Lash Adjuster Test Leak-Down Rate; Valve Springs, Shield Or Seal; Lash Adjuster-Wash Tank And Tray; Testing Leak Down Rate - Pontiac Grand Prix Service Manual

6-14 1969
PONTIAC SERVICE MANUAL
CLEANING SOLVENT KEROSENE
4. Operate adjuster through full travel of plunger by
pumping weight arm to fill adjuster with test fluid and
force out air. (Adjuster must be completely submerged
at all times.
)
Continue pumping for several strokes
after definite resistance is detected.
5. Raise weight arm to allow plunger spring to expand
fully; lower arm onto ram.
Time indicator travel from lower line (first line above
set line) to line marked .125" or 1/8". Lifter is
satisfactory if rate is 34 seconds or above when
temperature is between 70"-90".
VALVE SPRINGS, SHIELD OR SEAL
Fig.
6-21
Lash Adjuster-Wash Tank and Tray
2. Rinse check ball and place in retainer.
3. Rinse plunger and place on retainer so that seat on
plunger mates with ball.
4. Invert plunger with parts assembled thus far and
after rinsing adjuster body, install body over spring
and plunger.
5. Place adjuster body on clean paper, rinse and install
retainer ring.
6. After adjuster has been assembled, place in adjuster
box and close lid to preserve cleanliness.
REMOVE
1. Remove rocker arm cover assembly.
2. Rwmove rocker arm of valve to be serviced.
.
3. Remove spark plug from cylinder of valves to be
serviced and install J 22278 (Fig. 6-2.3).
C A UTZON:
If
piston is not in its full down position, fan
will turn.
4. Connect air hose with a constant source of
compressed air to J 22278.
5. Install hook end of tool J 22263-2 into oil feed hole
in lash adjuster bore (Fig. 6-23).
1
I
LASH ADJUSTER TEST LEAK-DOWN RATE
After all adjusters have been assembled, the leak-
-down rate must be checked before they are installed
in the engine. Valve lifter leak-down tester, J 5790
(Fig. 6-22), is designed to test leak-down rate of
adjusters to determine whether or not they are within
specified limits. As with previous service operations
concerned with lifters, cleanliness is paramount. The
tester cup and ram should be thoroughly cleaned, and
testing should be done in an area free of dust and dirt.
The testing procedure is described in the following
steps:
1. Fill tester cup to approximately one inch from top
with SAE 10 engine oil.
2. Swing weight arm up out of the way, raise ram, and
position adjuster into boss in center of tester cup.
3. Adiust ram (with weight arm clear of ram) so that
the @inter is hsitionedY on the set line (marked S).
Tighten jam nut to maintain setting.
Fig. 6-22 Testing Leak Down Rate