Pontiac tempest 1968 Service Manual page 231

6-14 1968 P O N T I A C SERVICE M A N U A L
adjuster parts i n 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 5 8 2 1 , Is recommended for cleaning
lash adjuster parts. This tank consists of two cham­
bers, a tray and a cover. One chamber i s 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 i n cleaning solvent,
f i r s t immerse i t i n kerosene chamber to remove as
much engine o i l as possible. (This reduces contam­
ination of solvent, thus prolonging i t s useful life.)
2. Submerge tray i n 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 i n solvent
at 10-15 minute intervals w i l l hasten cleaning action.
3. After varnish has dissolved or has been suffi­
ciently softened to p e r m i t 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 i n 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 w i l l 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 i f
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 w i l l
cause the plunger to seize when hot but operate nor­
mally when cool. Defects i n 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 i s 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 w i l l not cause improper operation, there­
fore, i t may be disregarded.
9. Inspect lash adjuster ball. Carefully examine
b a l l 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 - 2 0 shows the relative position of compo­
nent parts of lash adjusters. The recommended pro­
cedure for assembly i s given i n the following steps.
1. Rinse plunger spring and ball retainer and po­
sition retainer i n spring.
CLEANING SOLVENT
\
KEROSENE
.../.: _
•JfZ
IH8HHI
CLEANING TRAYr---. ^ . ^ v - i C O V E R i ; " I C L E A N " KEROSENE
Fig. 6-21 Lash Adjuster—Wash Tank and Tray