Advertisement
2-26
VALVE SERVICE
ENGIN E
(48)
Figure
2-20-Ad justing
Valve Lash
7.
Install r
ocker
arm cover,
making
sure that
gasket is in good cond
iti on
and
properly placed
to
prevent leakage
of oil.
Tighten
radiator cap.
2-1 5 IN ITIAL ADJUSTMENT AND
CLEANING OF HYDRAULIC
VALVE LIFTERS
NOTE:
Engine s
equipped with
hydraulic
valve lifters
are identified
by
RED
"
Buick
Fireball" lettering
on
rock er
arm cov er. A label
also is
placed
on th
e
cover, stating- " This
En-
uine Equipped
with
Hydmulic Lifters."
Hydraulic valve
lifters
eliminate the need
for service adjustment
; however,
an initial ad-
justment of
hydraulic
valve lifters is required
after the
valves
have been refaced, whenever
t
he setting of the adjusting ball stud is dis-
turbed for any
reason,
or whenever valve lifters
are removed and
installed.
If
the operation of a val
ve
lifter becomes
faulty due t
o
excessive
varnish
deposits or
presence of dirt it may be
disassembled and
cleaned.
As long as a valve lifter
operates prop-
erly, however, it
should
be lef t
alone.
It
should
not be disassembled and
cleaned
when removed
for other work but should be wrapped in clean
paper to avoid
entrance
of
dirt.
a
. Initial Adjust m e nt of Hydraulic
Valv~
Lifters
The initial adj
ustment
of a
ny
hydraulic
valve lift er
must be made
only when the lifter
is on the
camshaft
base
circle (off
the
cam)
.
1.
Crank engine over slowl
y
until
dist ributor
rotor
indicates
that affected cylinder is in fir
-
ing position,
which places both lifter s of this
cylind er
on
the camshaft base cir cle (off
the
cam)
, so that either
lifter
may be adjusted.
2. Turn adjusting ball
stud as required
until
all play of push rod
between
lifter and ball stud
is just
removed,
and
there is no lash clearance
in the valve train.
3.
Turn adjusting ball stud down exact ly 2
turns.
Check to
make sure
t
hat
oil gro ove on
ball stud is at least half
way down in rocker
arm so that it connects with
the
drilled oil
pas-
sage in r
ocker arm, then tighten the lock
nu
t .
4.
If
oil
groove
on
ball stud
is
not at
least
half wa
y
down in
rocker arm, turn ball
stud
down one
additional turn (total 3 turns
) and
tighten
lock
nut.
If
oil groove is still too high,
it will be
necessary to install
anot her pu
sh
rod
or lifter.
5.
When it
is
n
ecessa r y to adjust all
valve
lifters
in
an
engine,
time
may
be
saved
by
aligning
t
he
"D.D.C. 1-8"
mark on
flywhe el
.
with
index
mark in
ti
ming hole in
flywheel
hou
sing,
firs
t with
No.
1 cylinder and later
with
No. 8 cylinder in fir
ing
position
as in
di-
cated
by position of
distributor
rotor.
Adjust
lifters
accor ding to
the
followi
ng table
:
-No.1
Cyl.
Firing-
-
No. 8
Cyl.
Firing-
Valve
No.
Va lve
Val
ve
No.
Valve
1
#1
E
xh.
3
#2 Inlet
2
#
1 Inlet
5
#3
Exh.
4
#
2 Exh.
6
#3 Inlet
7
#4
Inlet
9
#5
Exh.
8
#4
E
xh.
10
#5 Inlet
11
#
6 Inlet
13
#7
Exh.
12
#6 Exh.
15
#8
Inlet
14
#7 Inlet
16
#
8
E
xh.
RETAINER
.
Fillure
2-21-Hydraullc
Valve Lifte
r,
Disassembled
b.
Cleaning of Hydraulic Valve Lifter
If
it
becom
es nece
ssa ry
t
o
clean a hydraulic
valve lifter
because of dirt or
va r nish, it is ad-
visable to clean all
other lifters
at
the
same
time
because
it is
likely that t
hey
may
success-
ively become
faulty
f
r om
t
he same
cause.
Advertisement
