Filter
Top Products
20
Engine
Tractors,
Lawn
and
Garden
-
110
and
112
10-8
Cylinder
Head
and
Valves
-
Kohler
SM-2059-
(Apr-57)
REPLACING
VALVE
GUIDES-Continued
M
5571
Fig.
20--/ns,alling
Valve
Guides
Thoroughly
clean
hole
and
press
valve
guide
into
hole
1-5
/ 16
inches
from
top
of
block.
Aft
er
inst
a
lling
new
guide,
ream
hole
as
required
for
necessary
valve
clearance
in
guide.
Refer
to
Specifications,
page
10-11,
for
valve
guide
clear-
ances.
REPLACING
EXHAUST
VALVE
INSERT
M
55/0
Fig
2/.-Removing
Exl,aus'
Valve
Inser,
To
r
emove
exhaust
seat
insert,
use
extrac-
tor,
Figure
21
or
a
valve
seat
puller.
Clean
seat
area
thoroughly
before
installing
new
insert.
If
extractor
is
not
available,
break
insert
and
drive
out.
Exhaust
valve
insert
is
retained
by
press
fit
only.
Chill
both
the
insert
anddrivingtool
in
dry
ice
before
pressing
insert
into
block.
INSTALLING
INTAKE
VALVE
INSERT
If
the
intake
valve
seat
is
beyond
repair
in
the
cast
iron
block,
an
insert
is
available
for
serv-
ice.
Bore
block
to
depth
shown,
Figure
22,
and
install
insert
as
explained
above
for
exhaust
valve
inserts.
;'1·1
$'/
'}
F
,g.
22
-
In,ake
Valve
Sea'
CHECKING
VALVE
CLEARANCE
"
u·.,
Fig
23-Checking
Valve
Clearance
Valve
grinding
changes
the
tappet
and
valve
clearance.
After
grinding
or
installing
new
valves,
check
clearance
as
follows
:
1.
Rotate
crankshaft
until
piston
is
top
dead
center
(end
of
compression
stroke)
and
crank-
shaft
keyway
is
at
exactly
12
o'clock
(top)
posi-
tion.
If
breaker
points
a
re
properly
adjusted,
they
will
be
opening
at
this
time.
It
is
important
that
this
procedure
be
followed
to
insure
that
the
exhaust
tappet
is
NOT
riding
on
the
automatic
compression
release
mechanism
on
engines
so
equipped.
2.
Insert
valves
in
their
guides
and
hold
valves
firmly
on
seats.
3.
Check
clearance
between
bottom
of
each
valve
stem
and
its
tappet
with
feeler
gauge,
Figur
e 23.
Refer
to
Specifications,
page
10-11,
for
proper
valve
clearance.
Grind
off
tip
of
valve
stem
in
a
valve
resurfacing
machine
set
to
grind
a
perfectly
square
face.
Grind
tip
of
stem
until
proper
clearance
is
obtained.
Litho
in
U.S.
A.