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20
Engine
Tractors,
Lawn
and
Garden
-
110
and
112
15-18
Piston,
Crankshaft
and
Flywheel
-
Kohler
SM-2059-(Apr-67)
SPECIFICATIONS
K161S K181S
Kohler
Engines
Component
New
Part
Dimension
Wear
Tolerance
Crankshaft
pin
size
1.186
inch
0.0025
inch
out
of
round
Replace
or
grind
crank
pin
Piston
pin
diameter
K161S-K181S
0.6247
/
0.6249
inch
Standard
Piston
diameter
top
of
skirt
(just
below
oil
ring
groove)
at
90°
to
piston
pin
bore
K161S
2.8675/2.8685
inch
2.8625
inch
K181S
2.929
/
2.930
inch
2.925
inch
Piston
pin
bore
0.625
/
0.627
inch
0.632
inch
Cylinder
bore
K161S
2.875
inch
2.880
or
0.004
inch
out
of
round
K181S
2.9375
inch
2.9425
or
0.004
inch
out
of
round
Ring
groove
side
clearance
0.002
/0.0035
inch
TABLE
OF
CLEARANCES
Item
Clearances
Crankshaft
end
clearance
0.002
/
0.023
inch
Connecting
rOd-large
end
0.001
/
0.002
inch
Connecting
rod-large
end
side
clearance
0.005
/
0.016
inch
Piston
skirt
clearance
at
thrust
face
Top
of
skirt
0.006
/
0.008
inch
Bottom
of
skirt
0.
003
/
0.006
inch
Piston
ring
end
gap
0.007
/
0.017
inch
TORQUES
FOR
HARDWARE
TUNE-UP
DATA
Item
Specification
s
Location
Torque
Connecting
rod
cap
220-200
in-Ibs
Crankcase
lubricant
Ref
er
to
Section
10
for
screws
See
page
15-16
proper
crankcase
lu-
bricant
Flywheel
nut
75
ft-Ibs
Oil
change
Every
25
hours
of
opera-
Misc
.
hardware
Refer
to
Torque
Chart,
tion
or
every
8
hours
Section
10
under
extremely
dusty
conditions
Engine
block
0.005
inch
wear
or
0.004
inch
out
of
round.
In-
stall
heavy-duty
rings
Litho
in
U.S.A.