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301-350-400 V 8 ENGINE VI CODES Y-P-Z
6A5-9
Fig. 6A5-16 Removing Stuck Plunger
Figure 6A5-17 shows the relative position of component
parts of valve lifters. The recommended
for
assembly is given in the following steps.
LIFTER BODY
CHECK VALVE
rlNER
BALL CHECK
YALVE
PLUNGER
BALL CHECK
VALVE SPRING
(HIGH BALL LIFTER ONLY)
I
ROD
ROCKER FEED M E T E R I ~ G
VALVE
/
RETAINER SPRING
1268
Fig. 6A5-17 Hydraulic Valve Lifter - Exploded View
1. Rinse plunger spring and ball retainer and position
retainer in spring.
2. Rinse lifter ball and place it and the small spring 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 lifter body, install body over spring and plunger.
5. Place lifter body on clean paper, rinse and install push
rod seat and retainer ring.
6. After lifter has been assembled, place in lifter box and
close lid to preserve cleanliness.
Test Leak-Down Rate
After all lifters have been assembled, the leak-down rate
must be checked before they are installed in the engine. Valve
lifter leak-down tester 5-5790 (Fig. 6A5-18) is designed to test
leak-down rate of lifters 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:
-
- -~ -
-
Fig. 6 A 5 - 1 8 Testing Leak-Down Rate
1. Fill tester cup to approximately one inch from top
with special fluid which is available from tester manufacturer.
2. Swing weight arm up out of the way, raise ram, and
position lifter into boss in center of tester cup.
3. Adjust ram (with weight arm clear of ram) so that the
point is positioned on the set line (marked "S"). Tighten jam
nut to maintain setting.
4. Operate lifter through full travel of plunger by
pumping weight arm to fill lifter with test fluid and force out
air. (Lifter 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 and commence turning crank
slowly (1 revolution every 2 seconds).
Time indicator travel from lower line (first line above
set line) to line marked .094 or 3/32", while still rotating cup
with crank (Fig. 6A5-18). Lifter is satisfactory if rate is
between 12 and 90 seconds.
CYLINDER
HEAD OR
GASKET
Remove
1.
Drain cooling system, including block.
2. Remove intake manifold, push rod cover, and rocker
arm cover.
3. Loosen all rocker arm retaining nuts and move rocker
arms off push rods.
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