Rocker Arm Or Hydraulic Valve Lash Adjuster; Lash Adjuster-Disassemble; Rocker Arm And Lash Adjuster; Hydraulic Lash Adjuster Recondition - Pontiac Grand Prix Service Manual

6-12
1969
PONTIAC SERVICE MANUAL
I
DIAL
INDICATOR
HYDRAULIC LASH ADJUSTER-RECONDITION
Fig. 6-18 Measuring Camshaft End Play
NOTE: Owner should be advised to follow recommended
runningdn procedure following camshafr replacement.
ROCKER ARM OR HYDRAULIC VALVE LASH
ADJUSTER
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:
a. Remove rocker arm.
b. 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 hammer.
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 location.
2. Install rocker arms and cover assembly.
NOTE: Because of the important part hydraulic lash
adjusters play in the operation of an engine and the close
tolerances to which they are manufactured, proper
handling, and above all, -cleanliness, cannot be
overstressed when servicing these parts.
New adjusters are serviced as individual units pack-
aged with a plastic coating. Leave the coating on until
ready to check leak-down rate. It is necessary 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 adjusteis. 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 'covered
box which will aid in keeping them clean. The box
should be kept dry and as free of oil as possible.
4
LASH ADJUSTER-DISASSEMBLE (Fig. 6-20)
1. Remove plunger retainer with small screwdriver.
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.
3. Drain oil out of adjuster body and place all lash
adjuster parts in separate compartment of tray from
wash tank.
I
Fig. 6-19 Rocker Arm and Lash Adjuster