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Before installing the v.1v., lap the valve and
soat,
using 'he
lapping
compound.
Check for contact
pattern oft.r lapping, using a paste of red lead to
visualize the pattern. The pattern s.houJd be
uni·
fonn
and
continuous.
(6) Valve
",a'
,.movallllld
installation
To remove
th~ v~Jye
seal,
thin
it
in
place
by
cuttmg
with
n
rotary
cutter,
and break it
loost
with
a chisel,
taking
eare not
to
nick the
counter·
bore
in
which the
seal
is
seized
by
expansion
fitting.
To
insert the replacement
seat
,
chill
it
first
to
aboul
-80·
C
(-
112°F).
This
low
temperature can
be reached
by
immersing the
sea! in
a
pool of
eith" or alcohol and
by
placing
dry
ice
in the
pool. Force the chilled seat
into
the counterbore
,
which has been
trimmed
clean and
smooth,
and
calk
around the
seat
with
the
calking
tool
(31391.
130
I
0
for intake
valve or
3
1391 -13020
for exh,ust
valve).
•
34.6
mm
(eKheLlu'
r-f
I
42.6
mm lints ks I
J..
3
c
'·Tool
body
2
·Valva
S4Iilt
3~'r'l
in
do
r
hsa
4Na l .... guide-
5..calking
ring
installing \lalve seat by using calk iog tool
Valve spring
inspection
Inspect
each spring for cracks, and check
il
for
,qUOte-
ness,
free length and as-installed length against these
speclfic.lions:
MAINTENANCE AND ADJUSTMENT
Unit:
mm
fin .)
Item
Standard
Repair"
limit
Val;'.
sp'ing
48.85
47.6
f,e.
length
(1.923)
(1.874)
V.lve sprin!
0.4/25,
max.
squareneS$
(0.016/0,98),
max
.
As-installed
43
44
length
(1.693)
(1.732)
Checking
valve spring
for
square
ness
Rocker ann
and lo.cker
shaft inspection
(I)
The valve-actuating tip of the rocker arm
IS
subject
to weal,
If
the tip face
is
excessively worn. replace
the rocker arm.
(2) Tak.
diameter
readings
on
lbe
bushings
and the
rocker
3rm
shaft,
and
compute the
radial
clearance
from these r.cadjngs
.
If
the
limit
is exceeded.
reduce
the clearance
by
replacing. the bushings
O[
locker
ann
sh.f
t.
Unit: mm {In..)
Item
Standard
Repair
limit
B
.. hing bore
20 +0.021
-0
diameter
(0.787 j.00083)
Rock.r shaft
20 -0.016
-0.034
diameter
-0.00063
(0.787
-0.00134)
Shaft
c1emnce
0.016
-
0.055
0.Q7
in bushing
(0.0006 - 0.0022)
(0.0028)
-
- -
53
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