Rocker Arm Or Hydraulic Valve Lash; Adjuster-Remove And Replace - Pontiac tempest 1968 Service Manual

SIX C Y L I N D E R E N G I N E 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. F i l l 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,
R E P L A C E
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
B A L L 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. F i l l 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