sometimes
discoloration
serves
to highlight
slight
grinder
chatter
marks and give the outer
sur-
face
of plunger a ridged or fluted
appearance.
This
condition
will
not
cause
improper operation,
there-
fore,
it may be disregarded.
9. Inspect lash
adjuster
ball.
Carefully examine
ball
for nicks,
embedded
material or other
defects
which
would prevent proper seating. Such
defects
may
cause
intermittently noisy
adjuster
operation.
Also
inspect plunger
face
of
ball
retainer for ex-
cessive
wear.
LASH
ADJUSTER-ASSEMBLE
(Fig. 6-20)
NOTE:
All parts
must
be absolutely clean when
assembling a hydraulic lash adjuster. 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 kero-
sene (separate from cleaning tank) should be used
for
each set of adjusters being overhauled.
Figure 6-20
shows
the relative position of compo-
nent
parts
of lash
adjusters.
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.
CLEANING SOLVENT
\
KEROSENE
.../.:
_
•JfZ
IH8HHI
CLEANING
TRAYr---.
^
.^v-iCOVERi;"ICLEAN"
KEROSENE
Fig.
6-21
Lash
Adjuster—Wash
Tank
and
Tray
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