GOVERNOR
SYSTEM
GOVERNOR
ADJUSTMENT
Where engine speed
is
governor controlled,
the
governor
is set at the
factory
to
allow
a
nominal
engine speed
of
2400 rpm
at
no load operation (unless
another speed
is
specified when
the
engine
is
ordered).
Proper governor adjustment
is one of the
most important factors
in
maintaining
the
power
and
speed desired from
the
engine.
Before making governor adjustment,
run the
engine
about
15
minutes
to
reach normal operating
temperature.
It
is
difficult
to
determine
if,
after long usage,
the
governor spring has become fatigued. If, after proper-
ly making
all
other adjustments,
the
regulation
is
still
erratic, install
a new
spring (Figure
20 and 21).
A tachometer
for
checking engine speed
is
required
for accurate governor adjustment.
Check
the
governor arm, linkage, throttle shaft
and
lever
for
binding
or
excessive wear
at
connecting
points.
A
binding condition
at any
pointwill cause the
governor
to act
slowly
and
regulation will
be
poor.
Excessive looseness will cause
a
hunting condition
and regulation will
be
erratic. Work
the
arm back
and
forth several times
by
hand while
the
engine idles.
If
either
of
these conditions exist, determine
the
cause
and adjust
or
replace parts
as
needed.
THIS
DISTANCE
DETERMINES
SENSITIVITY
Procedure:
1.
Adjust
the
carburetor main
jet for the
best fuel
mixture
at
full load operation.
2.
Adjust
the
carburetor idle needle with
no
load
connected.
3. Adjust
the
length
of
.the governor linkage.
4.
Check
the
governor linkage and throttle shaft
for
binding
or
excessive looseness.
5. Adjust
the
governor spring tension
for
nominal
engine speed
at no
load operation.
6. Check
the
rpm drop between
no
load and full load
operation
and
adjust
the
governor sensitivity
as
needed.
7. Recheck
the
speed adjustment.
8.
Set the
carburetor throttje stop screw.
Linkage:
The
engine starts
at
wide open throttle.
The
length
of the
linkage connecting the governor arm
to
the throttle
arm is
adjusted
by
rotating
the
ball joint
housing.
Adjust
the
length
so
that with
the
engine
stopped and tension
on
the governor spring, the stop
on
the
carburetor throttle lever
is
1/32-inch
from
the
carburetor stop boss. This setting allows immediate
control
by the
governor after starting
and
syn-
chronizes travel
of the
governor arm
and the
throttle
shaft.
Speed Adjustment:
The
speed
at
which
the
engine
operates
is
determined
by the
tension applied
to the
governor spring. Increasing spring tension increases
THROTTLE
ARM-
CARBURETOR
THROTTLE
PLATE-
BALL
JOINT
GOVERNOR
ARM
SPRING
ADJUSTING STUD
•GOVERNOR ADJUSTMENT
FIGURE
20.
GOVERNOR ADJUSTMENTS
22
To Next Page
Loading...
