8-13
Carburetor Replacement
(Beginning Spec D)
Other than turning the altitude adjust knob shown in
Figure 8-10 (which changes the main fuel mixture
within a limited range), fuel mixture adjustments
should not be attempted. Nor should the carburetor
be overhauled. Instead, a malfunctioning carbure-
tor should be replaced. Before replacing a carbure-
tor, however, make certain that:
• All other necessary engine and generator ad-
justments and repairs have been performed.
• The carburetor is actually malfunctioning, by
carefully following the troubleshooting proce-
dures in Section
6. Troubleshooting
.
See the instructions on how to remove and replace
the carburetor under the subheadings
Air Filter and
Preheater Assembly
on Page 8-11 and
Carburetor
and Intake Manifold Assembly
on Page 8-12.
A throttle stop screw is provided for adjusting the
“closed” position of the throttle plate to obtain prop-
er governor response when loads are being discon-
nected. (See
Governor Adjustments
on Page 8-9)
To adjust the throttle stop screw:
1. Connect a frequency meter and start and run
the genset until it has warmed up to normal op-
erating temperature.
2. Disconnect all loads. Pull the governor linkage
toward the front of the genset so that the tang
on the throttle lever bears against the throttle
stop screw. Adjust the stop screw to obtain a
frequency of 54 to 56 Hz on 60 Hz gensets (44
to 46 Hz on 50 Hz gensets).
ALTITUDE
SCALE
THROTTLE
STOP SCREW
ALTITUDE
ADJUST
KNOB
THROTTLE
LEVER
TAMPER
RESISTANT
PLUG OVER
IDLE MIXTURE
NEEDLE
CHOKE
LEVER
FUEL
SHUTOFF
SOLENOID
(E3)
FIGURE 8-10. CARBURETOR ADJUSTMENTS
(BEGINNING SPEC D)
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