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T r
actors
,
Lawn
and
Gar
den -
110
and
112
En
gi
ne
20
S
M-
205
9-(A
p
r-57)
Piston
, Cr
anks
h
aft
a
nd
Flywh
e
el
-
Kohl
er
15
-7
PI
'
, ! ,
F ig .
)
4-Mea
, u
ri
n9
P
is
ton P in
and
Piston
Mea
u r e piston
pin
to
pis
ton
el
ear
an
ce w
it
h
micr
om
ete
r.
Re
a m
out
p
is
ton a
nd
rod
and in -
s ta
ll
ov er s i
ze
pla
t n pi
ns
when
nee s s ar
y.
See
Spec
ifi
ca
ti
ons,
pa
ge
15- 18.
Over
s
ize
pi
s
ton
p
ins
are
av
a
ilable
f
or
s
er
vi
ce
.
Fig.
1)
-Meo
su
ring
J1
i
",
to
n
Check
the
pis
to
n-
to
- c
yli
n
der
bo
r E cl
ea
r an
ce
by m s
urin
g the
pist
oll
and
bor e
diame
t
1'5
,
F i
p;
u
res
15 a
nd
23.
Meas
ur
the
out
si
de di
amete
r of
th
p
iSt
on
wi
th
a m
ic
r o met
~r
at
th
ce
n
te
r
li
ne
of the
pist
on
pin
b
ore
and
at
90' to
th
pin
bo
r
ax
i
s.
If
plst n
-to-c
y
li
n
de
r
bore
cl
ear
nce
is 0.005 -
inc h or l
es
s .
deg
l
aze
the
cylin
de r
walls
and
in -
sta
ll
a
set
of
h
eavy-d
uty r in
gs.
If
cy
lin
d
er-to-bore
clearan
ce
is
mo
r e
than
0.0
05-
inc
h t
he
c
yli
nder
will
h
av
e to b r b
or
ed
a
nd
ov r s
ize
pi
ston
and
rin
gs in s
talled.
Ov
ers
ize
pi
s
tons
and
rin
gs
are
a
vail
ab
le
in
0.0
10-inch,
0.0
20 -
inch
and
O.030-incl
l
si
ze
s
for
s
ervi
ce.
See page
15-11
for
de
g
lazing
and
bo
ri
ng
in-
f
or
ma
ti
on.
PIST
ON ANALYSIS
\ ' , (
Fig. 16-
P,
,,
on
To
p
Lan
d Bu
rni
ng C
au
sed by
Det
o
nati
o
/l
D
to
na
ti
nn is a fo
rm
of
abnorm
a l c
ombu
s
tion
caus ing
ex
e
's
iv
e te
mp
er a
ture
a
nd
pr
ess
ur
e in
the
co
mbus
ti
on
ch
a
mb
e
r.
Commonly
ca
ll
ed c
ar
-
bo
n
knock
,
spark
kno
ck or
tirnin
g
kn
o
ck
.
de
-
tonat ion oc cu r s
as
c
om
pr e s ed
air-
fuel m
ixtu
r
ign
it
es
spontan ou
ly
to
int
rr
upt the
no
r
ma
l
ign
it
ion
fl
ame
ft
·ont. W
hen
de
tona
ti
on is
de
tected
check
an
d c
orr
ect. the
foll
ow in g po
ssi
ble au
ses
:
1. L
ean
fue l n
ix
tu
res.
2. Low oct
an
e fu
Is.
3.
Over-adv
anc
ed ig
ni
tion
timing.
4.
. n
gine
lugg
in
g.
5. Bu
il
d-
up of ca r
bon
de
pOS
it
s on pis
to
n and
cy l
lnde
r h
ead
ca
usi
ng xc
ess
i
ve
co mp
res
-
s ion.
5.
Wro
ng cy
li
nd
er
11
ad
or
m
ill
ing of h
ea
d
in
creas
in
p;
com pr
ess
ion
r
ati
o.
Lith
o in U.S.
A.