Filter
Top Products
YL
I',
20
Engine
Tractors,
Lawn
and
Garden
- 110
and
112
30-4
Cylinder
Head
and
Valves
-
Tecumseh
SM-2059-(Apr-67}
REPAIR-Continued
It
is
not
nec
es
sary
to
r e
mov
e
the
engine
from
the
tractor
when
servicing
the
cylinder
head,
head
gasket,
muffler,
breather
assembly,
valves
and
valve
s e
ats.
lMPORTANT:
On
fraclol's
equipped
with
hy-
dYa.
ulic
lift,
do
nol
disconnect
t.he
hydyaulic
lines.
Remo
ve
the
pump,
valve
and
reservoirunU
from
the
top
oj
the
engine
and
lower
it
to
the
ground
with
the
hydraulic
lines
still
aUached.
This
PYO-
cedure
avoids
the
pass
ibi
lily
of
di
rl
ente
Ying
the
system.
Disconnect
throttle
and
choke
conduit
and
cable
end
at
carburetor
and
control
arm.
Remove
carburetor,
control
arm
and
breather
assembly,
he
ad
baffle,
cylinder
head
and
head
gasket.
REMOV1NG
VALVES
Fig.
7-Rcmovin
g
Valve
s
Use
a
spring
compressor
to
compress
valve
springs,
Figure
7.
Remov
e
ke
per
pins
from
valve
stem
and
lift
valves
from
e
ngi
ne
block.
Remove
valve
spring
retain
e
rs
and
valve
springs
from
valve
chamber
.
INSPECTING
C
YLINDER
HEAD
"',)
I
(
•
Fig
.
B-Cleaning
Cylinder
Head
Remove
all
deposits
from
combustion
cham-
ber
and
gasket
surface
of he
ad
with
a
scraper
and
a
wir
e
brush.
Be
careful
not
to
dama~e
the
cylinder
h
ea
d
gasket
surface.
Use
a
safe
cleaning
solvent
to
r
emo
ve
dirt,
glC'ase
and
other
deposits.
Check
th
e
cylinder
head
for
cracks,
broken
cooling
fins
and
inspect
th
e
gasket
surface
for
burrs
and
nicks.
Heplace
the
head
if
any
of
these
conditions
are
found.
J
Fig.
9-Checking
Cyl
ind
er
Hea
d
Surface
When
a
cylinder
head
is
removed
because
of
gasket
leaks,
check
the
flatness
of
th
e
cyl1nd
r
head
by
placing
it
on
a
surface
plate,
Figure
9.
Check
to
see
that
gasket
surfaces
make
con-
tact
at
all
points.
Replace
the
cylinder
head
if
it
is
warped.
NOTE:
Always
use
new
head
gasket
aftery
c-
moving
cylinder
head.
Litho
in
U.S.A.