Electric Choke: A 12 volt electric choke (Figure 29)
with vacuum booster is used on all engines. The
adjustable choke cover is held in place by three
screws. Perimeter of the cover is divided into sections
by small raised marks. One mark is labeled zero and
the twelfth mark from zero is labeled with an asterisk
(*), which indicates normal adjustment setting. Along
raised line on top of the choke housing is used as the
reference mark. Normal setting for the choke is made
when the asterisk mark lines up with reference line.
If overchoking occurs, loosen three locking screws
and turn choke cover slightly to the left
(counterclockwise). Do not turn very far. One or two
notches will usually be sufficient. Tighten locking
screws. To increase choking action, turn choke cover
slightly to the right (clockwise). Retighten cover
screws.
LONG RAISED LINE
LOCKI
SCREWS (3)
FIGURE 29. ELECTRIC CHOKE
Anti-Dieseling Control: Normally factory adjustment
should not be changed. Adjustment procedure is
included with governor adjustment.
The anti-dieseling control is a device to hold the
throttle closed during engineshutdown. This ensures
prompt stopping and prevents backfiring. A spring
and linkage hold the throttle closed during shutdown.
A solenoid is energized to overcome spring tension
and permits the governor to open the throttle for
engine running.
Governor (Includes Anti-dieseling Control): The
governor controls the speed of the engine, and
therefore the frequency of the voltage. Engine speed
affects AC output voltage. Use either a tachometer or
frequency meter to check engine speed for proper
governor adjustment.
1.
Governor linkage—With engine stopped, throttle
held wide open, and tension on governor spring,
adjust the governor linkage length by rotating the
ball joint on the link so that the throttle stop lever
clears the stop pin by not less than
1/32".
2.
Anti-diesel control—Move override and no load
stops (set screws on wire link, Figure 32) away
from override lever so that they have no effect on
engine speed.
3. Warm up—Start the engine and allow it to reach
operating temperature.
4.
Speed—With no electrical load connected, adjust
the speed adjusting screw to obtain 1890
r/min
(63 hertz) for
a
60 hertz set or 1590
r/min
(53 hertz)
for a 50 hertz set. Apply a full electrical
load."
The
speed drop from the no load figure should be no
more than 90
r/min
(3 hertz) and no less than 45
r/min
(1-1/2 hertz). An incorrect speed drop frorr:
no load to full load necessitates a sensitivity
adjustment.
30
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