GEAR 7N6290 - Caterpillar

System Operation Description:The EIS control module has the ability to calibrate the mechanical differences between the Top Center (TC) of the flywheel and the TC of the timing gear on the left rear camshaft gear. A magnetic transducer signals the TC of the flywheel to the control module when the TC hole on the flywheel passes beneath the transducer. The engine speed/timing sensor signals the TC of the timing gear to the control module. Any offset between the TC of the flywheel and the TC of the timing gear is stored into memory.Calibration of the timing is required only after the following circumstances:
The EIS control module has been replaced.
The timing gear and/or the rear gear train have been adjusted.
The timing gear and/or the rear gear train have been replaced.The calibration procedure is initiated with an electronic service tool. Either the Digital Diagnostic Tool (DDT) or the Caterpillar Electronic Technician (ET) may be used to perform the calibration.Test Step 1. Install the Transducer and the Harnesses
Set the engine control to the OFF mode.
Remove the electrical power from the engine.
Remove the timing calibration plug from the right side of the flywheel housing. Install the 6V-3093 Transducer Adapter into the hole.
The timing hole in the flywheel must not be aligned with the hole for the transducer. The transducer will be damaged on engine start-up if the transducer is installed through both holes. Rotate the flywheel for more than 10 degrees before or after the TC position in order to move the flywheel hole away from the hole for the transducer. Always confirm that the holes are not aligned.
Make sure that the hole in the flywheel housing for the transducer is not aligned with the timing hole in the flywheel. Remove the protective end cap from the 6V-2197 Transducer. Insert the transducer into the adapter until the transducer contacts the surface of the flywheel. Tighten the nut on the adapter in order to secure the transducer in place. Rotate the entire adapter between one quarter turn and one half turn counterclockwise. This will move the transducer away from the surface of the flywheel by a small amount.
Illustration 1 g01045459
Configuration of the harnesses for calibrating the timing (A) DDT (B) Cat ET
Refer to Illustration 1. Perform the following steps in order to connect the harnesses:
Connect one end of the 7X-1695 Cable As to the transducer.
Connect the other end of the 7X-1695 Cable As to the 7X-1395 Cable Adapter.
Connect the other end of the 7X-1395 Cable Adapter to the harness for the service tool.
Connect the harness for the service tool to the engine mounted terminal box or to the service tool connector on the engine harness.Note: Do not connect the harness for the service tool to the remote control panel. The calibration will fail if the harness for the service tool is connected to the remote control panel. The remote control panel does not contain the wiring for the signal from the transducer.
Connect an electronic service tool to the harness for the service tool.Expected Result:The