Lash Adjuster-Clean And Inspect; Lash Adjuster-Assemble; Lash Adjuster-Exploded View - Pontiac Grand Prix Service Manual

SIX CYLINDER ENGINE 6-13
CAUTION: Lash adjuster body and plunger are
selectively firted and must not be interchanged with parts
of other adjusters. Keeping all parts of adjusters together
will 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 chambers, a
tray and a cover. One chamber is for cleaning solvent
and the other is for kerosene. Whenever the tank is not
being used (and when parts are soaking), the cover
should be closed.
1. Before placing tray of parts in cleaning solvent, fmt
immerse it in kerosene chamber to remove as much
engine oil as possible. (This reduces contamination 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 effective-
ness 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 sufficiently
softened to permit removal by wiping, suspend 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).
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.
VALVE
PLUNGER
BALL CHECK VALVE
RETAINER
SPRING
Clean plunger and external and internal surfaces 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 tor 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 normally 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 assem-
bly. This rule does not apply to the slight edge which
may sometimes be present where the 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 defective condition.
Sometimes discoloration serves to highlight slight
grinder chatter marks and give the outer surface of
plunger a ridge or fluted appearance This condition
will not cause improper operation, therefore, 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 excessive 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. A N parts should be rinsed in
clean kerosene and assembled without dtying. A small
,
container with clean kerosene (separate fiom cleaning
tank) should be used for each set of adjusters being
overa hauled.
Fig 6-20 shows the relative position of component
parts of lash adjusters. The recommended procedure
for assembly is given in the following steps.
1. Rinse plunger spring and ball retainer and position
Fig. 6-20 Lash Adjuster-Exploded View
retainer in spring.