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Top Products
20
Engine
Tractors,
Lawn
and
Garden
- 110
and
112
20-2
Camshaft,
Tappets
and
Governor-Kohler
SM-2059-(Apr-67)
SPARK
ADVANCE
CAMSHAFT
T
[i'
t . j
~
f
·1
,\~
,
M
INI
Fig
.
2-Spark
AdvancQ
Camshaft
The
K161
En
g
ine
used
in 110
Tr
ac
tors
-3550)
and
K181
Engine
used
in
Tra
c
tors
3551-40000)
have
spark
advance
camshaft,
Figure
2.
Weights
on
the
camshaft
gear
actuate
the
breaker
point
cam,
which
in
turn
retards
th
e
ignition
timing
during
the
cranking
cycle.
As
engine
reaches
500-600
rpm,
timing
is
advanced
and
engine
operates
in
the
standard
manner
at
all
higher
speeds.
AUTOMATIC
COMPRESSION
RELEASE
CAMSHAFT
"
~tJl1
Fig.
3-Au/omatic
Compre
ss
i
on
Release
Camshaft
(ACR)
K181
Engines
in 110
Tra
c
tors
(40001-100,000)
ha
ve
the
automatic
compression
release
cam-
shaft,
Figure
3.
The
ACR
c
amshaft
can
be
installed
in
engines
on
110
Tractors
(
-40000).
The
necessary
parts
are
provid
ed in
kit
form.
After
installa-
tion,
check
valve
clearan
ce,
pa
ge
10-11
.
All
short
blocks
are
equipped
withACR
cam-
shafts.
Fi
g.
4-ACR
Opera/ion
Automatic
c
ompression
release
provides
a
reduction
in
cranking
effort
by
holding
the
ox
-
haust
valve
open
slightly
during
the
first
part
of
the
compression
stroke.
This
allows
part
of
tile
fuel-air
mixture
to
es
cape,
lowering
the
Co
m-
pression
pressure,
Figclre
4.
This
fe
a
ture
is
especially
valuable
during
cold
we
a
ther
starting
.
By
releasing
compression,
the
pressure
of
the
burning
mixture
is
reduced
sufficiently
for
the
flywheel
to
carry
the
engine
over
top
dead
center.
This
prevents
"ki
c
k-back"
and
eliminates
th
e
need
for
the
spark
retard
mechanism.
When
the
engine
speed
reaches
approximately
650
rpm,
centrifugal
force
disengages
the
ACR
allowing
the
engine
to
operate
in
the
usual
man-
ner
at
all
higher
speeds,
with
no
loss
of
po
we
r.
Litho
in
U.S.A.