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Section
5-Rocker Mechanism
,
Cylinder
Head
, Va lves, Va lve
lash
Adjustment, and Valve
Timing
19
Fig. 21-R efacing Valve
s
make
a preliminary
adjustment
before
startin
g
the
e
n-
gine.
If
the
valve
lash
adjustment
is
made
for
the
pur-
pose
of
engin
e
tune-up,
om
it
step (a)
and proceed
with
step
(b)
unde
r th
e
procedure
for
the
app
licable
engine.
(
1)
6·CYLlII'DER
ENG
I
NE.
(a)
PRELIMINARY ADJUSTMENT.
R
emove
th
e
va lve
rocker arm
cover.
R
otate
the
crankshaft
until N
o.
1
piston
is nea
r t op
dead
center
(
T .D.e.
) at the
end
of the
compression
stroke.
30°
ANGLE
WH EEL
FOR
BOnOM
OF
SEAT
60°
ANGLE
WHEEL
FOR TOP
OF
SEAT
Fig. 22-Refacing Valve Seal
6272
REFER TO
SPEC
IFICATIONS
6292
Fig
.
23-Va/ve Seal Widlh
NOTE
:
11'0.1
piston
is n ell. T.D.C.
at
the
end
of
I.he
co
m,
pression stro
k
e w
hen
bo
th
'valves are
closed and
th
e
timin
g
nwrk
on
tlt
e c
ranks
haft
clantpe
r is
in lin
e
wil
h I
.he pointe
r
.
Check the intake
a
nd
e
xhaust
valve
lash for
N
o.
1
cylinde
r
with a
feele
r gau
ge
(fig.
26).
If
the
lash is
not
to
specifications,
loosen the
ad
justing
screw
until
this
clearance
is
obtained.
Tighten
the
lock nut
without
moving the adj
usting
screw.
/'"~r
REFER
TO
SPECIFICATIONS
VAlV
SEAT
Fig.
24-Ex
hausl Valve Sea' Widlh-
Inserl -Type Seal Shown
6293
M
ake
two chalk
m
arks
on
the
crankshaft
damper
120
0
away
from
the timing mark ( 120
0
represents 1/3-
turn of
the crankshaft
or
1
/3
of the
way around the
d
ampe
r
circumference).
Turn the
crankshaft
1/3-turn in
the direction
of
rotation,
and check
the va
lve
lash of
No. 5
cylinder.
R
e pea
t
thi
s
operation for
N
o.3,
N
o.
6,
N
o.2,
and
No.
4
cy
linde
rs.
COUNTERBORE TO
ENGINE
SPECIFICA liONS
~2'~--~-------------t~~~~
EXHAUST
VALVE
PORT
6294
fig.
25-Counterbore for
Oversize Insert
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