G3500B Engines Caterpillar

For proper operation, the condition and installation of the sensor must be correct. If the condition or the installation of the sensor is suspect, use the following procedure.

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Illustration 1	g00760464
(1) Engine speed/timing sensor

1. Remove engine speed/timing sensor (1). Inspect the condition of the end of the magnet. Look for wear and contaminants.

2. Clean any debris from the face of the magnet.
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   Illustration 2	g00909543
   (2) Sliphead

3. 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.

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   NOTICE
   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.

4. Install the engine speed/timing sensor.

   1. Ensure that a tooth on the speed-timing wheel is visible in the mounting hole for the sensor.

   2. Extend sliphead (2) by a minimum of 4 mm (0.16 inch).

   3. 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).

   4. 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 master 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".