Fuel Metering Valve Adjustment - Kohler 6VSG Service Manual

12. Reconnect the generator set engine starting
battery leads, negative (–) lead last.
13. Reconnect power to the generator set.
14. Start the generator set by pressing the RUN
button on the generator set controller.
15. Check for leaks using a gas leak detector.
16. Press the OFF button to shut down the generator
set.
17. The Fuel Type parameter can be set at the
controller in the Genset System menu. SiteTech
is not required. Setting this parameter is optional;
it does not affect the operation of the generator
set.
To convert from LPG to natural gas, follow the same
fuel conversion procedure, moving the hose fitting to
the natural gas port and plugging the LPG port.
5.8.4

Fuel Metering Valve Adjustment

The fuel system is factory-adjusted to comply with
applicable emission standards and to provide the best
possible hot and cold starting.
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.
Figure 5-26 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.
TP-6844 1/13
The fuel metering
See
Figure 5-27
!
Hot engine and exhaust system.
Can cause severe injury or death.
Do not work on the generator set
until it cools.
Servicing the exhaust system.
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 controller.
3. Disconnect power to the generator set.
4. Remove the oxygen sensor plug from the silencer
and install the oxygen sensor. See Figure 5-27
for location.
1
1. Oxygen sensor mounting location
Figure 5-27 Oxygen Sensor Mounting Location
Section 5 Component Testing and Adjustment
WARNING
Hot parts can cause
KPS_132
GM80219
81