824930T 2 Mercury BRACKET

Introduction
Do not perform any procedure in this Special Instruction until you have read the information and you understand the information.References
The following publications may be needed to perform some of the procedures in this Special Instruction
Systems Operation/Troubleshooting/Testing and Adjusting, KENR9788, "CG137-08 and CG137-12 Engines"
Systems Operation/Troubleshooting/Testing and Adjusting, KENR6870, "G3304B and G3306B Engines"Program the Parameters into the Engine Electronic Control Module (ECM)
Obtain a complete fuel analysis. Enter the data into Caterpillar Software Program, LEKQ6378, "Methane Number Program".Note: For information on connecting a personal computer to the service tool connector and on communicating with Caterpillar Electronic Technician (ET), refer to the engine Troubleshooting manual.
Connect a personal computer to the service tool connector. Establish communication between Cat ET and the engine ECM.
Use the "Configuration" screen from the "Service" pull-down menu on Cat ETto view the configuration parameters.Note: The configuration parameters can also be accessed with the Messinger display on the engine control panel. The factory default password is 0000.
View the parameters that are listed in Table 1. Program the parameters, if necessary.Incorrect programming of the parameters may lead to complaints about performance and/or to engine damage.For descriptions of the parameters and for more information, refer to the engine Systems Operation manual.
Table 1
ECM Identification Comments
"Equipment ID"
"Engine Serial Number"
Timing Control
"First Desired Timing" Determined with the methane number of the primary fuel that is used and with the Engine Performance Sheet, "Fuel Usage Guide"
Air/Fuel Ratio Control
"Emissions Feedback Mode Configuration" Set to "Oxygen Feedback"
"Aftertreatment #1 Outlet Oxygen Sensor Voltage Offset" Set to 0.0 V
"Emissions Feedback Disable Fuel Actuator Position Command" Set to 45%
Speed Control
"Low Idle Speed"
"Engine Acceleration Rate"
"Maximum Engine High Idle Speed"
"Minimum Engine High Idle Speed"
"Governor (Proportional) Gain Percentage"
"Governor (Integral) Stability Percentage"
Start/Stop Control
"Engine State Control Input Configuration"
"Starting System #1 Type"
"Crank Terminate RPM"
"Engine Purge Cycle Time"
"Cycle Crank Time"
"Crank Duration"
"Driven Equipment Delay Time"
"Engine Speed Drop Time"
"Cooldown Duration" Determine the Fuel Supply Pressure
Adjust the fuel supply pressure to the engine gas pressure regulator.
For low-pressure fuel systems, the recommended pressure is 10.3 to 34.5 kPa (1.50 to 5.00 psi).
For high-pressure fuel systems, the recommended pressure is 82.7 to 172.4 kPa (12.00 to 25.00 psi).For high-pressure fuel systems, the fuel supply pressure to the engine gas pressure regulator can also be calculated.Calculating the Fuel Supply Pressure to the Gas Pressure Regulator
Table 2
Equation for Fuel Supply Pressure to the Gas Pressure Regulator
[(Adjusted boost pressure - corrected atmospheric pressure) × 0.4912] + NES The variables must be determined before using the equation in Table 3.
Table 3
Calculations and Variables Needed for Determining Fuel Supply Pressure to the Gas Pressure Regulator
(Fuel Consumption in BTU/HP-H × Rated Horsepower (HP)) ÷ Fuel Low Heat Value (LHV) in BTU/SCF =
Standard Cubic Feet per Hour of Fuel for Full Load Operation
Net Effective Supply (NES) Pressure of the Gas Pressure Regulator in PSI
Adjusted Boost Pressure NA engines
and
TA low gas pressure engines The adjusted boost pressure is the full load carburetor air inlet pressure in inches of Hg at the site altitude. The value is also called inlet air restriction pressure.
TA high gas pressure engines The adjusted boost pressure is the full load turbocharger compressor outlet pressure in inches of Hg at the site plus 5% of that value.
Corrected Site Atmospheric Pressure Standard barometric pressure (29.92 in Hg) minus the site altitude in feet times 0.001
29.92 in Hg - (altitude × 0.001)
Locating the Information for the Calculation
Variable Source
Fuel Consumption in BTU/HP-H Engine Performance Data Sheet
Technical Marketing Information (TMI)
Gas Engine Ratings Pro (GERP)
HP Engine Performance Data Sheet
TMI
GERP
LHV GERP
Fuel analysis
Carburetor Air Inlet Pressure (NA or TA low-pressure engines only) Full load inlet air restriction
Assume the local absolute atmospheric pressure in inches of Hg.
Boost Pressure (TA high gas pressure engines only) Engine Performance Data Sheet
TMI
Altitude of the site Local elevation in feet
NES Illustration 1
Illustration 1 g02800036
Gas supply pressure for the 2W-6022 Pressure Regulator for G3304B and G3306B Engines
(X) Net effective supply pressure (NES) in psi
(Y) Regulator flow capacity in standard cubic feet per hour (SCF/HR)Example of Calculating the Required Fuel Pressure to the Gas Pressure Regulator
This example uses a G3306B TA engine.
Table 4
Information for the Calculations
Variable Value
Fuel consumption 8066 BTU/HP-H
HP 205