ADJUSTMENTS
,f'\.
CHECK
CENTRIFUGAL
BREAKER
POINTS
Refer
to
Dimensions and Clearances
for
correct gap dis-
tances. Replace burne4
or
faulty points.
If
only slightly burned, dress smooth with file
or
fine stone.
Measure gap
with
thickness gauge (Figure 16).
The centrifugal switch
is
wide
open
when
engine
is
stopped.
Loosen and
move
stationary contact to correct gap.
HOTE:
Rotate engine crankshaft a
few
degrees
counter-
clockwise before adiusting points.
To
release
any
torsional
forces created
by the water
pump
impeller. Use
aoocket
wrench
on
the flywheel retaining screw.
GOVERNOR
The governor controls engine speed. Rated speed
and
volt-
age appear
on
the nameplate (see
also
Specifications).
Engine speed equals frequency multiplied
by
30
on
a 4 pole
generator, thus 1800rpm
is
60
hertz. , The speed should
not vary
more
than 3 hertz
from
no
load to full-load oper-
ation. Be sure throttle, linkage
and
governor mechanism
operate smoothly •
.0
SiJeed
Adjustment: To change the governor speed, change
the s pring tension
by
turning the governor spring
nut
(Figure
18).
Turn
the nut clockwise
(more
spring tension)
to
increase
RPM
and counterclockwise to reduce governed speed.
Hold
a tachometer against flywheel cap screw
or
use frequency
meter.
Sens itivity
Adju
stment: To adjust governor sensitivity
(no-load to full-load speed .droop),
turn
the sensitivity ad-
justing ratchet (Figure 18), Connterclockwise gives
more
sensitivity (less speed drop
when
full load
is
applied),
clockwise gives
less
sensitivity
(more
speed drop).
If
the.
CE.NTRI
FUGAL
SWITCH
BREAKERPOlNTS
SET GAP
AT
.040",
FIGURE
16.
CENTRtFUGAl
SWITCH,
21
governor
is
too sensitive, a rapid hunting condition occurs
(alternate increasing and decreasing speed). Adjust
for
maximum
sensitivity without hunting. After sensitivity ad-
justment, the speed will require readjustment.· After adjust-
ing the governor, secure lock nut.
IMPORTANT:
Excessive
droop
may
be caused by engine
misfiring. Correct this condition before adjusting governor.
VALVE
CLEARANCE
Check valve clearance
when
the engine
is
at
room
tempera.
ture (about
70°F).
1.
Turn the flywheel until the cylinder which
is
to have
its valve adjusted
is
on
its
compression stroke. Use a
socket wrench
on
the flywheel screw hex head.
To determine
if
the cylinder is
in
its
compression
stroke, observe the action
of
the push rods
as
the
engine
is
rotated in a clockwise direction. The exhaust
valve push
rod
will be in
its
lowest position
and
the
intake valve push rod
will be
moving
I,lownward.
As
the
piston reaches top dead center,
the
flywheel timing
mark
should
be
aligned with the timin g pointer.
and
the
valve push rods stationary.
~-f"""";r-~
MAXIMUM. STOP
FIGURE
17.SE.TTINGST.OPSCREW
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