TP-5867 11/02 55Section 6 Component Testing and Adjustment
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.
Fuel Metering Valve Adjustment Procedure
1. Place the generator set master switch in the OFF
position.
2. Disconnect power to the battery charger, if
equipped.
3. Disconnect the generator set engine starting
battery, negative (--) lead first.
4. Remove the oxygen sensor plug from the exhaust
manifold. See Figure 6-29 for location.
5. Install the oxygen sensor in the exhaust manifold
where the plug was removed.
6. Check that the generator set master switch is in the
OFF position.
7. Reconnect the generator set engine starting
battery, negative (--) lead last.
8. Place the controller master switch in the RUN
position to start the generator set.
9. Allow the generator set to run until the engine
reaches normal operating temperature.
10. With the generator set at normal operating
temperature, apply 90–100% of rated load.
11. Connect one of the DVM leads to the oxygen
sensor lead. Connect the other DVM lead to
ground and measure the output voltage of the
oxygen sensor (potential to ground).
The output of the oxygen sensor reads high when
the mixture is rich and close to zero volts when the
mixture is lean.
12. Adjust the fuel metering valve as required to obtain
an average of 0.50.3 VDC output from the
oxygen sensor. See Figure 6-29.
13. Remove the load and allow the generator set to run
unloaded to cool for at least 5–10 minutes.
14. Place the generator set master switch in the OFF
position.
15. Disconnect the generator set engine starting
battery, negative (--) lead first.
16. Allow the generator set exhaust system to cool.
1
A-358000A-J
4
23
1. Oxygen sensor plug
2. Fuel metering valve
3. Fuel metering valve adjustment screw
4. Oxygen sensor (Kohler part number A-345052)
Figure 6-29 Fuel Metering Valve Adjustment Components, Single-Fuel Models Only
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