8-24
Fuel-Shutoff Solenoid Valve
Leak Test:
See Figure 8-20.
If there is a smell of
gas when the genset is not running, or any other
reason to suspect that the valve is leaking, connect
the inlet of the valve to a source of air pressure regu-
lated to not more than 14 inches WC (356 mm WC)
and disconnect the outlet hose. Replace the sole-
noid if it leaks, as checked by a soap bubble.
Operation Test:
If the genset cranks, but does not
start (first see Section
6.
Troubleshooting
), deter-
mine whether or not the valve is opening. With the
source of air still connected, energize the valve by
connecting battery positive (+) to the top terminal
and battery negative (–) to the grounded terminal.
Replace the solenoid valve if it does not open when
it is energized.
LPG Carburetor (Beginning Spec E)
See Figure 8-21. An LPG carburetor is not likely to
cause problems and should be replaced only after
all other causes have been eliminated (see Section
6. Troubleshooting
). It is not necessary to adjust
fuel mixture. These carburetors are calibrated at the
factory and the adjustments are sealed.
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 44 to 46 Hz on 60 Hz gensets (36
to 38 Hz on 50 Hz gensets).
FIGURE 8-20. FUEL SOLENOID VALVE
GAS HOSE
FITTING
THROTTLE
STOP SCREW
THROTTLE
LEVER
FIGURE 8-21. LPG CARBURETOR
(BEGINNING SPEC E)
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