Chevrolet 1988 Light Duty Truck Repair Manual page 345

Figure 26— Removing the Check Ball Retainer
(Typical)
clean, lint-free shop rags. Work with clean
hands, on a clean work surface.
1. C heck ball (225) to the small hole in the bottom of
the plunger (226).
2. Check ball spring (225) to the check ball retainer
(223).
3. Check ball retainer (223) with check ball spring
(224) to the plunger (226). Make sure the spring
rests on the ball. C arefully press the retainer into
position in the plunger with the blade of a small
screw driver (figure 27). Make sure it seats tightly
against the plunger.
4. Plunger spring (222) to the check ball retainer (223).
5. Lifter body (221) to the plunger (226).
• Slide the lifter body over the plunger, being
careful to line up the oil feed holes in the lifter
body and plunger.
• Invert the assembly (open end up).
• Fill the assembly with SAE 10 oil.
GENERAL ENGINE MECHANICAL 6A-15
• Insert the end of a 3 mm (Vs-inch) drift into the
p lu n g e r and p re ss dow n s o lid ly . Do not
attempt to force or pum p the plunger. At this
point, oil holes in the lifter body and plunger
assem bly will be aligned.
• Insert a 1.5 mm (1 /i6-inch) drift through both oil
holes to hold the plunger down against the
plunger spring tension (figure 28).
• Remove the 3 mm (Vs-inch) drift. Refill the
assem bly with SAE 10 oil.
6. Metering valve (227) and pushrod seat (228).
7. Retainer.
• Push down on the pushrod seat (228), using a
pushrod. Remove the 1.5 mm (1 /ie-inch) drift.
• The lifter is com pletely assembled, and ready
to be installed or tested.
VALVE LIFTER LEAK-DOWN RATE
TEST (FLAT TYPE LIFTERS ONLY)
Tool Required:
J 5790 H ydraulic Lifter Leakdown Tester
Tool J 5790 (figure 29) is available for very accurately
checking the leakdown rate of the overhauled valve lifters.
This tool applies a measured load to the valve lifter, and
measures the am ount of valve lifter travel under load.
Instructions for use are furnished with the tool, along with
a supply of special test oil.
1. Fill tester cup to approxim ately one inch from top
with the special fluid w hich is available from tester
manufacturer.