Fuel System Recalibration - Kohler COM7.5 Service Manual

Fuel Conversion Procedure
1. Move the remote start/stop switch to the STOP
position.
2. Follow the enclosure manufacturer's instructions
to open the enclosure to gain access to the fuel
system.
3. Verify that the generator set master switch is in the
STOP position.
4. Disconnect power to the battery charger, if
equipped.
5. Disconnect the battery, negative (--) lead first.
6. Turn off the fuel supply.
7. Remove the hose clamp and fuel line hose from the
fitting in the fuel block.
8. Remove the hose fitting from the natural gas (or
LP) outlet in the fuel block.
9. Remove the plug from the LP (or natural gas) inlet.
Clean the plug with a dry cloth or brush, apply fresh
pipe sealant, and install the plug into the natural
gas (or LP) outlet.
10. Clean the hose fitting with a dry cloth or brush,
apply fresh pipe sealant, and install the fitting into
the LP (or natural gas) inlet.
11. Slide the hose onto the hose fitting and secure the
hose with the clamp.
12. Turn on the fuel supply and check for leaks using a
gas leak detector.
13. Reconnect the battery cable and harness.
14. Follow the enclosure manufacturer's instructions
to close the enclosure.
4.5.4

Fuel System Recalibration

The fuel metering valves are factory-set to meet
emissions requirements and sealed to discourage field
adjustments. If the fuel system requires recalibration,
only trained, authorized service technicians may adjust
the fuel metering valves. Always use an oxygen sensor,
available from Kohler Co., when adjusting the fuel
metering valves. See Maintenance and Service Parts in
this manual for the sensor part number.
Note: Changing the fuel system adjustments may void
the emissions certification.
28 Section 4 Component Testing and Adjustment
WARNING
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.
Fuel System Recalibration Procedure
1. Remove the plug from the oxygen sensor port in
the exhaust tube and install the oxygen sensor.
See Figure 4-8.
2. Run the generator set at full load and check the
oxygen sensor reading. At full load, the oxygen
sensor output voltage should be between 0.45 and
0.55 VDC.
3. If adjustment is required, remove the seal on the
fuel metering valve and adjust the valve to obtain
an oxygen sensor reading between 0.45 and
0.55 VDC. See Figure 4-6 for the fuel metering
valve location.
4. Reseal the valve after adjustment.
5. Allow the exhaust system to cool. Remove the
oxygen sensor from the exhaust tube and reinstall
the plug.
1. Oxygen sensor port
Figure 4-8 Oxygen Sensor Port Location
Hot parts can cause
1
photos4--6
TP-6120 5/02