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Trac:tors,
Lawn
and
Garden
-
110
and
112
Engine
20
S1\1
-2059-
(Apr
- 67)
Cylinder
Head
and
Valves
-
Tecums
eh
30-11
Item
Valve
guides,
STD
dia.
Valve
guides,
ove
rsize
dimension
Valve
seat
width
Valve
face
width
Valve
margin
Valv
e
spring
squareness
Valve
spring
compressed
t
ension
Valve
sprin~
free
length
Valv
e
stem
dianlCtcr
Intake,
standard
Exhaust,
s
tandard
Tntake.
oversi
ze
Exhaus
t,
oversize
Cylinder
head
flatness
SPECIFICATIONS
HH100
TECUMSEH
ENGTNE
Ne
w
Part
D
imension
0.312
to
0.
313
inch
0.343
to
0.344
inc
h
0.042
to
0.052
inch
0.089
to
0.099
inch
1/ 16
inch
1/ 32
to
1/ 16
inch
19-21
Ibs.
at
1-21
/ 32.iI1Ch lengi:h
2-1
/ 8
in
ch
0.309-0.310
inch
0.308-0.309
inch
0.340-0
.341
in
ch
0.340-0
.341
inch
Con
ta
c t
at
a
ll
pOints
Wear
Tolerance
0.083
inch
1.
'
32
inch
3/
32
in
ch
I1eplace
warped
head
TABLE
OF
ENGTNE
CLEARANCES
Item
Clearance
Valve
clearance
(both)
co
ld
0.010
inch
TORQUE
FOn
HARDWAHE
Loc
ation
Torque
Cylinder
head
bolts
200
in-H)s
Spark
plug
(cold)
15-20
ft-Ibs
TU
NE-UP
DATA
I
tcm
Engine
compression
Spark
plug
gap
Valve
face
angle
Valve
seat
angle
Crankcase
vacuum
U
-tube
manometer
Specification
s
60- 100
psi
0.030
in
ch
46"
7-12
inches
water
co
lumn
Litho
in
U.S.
A.