Valve Springs, Shield Or Seal- Remove And Replace - Pontiac tempest 1968 Service Manual

SIX C Y L I N D E R E N G I N E
6-15
Fig. 6-22 Testing Leak Down Rate
2. Rinse check ball and place in retainer.
3. Rinse plunger and place on retainer so that seat
on plunger mates with ball.
4
0
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
0
After adjuster has been assembled, place in ad­
juster box and close lid to preserve cleanliness.
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 ad­
justers to determine whether or not they are within
specified limits,, As with previous service opera­
tions concerned with lifters, cleanliness is para­
mount. 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. F i l l 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. Adjust ram (with weight arm clear of ram) so
that the pointer is positioned on the set line (marked
S). Tighten jam nut to maintain setting.
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 sev­
eral 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
i s satisfactory if rate is 34 seconds or above when
temperature is between 70°-90°.
VALVE SPRINGS, SHIELD OR SEAL-
REMOVE AND REPLACE
REMOVE
1. Remove rocker arm cover assembly.
2. Remove rocker arm of valve to be serviced.
3
0
Remove spark plug from cylinder of valves to
be serviced and install J 22278 (Fig. 6-23).
CAUTION: If piston is not in its full down posi­
tion, fan will turn.
4. Connect air hose with a constant source of com­
pressed air to J 22278.
5. Install hook end of tool J 22263-2 into oil feed
hole in lash adjuster bore (Fig. 6-23).
Fig. 6-23 V a l v e Spring Removal Hook-Up