Chevrolet 1973 Overhaul Manual page 157

6 -1 6 ENGINE
I. L i f t e r B o d y
2 P u s h R o d S e a t
3 M e t e r i n g V a l v e
4 C h e c k B a l l
5 C h e c k B a l l R e t a i n e r
Fig. 3 0 —Hydraulic Valve Lifter
VALVE LIFTERS
Disassembly
1. Hold the plunger down with a push rod, and
using the blade of a small screw driver, remove
the push rod seat retainer.
2. Remove the push rod seat and metering valve
(fig. 30).
3. Remove the plunger, ball check valve assembly
and the plunger spring.
4. Remove the ball check valve and spring by
prying the ball retainer loose from the plunger
with the blade of a small screw driver (fig. 31).
Cleaning and Inspection
Thoroughly clean all parts in cleaning solvent, and
inspect them carefully. If any parts are damaged or worn
Fig. 31—Removing Ball Check Valve
6 P u s h R o d S e a t
R e t a i n e r
7 P l u n g e r
8 C h e c k B a l l S p r i n g
9. P l u n g e r S p r i n g
the entire lifter assembly should be replaced. If the lifter
body wall is scuffed or worn, inspect the cylinder block
lifter 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 camshaft or lifters are
installed. All damaged or worn lifters should be replaced.
Assembly
1. Place the check ball on small hole in bottom of the
plunger.
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.
32).
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" drift pin into the plunger and press
down solid. At this point oil holes in the lifter body
and plunger assembly will be aligned (fig. 33).
CAUTION: Do not attempt to force or pump
the plunger.
5. Insert a 1/16" drift pin through both oil holes to
hold the plunger down against the lifter spring
tension (fig. 33).
6. Remove the 1/8" drift pin, refill assembly with SAE
10 oil.
Fig. 32 —In sta llin g Ball Check Valve
OVERHAUL MANUAL