HEAD 5J2538 - Caterpillar

Fuel Pressure
Check the fuel supply pressure to the gas pressure regulator. If the pressure is not 20 to 40 psi, make the correction to engine fuel supply.Inlet Manifold Pressure
The inlet manifold pressure is measured below the throttle plate with a pressure gauge. The inlet manifold pressure is used to indicate the engine load.Initial Start-Up Procedure
Ensure that all these factors are in proper working condition prior to the initial start-up: engine installation, driven equipment, all the related hardware, and electrical connections. Failure to perform the commissioning procedure could result in unsatisfactory operation.Perform the following procedure for the initial start-up and for start-up after major maintenance and/or after repair.Initial Air Fuel Ratio Setup
This procedure is primarily used for initial setup the first time the engine is started up on site to give the best performance results. If the engine becomes unstable or hard to start later, perform this initial procedure again. This procedure is not routine and not performed often.Changes to the fuel and emissions gain adjustment can be performed during normal engine operation. This procedure is included in the emissions gain adjustment procedure.
Connect Cat ET.
Start the engine, allow proper engine warm up, and begin engine loading. Verify that there are no active codes.Note: The engine must be running at the least 1200 rpm and at the least 50% load.
Do not adjust the "Fuel Quality" parameter when the engine is in emissions feedback or closed loop mode to obtain an FCF of 100.
Adjustment to the wastegate must be made while the engine is under maximum available load and speed. Adjust the wastegate to obtain a "Throttle Differential Pressure" of 5 to 10 kPa.
The initial air fuel ratio setup is complete.Setting the Air/Fuel Ratio (AFR) Control
Before setting the AFR control, complete the following.
Verify the installation of the catalyst inlet/outlet thermocouples, NOx sensor, and the O2 sensor.
Both the pre-catalyst and post-catalyst catalyst thermocouples must be installed within 30.5 cm (12 inch) of the catalyst and at least 6.4 cm (2.5 inch) into the exhaust stream. Both thermocouples must be installed about 90 degrees down the side of the exhaust pipe from the top line of the exhaust pipe. Do not install the sensors in the bottom of the pipe.
The pre-catalyst O2 sensor must be installed within 30.5 cm (12 inch) of the catalyst. The pre-catalyst O2 sensor must be mounted about 33 degrees down the side of the exhaust pipe from the top line of the exhaust pipe.
The posts-catalyst NOx sensor must be installed within 30.5 cm (12 inch) of the catalyst. The posts-catalyst NOx sensor must be mounted about 33 degrees down the side of the exhaust pipe from the top line of the exhaust pipe.
Follow the Application and Installation Guidelines for insulation instruction for the exhaust pipe to the catalyst.Note: Do not insulate the catalyst.Note: Do not insulate either, the pre-catalyst O2 sensor or the posts-catalyst NOx sensor.
Since stoichiometric varies with fuel property, the AFR control needs set to deliver the optimum AFR for the fuel quality at the site.