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20
Engine
Tractors,
Lawn
and
Garden
-
11
0
and
112
10-6
Cylinder
Head
and
Valves
-
Kohler
SM-2059-
(Apr-67)
RECONDITIONING
OR
REPLACING
VALVES
Vali'e
Guides
Fig.
14-Measuring
Valve
Guide
s
and
SIems
Clean
th
e
valve
guides
first
to
assure
valve
ali
gnme
nt
when
cutting
valve
seats.
Use
valve
guide
c
leaner
to
clean
inside
of
valve
guide.
Then
measure
LD.
of
valve
guide.
and
O.D.
of
valve
stem,
Figure
14.
Refer
to
Specifications,
page
10-11,
for
clearance.
Re-
place
and
ream
guides
as
n
ecessa
ry.
Vall'e
S
eal
s
Broken
or
wor
n
exhaust
valve
seats
(i
ns
er
t)
may
be
replaced.
See
page
J
0-8.
Th
ey
are
either
stellite
Or
molychrome
nickel.
The
int
a
ke
valve
seat
is
ma
chi1\ed
into
the
cylinder
block
.
When
required.
an
intake
valve
se
at m
ay
be
installed.
See
page
10-8
.
Th
e
valve
seating
surface
"A,"
Figure
15,
should
be
he
ld
as
close
to
1/ 32
inch
as
possible.
Seats
with
more
than
1/
16-inch
seating
surface
should
be
narrowed
(
cu
t
back)
with
30°
cutters,
II
E,
" F igu r e 15.
The
valve
seat
angle'
'B"
depends
upon
valve
face
angle
"C."
New
valves
have
a 45 °
face.
Recondition
valve
seats
with
45°
cutters
and
lap
valves.
See
page
10-7.
/
M
5567
A.
Valve
Sealinq
Surface
(1/3
2
inch)
B.
Valve
Scat
A~91c
(45
0
)
C.
Valve
Face
Angle
(4
5")
D.
Valve
Margin
(1
, 16
inch)
E.
Seat
Narrowing
Angl e (3O")
Fig.
15-Va/ve
Seat
and
Surface
Dimension
s
VALlE
S
EII
T
r.U
i 1
ER
'J
II i
'iL
-=
=
::N~'CG@i'i
-
') [
11
]
I'
lilT
Fig.
16-Val
ve
Seal
Culler
This
valve
seat
cutter
will
cut
a
45°
valve
seat
and
narrow
the
seat
to
30°.
See
Special
Tools,
page
10-12,
for
tool
number
and
manufac-
turer.
When
reconditioning
valves,
be
sure
ther
e
is
no
more
than
1/
16-inch
and
no
less
than
1/64-
inch
margin
liD"
on
the
valve.
Litho
in
U.S.
A.