Chevrolet 1980 Light Duty Truck Service Manual page 431

Fig. 6A1-13--Removing Ball Check Valve
bore, if the bottom of the lifter is scuffed or worn inspect
the camshaft lobe, if the push rod seat is scuffed or worn
inspect the push rod.
An additive containing EP lube, such as EOS, should
always be added to crankcase oil for run-in when any new
camsahft or lifters are installed. All damaged or worn lifters
should be replaced.
For proper lifter rotation during engine operation, lifter
foot must be convex.
Assembly
1. Place the check ball on small hole in bottom of the
plunger.
Fig. 6 A 1 - 1 4 — Installing Ball Check Valve
Fig. 6A1-1 5--Assembling Hydraulic Lifter
2. Insert check ball spring on seat in ball retainer and
place retainer over ball so that spring rests on the ball.
Carefully press the retainer into position in plunger with the
blade of a small screw driver (fig. 6A1-14).
3. Place the plunger spring over the ball retainer and
slide the lifter body over the spring and plunger, being
careful to line up the oil feed holes in the lifter body and
plunger.
4. Fill the assembly with SAE 10 oil, then insert the
end of a 1/8" (3mm) drift pin into the plunger and press
down solid. (Do not attempt to force or pump the plunger).
At this point oil holes in the lifter body and plunger
assembly will be aligned (fig. 6A1-15).
5. Insert a 1/16" (1.6mm) drift pin through both oil
holes to hold the plunger down against the lifter spring
tension (fig. 6A1-15).
6. Remove the 1/8" (3mm) drift pin, refill assembly
with SAE 10 oil.
7. Install the metering valve and push rod seat (refer
to fig. 6A1-12).
8. Install the push rod seat retainer, press down on the
push rod seat and remove the 1/16" (1.6mm) drift pin from
the oil holes. The lifter is now completely assembled, filled
with oil and ready for installation.
Installation
1. Coat foot of valve lifters with "Molykote" or its
equivalent. Install valve lifters.
2. Using a 1/8" (3mm) bead of RTV, #1 0 5 2 3 6 6 or
equivalent, on the covers, install push rod side covers and
torque bolts to specifications.
3. Install distributor cap.
4. Install push rods and adjust valve mechanism as
outlined.
5. Adjust ignition timing and carburetor idle speed.
IN-LINE 6 6 A 1 -13
LIG H T T R U C K SER V ICE M ANUAL