DISC 6E4098 - Caterpillar

For engines with an adjustable exhaust bypass valve, remove the cap (8) and loosen the locknut (9). Turn the adjustment screw (10) in order to obtain a throttle angle of 60° to 70° at full load. It may be necessary to readjust the carburetor adjusting screw and the exhaust bypass valve several times. This adjustment is made in order to obtain the correct angle of the throttle at full load. This adjustment is also made in order to obtain the correct exhaust oxygen level.Note: The angle of the throttle can not be observed on engines that are equipped with a Flo-Tech actuator. Adjust the exhaust bypass valve until a signal voltage of 4.0 VDC is generated between the terminals "E" and "B" at full load. Refer to the ""Flo-Tech Actuator Position"" for details.
Operate the engine throughout the expected load range. Verify that the engine rpm is stable. Verify that the angle of the throttle and the exhaust oxygen level at full load is correct. If the engine rpm is unstable, verify that the gas line pressures at no load and at full load are within acceptable limits. The pressure must not vary more than 1.7 kPa (0.25 psi) for low pressure fuel systems. The pressure must not vary more than 6.9 kPa (1 psi) for high pressure fuel systems. If the gas line pressure is within acceptable limits, it may be necessary to adjust the governor settings. Refer to the Governor Service Manual for details.
Check the final adjustments to the engine in order to ensure compliance with the emissions requirement. Use a NOx meter or a CO meter, or use both of these meters together in order to perform this check. In order to obtain desired emission levels, it may be necessary to make slight adjustments to the following settings:
the carburetor adjusting screw
the differential pressure
the setting of the exhaust bypass valve These adjustments are particularly important for low emissions engines and for engines that are equipped with a catalyst.Adjustment Procedure For Deltec Mixer And Zero Pressure Regulators
Note: Gas can leak through the zero pressure regulator into the fuel system when the gas shutoff valve is open. Do not leave the gas shutoff valve open for a longer time than the time necessary to make adjustments. Before starting the engine, purge the inlet system and the exhaust system by disabling the ignition system. Then crank the engine with the gas supply OFF for three to five seconds.
Ensure that the throttle linkage is adjusted correctly. Refer to the Service Manual, "Systems Operation Testing And Adjusting Section".
Set the pressure from the gas supply line to the zero pressure regulator at 3 kPa (0.45 psi) to 7 kPa (0.95 psi).
Remove the cover (12) and the cap (15) from the zero pressure regulator.
Open the gas shutoff valve in order to supply gas to the zero pressure regulator.
If gas flows out of the valve (11), turn the screw (14) counterclockwise until the flow stops.
Turn the screw (14) clockwise in order to begin to lift