0333008 JOHNSON GASKET, Air silencer

Introduction
Do not perform any of the following procedures without reading and understanding the information first.The Air/Fuel Ratio setup instructions that follow are intended to maintain emissions for fuel with a Lower Heating Value (LHV) of 800 to 1600 BTU/ft3. The engine control strategy is not designed to run on any fuels outside of this range. Maintenance of emissions is not guaranteed on engines that are run on fuels outside of this range. Caterpillar® also recommends adjusting the Air/Fuel Ratio when the gas pressure regulator is serviced or inspected.Set the Natural Gas/Field Gas Fuel Supply Pressure
Calculate the required fuel supply pressure based on the site conditions using the formula below.Fuel Supply Pressure (FSP, psig) = (46 - 29.92 - (altitude [feet] x .001)) x .4912 + 5Note: The altitude in feet is a required input from the customer.This calculation should result in a recommended gage pressure of 82.7 to 172.4 kPag (12 to 25 psig). Set the gas supply pressure of the engine to this value.Determining the Ignition Timing
The timing parameters allow the customer to program the ignition timing of the engine to meet the needs for specific applications and installations.Note: The actual ignition timing at a given operating condition may vary from the desired timing value. The timing follows a trend of a timing map that is based on engine speed, load, and user input timing in the Electronic Control Module (ECM).First Desired Timing
The "First Desired Timing" is determined with the methane number of the primary fuel that is being used. Obtain the timing information for the specific fuel and site conditions from the local Caterpillar dealer. The timing can also be obtained using the Caterpillar® Gas Engine Rating Pro (GERP) software program.Note: If the fuel composition at a given site changes greater than five methane points, the timing will need to be reset. Contact the local dealer or use GERP if such a change occurs.A free copy of GERP can be obtained by going to the following link and searching GERP in the search field. More information regarding the GERP program can also be obtained from the website.https://catoilandgas.cat.comGERP can provide the maximum rating capability for conditions at a given site. Use the following procedure to use GERP.
Select the "Engine Selection" tab on the left side of the screen.
Under the "Application" option, select "Electric Power".
Select the desired engine by selecting the appropriate options from under the "Engine Model" option, and select "G3306B".
Select "NEXT" using the radio button at the bottom.
Select the "Fuel Analysis" option and input the fuel composition obtained for the specific site.
Record the site "Set Point Timing" value found in the "Results" box on the "Project" screen.Perform the following setup procedures, depending on the configuration of the engine :
Engines equipped with a single fuel system using the natural gas pressure regulator - Part A
Engines equipped with a dual fuel regulator (natural gas and propane) arrangement - Part A and Part BSetting the Ignition Timing
Use the following procedure to set the timing value found in the "Determining Ignition Timing" section using the engine display panel.
Select "Main Menu".
Select "Configure".
Select "All Set Points".
Select "Engine Configuration Parameters".
Select "Timing Control".
Select "First Desired Timing".
Select and change the "First Desired Timing".Perform the following setup procedures depending on the configuration of the engine :
Air/Fuel Ratio Setup for Natural Gas/Field Gas - Part A
Air/Fuel Ratio Setup for Propane - Part B
Set up for Automatic Switching Between Natural Gas/Field Gas and Propane - Part CAir/Fuel Ratio Setup for Natural Gas/Field Gas - Part A
Calculate the Engine Pressure Regulator Differential (dP)
Illustration 1 g03605058
Set the engine gas pressure regulator output gas to air pressure differential according to the gas energy content found in Illustration 1.Adjusting the Engine
Setting the Engine Natural Gas Pressure Regulator (dP)
Turn the gas supply to the natural gas pressure regulator off.
Illustration 2 g03605338
(1) Low-pressure side port (2) High-pressure side port
Connect 1U-5470 Engine Pressure Gp or 198-4240 Digital Pressure Indicator Gp to the engine.
Connect the "High Pressure Side" of the gauge to the outlet port (2) of the engine regulator upstream of the electronic fuel control valve.
Connect the "Low Pressure Side" of the gauge to the tee fitting (1) of the balance line on the regulator as shown in Illustration 2.
Install the 8T-5160 Gas Regulator Setting Tool , if necessary.
Turn the gas supply pressure back on. Start the engine and operate at rated speed and no load.
Note the pressure differential on the pressure gauge. Compare the measured value to the value obtained previously in the Special Instructions, "Calculate the Engine Pressure Regulator Differential (dP)" section.
If the values match, proceed to Step 9.
If the values are different while using the 8T-5160 Gas Regulator Setting Tool , proceed to Step 6.
If the values are different and the 8T-5160 Gas Regulator Setting Tool is not being utilized, proceed to Step 7.
Use the 8T-5160 Gas Regulator Setting Tool to adjust the regulator spring pre-tension until the measured and calculated differential pressure match. Proceed to Step 9 after the values match each other.
Shut down the engine and turn off the gas supply pressure.
Remove the cap from the engine mounted gas pressure regulator.
Adjust the regulator by adjusting the nut and/or screw with a screwdriver or similar tool.
Replace the cap.
Turn on the gas supply pressure. Start the engine and operate at rated speed with no load.
Compare the differential pressure reading with the calculated differential pressure.
If the values match, proceed to Step 9. If the values do not match, repeat Step 7 to Step 8.ReferenceRefer to Testing and Adjusting, KENR6870, "Gas Pressure - Check and Adjust" for more information on adjust the regulator.
Replace the cap.
Stop the engine. Turn the gas supply to the regulator off.
Remove the lines for the differential pressure gauge and install the plugs back into the high and low side pressure locations.
Turn on the gas supply pressure and restart the engine.Setting the Air/Fuel Ratio Control
Adjusting the air/fuel ratio properly ensures compliance with emissions requirements and stable engine operation.The "Aftertreatment #1 Outlet Oxygen Sensor Voltage Offset" parameter directly offsets the voltage of the map for the "Desired Aftertreatment #1 Outlet