SIX CYLINDER ENGINE
6-13
adequate lubrication to the camshaft and
rocker
arm mating surfaces*
NOTE:
Owner should be advised to follow
rec-
ommended running-in procedure following cam-
shaft replacement.
ROCKER
ARM OR
HYDRAULIC VALVE LASH
ADJUSTER-REMOVE
AND
REPLACE
REMOVE
1. Remove rocker arm cover assembly.
2.
Remove rocker arm and hydraulic lash adjuster
assembly and store so that each assembly can be
installed in its original location.
If
a lash adjuster
becomes
stuck in the cylinder for
some
reason and normal
methods
of removal are
unsuccessful proceed as follows:
1. Remove rocker arm.
2.
Fill
the vent
hole
adjacent to the lifter with
engine
oil (see Fig. 6-24),
3.
Insert a 4" length of 3/16" diam. rod into the
vent
hole
and strike the end of the rod with a ham-
mer.
The
hydraulic
effect
of the oil on the base of the
adjuster
will
break it free from the locating bore in
the cylinder head,
REPLACE
NOTE:
If new lash adjuster is to be installed, it
will
be necessary to check the leak down rate and
prime
before installation.
1. Place hydraulic lash adjuster in original loca-
tion.
METERING.
VALVE
RETAINER
RING
PLUNGER
\
BALL
CHECK
\ RETAINER
PLUNGER
^ SPRING
ADJUSTER BODY
BALL
CHECK VALVE
Fig.
6-20
Lash
Adjuster—Exploded
View
2. Install rocker arms and cover assembly,
HYDRAULIC LASH ADJUSTER-RECONDITION
NOTE:
Because of the important part hydraulic
lash
adjusters play in the operation of an engine
and
the
close
tolerances to which
they
are manu-
factured,
proper handling, and above all, clean-
liness,
cannot be overstressed when
servicing
these parts
9
New adjusters are serviced as individual units
packaged with a plastic coating. Leave the coating
on until ready to check leak-down rate. It is neces-
sary
to remove the oil from new adjusters prior to
checking leak-down rate since special oil is in new
adjusters.
Fill
adjusters with SAE 10 oil before
checking leak-down rate.
Wash
tank and tray, J 5821, is recommended for
cleaning lash adjusters.
This
tank should be used
only for lash adjusters 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.
Adjusters
should at all times be stored in a cov-
ered box which
will
aid in keeping them clean. The
box should be kept dry and as free of oil as possible.
LASH
ADJUSTER-DISASSEMBLE
(Fig. 6-20)
1. Remove plunger retainer with small screw-
driver.
2. Remove plunger, ball, ball retainer and spring.
NOTE:
It may be necessary to soak an adjuster
having
a stuck plunger in cleaning solvent for
several
minutes in order to remove the plunger.
Fig.
6-19
Rocker
Arm and
Lash
Adjuster
3.
Drain
oil out of adjuster body and place all lash
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