TP-6735 7/17 83Section 5 Component Testing and Adjustment
5.11.6 Fuel Metering Valve Adjustment,
14RES/RESL Only
The fuel system is factory-adjusted to comply with
applicable emission standards and to provide the best
possible hot and cold starting. The fuel metering valves
are sealed to prevent field adjustments. If the fuel
metering valve requires adjustment, do not break the
seals on the factory-installed fuel metering valve.
Obtain a new fuel metering valve to replace the
factory-installed valve, and adjust the fuel mixture
according to the instructions in this section. See
Figure 5-32 for the fuel metering valve location. Refer to
the generator set Parts Catalog for the fuel metering
valve part number.
Note: Adjusting the factory-installed fuel metering
valves on emissions-certified generator sets will
void the emission certification.
Use an exhaust gas oxygen sensor to check the fuel
mixture after replacing the fuel regulator, carburetor, or
silencer. Use the following procedure to check the fuel
mixture after the engine has reached normal operating
temperature.
Only trained, authorized service technicians may adjust
the new fuel metering valve. The adjustment procedure
requires a digital voltmeter (DVM), oxygen sensor
service kit GM58035, and a load bank capable of the
rated kW for the fuel being used. Always use an oxygen
sensor when adjusting the fuel metering valves.
Observe the following safety precautions while
performing the procedure.
Hot engine and exhaust system.
Can cause severe injury or death.
Do not work on the generator set until
it cools.
WARNING
Servicing the exhaust system. Hot parts can cause
severe injury or death. Do not touch hot engine parts. The
engine and exhaust system components become extremely
hot during operation.
Note: The oxygen sensor gets very hot during
operation. DO NOT touch the oxygen sensor,
during or after operation, until cool.
Fuel Mixture Check/Fuel Metering Valve
Adjustment Procedure
1. Follow the instructions provided with the oxygen
sensor kit to perform the initial programming and
setup of the air/fuel (A/F) reader. See SB-675,
provided with the oxygen sensor kit.
2. Press the OFF button on the RDC/DC controller.
3. Disconnect power to the battery charger.
4. Remove the oxygen sensor plug from the exhaust
manifold and install the oxygen sensor. See
Figure 5-34 for location.
1
GM74908
1. Oxygen sensor mounting location
Figure 5-34 Oxygen Sensor Mounting Location on
the 14RES/RESL
5. Follow the instructions provided with the oxygen
sensor kit to connect the oxygen sensor to the
power supply and A/F reader.
6. Reconnect power to the battery charger.
7. Press the RUN button on the controller to start the
generator set.
8. Allow the generator set to run until the engine
reaches normal operating temperature.
9. With the generator set at normal operating
temperature, apply rated load.
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