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I
To perform the repair, place a
sheet
of
fine
gril
emerypapcroncheflatsurface,andrework
th
e
cylinder head. The
condition
of the ma-
chined surfacc
can
bc
checked by
using
prussi-
an blue or red lead
(Fig. 18).
Inspect the valve
~eat
STANDARD:
1.0-
1.3
mm
17
(0.04 -0.0Sin.)
SERVI CE LIMIT:
2.0
mm (0.08
in.)
If
the seat
1s too wide. too narrow,
or has
low spots, the
seat
must be
ground.
If the
valve
seats
mus! be ground, the
use of
a
power grinder
is
recommended.
Valve
Seat
Outside Diameter
mm
(mch.)
~~~a-~~~-
~
ST
l-0
ST
70
CT70, Kl,
K2,
K3
Cr70
H, HKI
0,889(22.5
)
o.
767
(19.5)
0.964
(24.S)
0,846(21.5)
' " " ~ '
,,,.,:,,.~
'
,,;:fa'"
•
i
t3)PI
NI{
I
FiJ.!.
19
Caution
:
Use
the
Vl'llfe
seal
grinder (Tool
No.
07782-
0020000, A HI) 10 corr«:!
thl'
1ahe ~eat
"idth
and
contact.
Read
valve seat grinder
the
instruelions cartfull)'.
111 PINK
12) BLUE
1---1,
~Yr50
IC,.______
______,,)137
5 0
( STSO)
I
(STSO)
IN
: 07783-0050
100
{23
mm)
IN: 07783-0030200
(23
mm)
EX:
07783-0050
100
(23 mm)
EX:
07783-0030100
(2
1
mm)
(CT70,
STIO)
(
CT70,
ST70)
IN:
07783-0050300
(29 mm)
EX: 0778 3-0050200
(26mm)
..,..,.._,
IN:
07783-0030500(29mm)
EX:
07783-0030400
(26 mm)
Fig. 20-l
I
131
WHITE
1
~ 4 5 °
"-
I
( STSO)
JN:
07783--0049200
l24mm)
Ex:
07783-0040100
(2
1
mm)
(
CT70, ST70
>
IN:
07783-0040400
(29mm)
EX: 07783---0040300
l26mm)
Fig.20-3
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