SHAFT GP-DRIVE 8Y0782 - Caterpillar

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(1) Engine speed/timing sensor
Remove engine speed/timing sensor (1). Inspect the condition of the end of the magnet. Look for wear and contaminants.
Clean any debris from the face of the magnet.
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(2) Sliphead
Check the tension of sliphead (2). Gently extend the sliphead for a minimum of 4 mm (0.16 inch). Then push back the sliphead. When the sliphead has the correct tension, at least 22 N (5 lb) of force is required to push in the sliphead from the extended position.
The sliphead must be fully extended when the speed/timing sensor is installed so that the sensor maintains the correct clearance with the speed-timing wheel. If the correct clearance is not maintained, the signal from the sensor will not be generated.Do not install the sensor between the teeth of the speed-timing wheel. Damage to the sensor would result. Before installing the sensor, ensure that a tooth of the wheel is visible in the mounting hole for the sensor.
Install the engine speed/timing sensor.
Ensure that a tooth on the speed-timing wheel is visible in the mounting hole for the sensor.
Extend sliphead (2) by a minimum of 4 mm (0.16 inch).
Coat the threads of the sensor with 4C-5598 High Temperature Anti-Seize. Note: The sliphead is designed to contact a tooth of the speed-timing wheel. The maximum allowable gap between the sliphead and the tooth is 0.5 mm (0.02 inch).
Install the sensor. Tighten the locknut to 40 5 N m (30 4 lb ft). Timing Calibration
Calibration of the timing is required only after the following circumstances:
The Electronic Control Module (ECM) has been replaced.
The speed/timing sensor has been replaced.
The speed-timing wheel and/or the rear gear train have been adjusted.
The speed-timing wheel and/or the rear gear train have been replaced.The Caterpillar Electronic Technician (ET) uses the engine speed/timing sensor to help calibrate the engine timing. For instructions on the timing calibration, refer to Troubleshooting, "Engine Speed/Timing Sensor - Calibrate".