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20
En~ine
Tractors
, L
aw
n
and
Ga r
de
n -
110
and
112
15-6
Piston,
Cr
a
nk
s
haft
an
d
Flywhee
l - Ko
hler
PISTON
HING
ANALYSIS
-
Co
ntin
ued
H
.'"
Fi
g.
12-Cl
eol1ing
Ring
Grooy
",
SM
-2059-
(Apr
- 57)
" , . ' j
F
iy.
) I-
Wor
n O
il
Ring
s
Wh
ich
Can"o'
P,oy
/de
Oil
C
o",rol
Ha
ils
of
theoilringarew
o
rndownto
the
steel
e
xp
a
nd
er
spac
e r
an
d
th
e
oil
ring
s
urfac
e
is
worn
flat.
This
can
only
come
from
cy
linder
wall
contact
after
much
use
and
possH)
le
entry
of
abrasives
.
Comp
r e
ssion
rin
gs
will
also
be
worn
thin.
Badly
worn
o
il
rinRs
wi
ll
hav
e:
1.
Extra
lar
ge
g:a
p.
2. Low
tensi
on.
INSPECTING
PISTON
R
emuve
deposits
[rom
piston
surf
a
ces.
Cl
ean
h'l
Jrl1
a
nci
varnish
[rom
th
e
piston
skirt.
Do
not
use
a
caustic
cleaning
sol
ution
or
a
wire
brush
to
clean
pistons.
Be
s
ur
e
the
o
il
rin
g-
hok
::;
arc
c
ll
·
an
.
Clean
carbo
n
fr
ol11
pist
on
ring
grnoves
with
a
ring. g r
oove
cleaner.
If
c le3.ning t
oo
l
isnotavail-
abl
e . lw
ea
k
an
old ring: ancl u
s'"
it to
C1e3.11
!:';roove.
Fihrure 12.
F
ig.
13-Moasuli,,
'l
R
ing
CI
<>ol
on
e
<>
Check
rin
g gr
ooves
for
xc
ss
ive
wear
by
inserting-
a n
ew
rin
g in
th
e p
re
per
graD
e at
s 've n
ll
pOint a r o
und
th
e
piston
. M
ea
su
r c l
ea
r-
3.
Il
CC
be
tween
rin
g
and
f
!TO
OV
with
a f e1ot'
g
au
gl:>,
Figure
13 .
Ref
er to
'pec
if
iea
t
io
ns
,
p
a~e
15- 18.
[or
rin
g gr
oove
side
cl
ea
ranc
. n
eplac
e
pisto
n havi.llg-
rin
g
cl
earan
ce
beyo
nd
we r
li
mits.
In
spec
t
piston
f
or
[ra
c
tu
es
at
the
ri.ng
lan
d
s,
s
kirts
and
ring
bosse
s
and
for r ough
or
score
d
sl<irts.
Anal
yz
e
the
condition
o[
th
e
pi
s
to
n
by
s
tu
cly in g
th
e
ill
us
tr
at
i
on
s 1 e
f.",'
in
nin
g;
on p
age
15-7
.
:8
epl
ac
e
faulty
pi
stons.
Litho
in
U.
S.A.