Filter
Top Products
20
Engine
Tractors.
Lawn
and
Garden
- 110
and
112
30-8
Cylinder
Head
and
Valves
-
Tecumseh
SM-2059-(Apr-67)
REMOVING
AND
INSTALLING
EXHAUST
CHECKING
VALVE
CLEARAN
C E
VALVE
SEAT
INSERT
M
5S70
Fig.
21
-
Re
mov
ing
Exhaust
Valve
Scot
Insert
To
remove
exhaust
valve
seat
insert,
use
extractor,
Figure
21,
or
a
valve
seat
puller.
Clean
seat
area
thoroughly
before
installing
new
ins
e
rt.
If
extractor
is
not
available,
break
insert
and
drive
out.
The
exhaust
valve
insert
is
retained
by
a
press
fit
only.
Chill
both
the
insert
and
driving
tool
in
dry
ice
before
pressing
insert
into
block.
Fig.
22-Check
i
ng
Valve
Clea
r
once
Valve
grinding
changes
the
lifter
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)
po
s
i-
tion.
If
breaker
pOints
are
properly
adjusted,
they
will
be
open
at
this
time.
It
is
important
that
this
procedure
be
followed
to
insure
that
the
exhaust
lifter
is
NOT
riding
on
the
EZEE-start
mechanism.
2.
Insert
valves
in
their
guides
and
hold
valves
firmly
on
seats.
3.
Check
clearance
between
bottom
of
each
valve
stem
and
its
lifter
with
a
feeler
gauge,
Figure
22.
Refer
to
"Specifications,"
page
30-11,
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.