0322864 JOHNSON CYLINDER HEAD, Port, 140 HP

Table 1
Configuration Parameters for G3500B Engines
Parameter Oxygen Feedback Charge Density
Timing Control
"First Desired Timing" Yes Yes
"Second Desired Timing" Yes Yes
Air/Fuel Ratio Control
"Fuel Quality" Yes Yes
"Gas Specific Gravity" Yes Yes
"Desired Oxygen at Full Load" Yes No
"Oxygen Feedback Enable Status" Yes No
"Fuel Specific Heat Ratio" No Yes
"Desired Emission Gain Adjustment" No Yes
"Air/Fuel Proportional Gain" Yes Yes
"Air/Fuel Integral Gain" Yes Yes
Speed Control
"Low Idle Speed" Yes Yes
"Minimum High Idle Speed" Yes Yes
"Maximum High Idle Speed" Yes Yes
"Engine Accel. Rate" Yes Yes
"Desired Speed Input Configuration" Yes Yes
"Governor Type Setting" Yes Yes
"Engine Speed Droop" Yes Yes
"Governor Proportional Gain" Yes Yes
"Governor Integral Gain" Yes Yes
"Governor Derivative Gain" Yes Yes
"Auxiliary Proportional Governor Gain 1"(1) Yes Yes
"Auxiliary Integral Governor Gain 1"(1) Yes Yes
"Auxiliary Derivative Governor Gain 1"(1) Yes Yes
Start/Stop Control
"Driven Equipment Delay Time" Yes Yes
"Crank Terminate Speed" Yes Yes
"Engine Purge Cycle Time" Yes Yes
"Engine Cooldown Duration" Yes Yes
"Cycle Crank Time" Yes Yes
"Engine Overcrank Time" Yes Yes
"Engine Speed Drop Time" Yes Yes
"Engine Pre-lube Time Out Period" N/A
Monitoring and Protection
"High Inlet Air Temp Load Set Point" Yes Yes
Power Monitoring
"Generator Output Power Sensor Scale Factor"(1) Yes Yes
"Generator Output Power Sensor Offset"(1) Yes Yes
"Engine Output Power Configuration" No Yes
"Engine Driven Accessory Load Configuration" No Yes
Information for the ECM
"Engine Serial Number" Yes Yes
"Equipment ID" Yes Yes
"Customer Password #1" Yes Yes
"Customer Password #2" Yes Yes
"Total Tattletale" Yes Yes
(1) This parameter is not used for industrial arrangements.Timing Control
The "Desired Timing" parameters allow the customer to program the timing of the ignition spark for the engine. The desired timing value can be changed while the engine is running or while the engine is stopped. The value that is entered for the desired timing is the ignition timing when the engine is operating at rated speed and at full load.Note: The actual ignition timing at a given instance may vary from the desired timing value. This variance is due to variations in the engine speed or the detonation.The range for programming the desired timing is 0 to 40 degrees before the top center (TC) position."First Desired Timing"
The "First Desired Timing" is determined with the methane number of the primary fuel that is used. Use the Engine Performance Sheet, "Fuel Usage Guide". The ECM selects the "First Desired Timing" when terminal J1-20 is not connected to ground."Second Desired Timing"
The "Second Desired Timing" is determined with the methane number of the alternate fuel that is used and the Engine Performance Sheet, "Fuel Usage Guide". The ECM selects the "Second Desired Timing" when terminal J1-20 is connected to ground. If an alternate fuel is not used, enter the same timing that was entered in the "First Desired Timing".Air/Fuel Ratio Control
Before the initial start-up, a current gas analysis is required. Periodic gas analyses are also recommended. Data from the gas analysis must be entered into Caterpillar Software, LERW4485, "Gas Engine Rating Pro (GERP)". The results are programmed into the ECM.Note: Use the Caterpillar Software, LERW4485, "Gas Engine Rating Pro (GERP)" to calculate the values for the following parameters. Use of only the data from the gas analysis can result in incorrect settings."Fuel Quality"
This parameter defines the Low Heat Value (LHV) of the fuel. The air/fuel ratio control of the ECM will compensate for some inaccuracy in this setting. The ECM assumes a corrected value that is multiplied by the "Fuel Correction Factor". This factor can be displayed on the Cat ET screen.The "Fuel Quality" parameter can be used to change the air/fuel ratio when the engine is operating in the open loop mode. To richen the air/fuel mixture, reduce the value. The calculation will compensate for the reduced LHV by increasing the fuel flow. To lean the air/fuel mixture, increase the value. The calculation will compensate for the increased LHV by reducing the fuel flow."Gas Specific Gravity"
This parameter defines the specific gravity in relation to the specific gravity of air for the fuel. The ECM does not use this information. The ECM provides the information to the fuel metering valve via the CAN data link. Some fuel metering valves require an input for the "Gas