TDC sensor — removal, installation and adjustment (Peugeot 305)

1. The TDC sensor, which is part of the diagnostic socket, is located on the lower right side of the clutch housing. Its job is to generate a signal every time a notch on the crankshaft pulley passes it. This allows the diagnostic equipment to immediately determine the TDC. The TDC sensor air gap should be adjusted after any of the following operations:

• a. clutch replacement (after replacing only the driven clutch disc, there is no need to adjust the sensor)
• b. replacing the clutch housing
• c. changing the relative position of the sensor and its support bracket
• in case the ignition timing adjustment using the diagnostic socket gives incorrect results.

2. To remove the TDC sensor, unscrew the hex bolt securing the support bracket to the clutch housing and remove the sensor together with the bracket. Do not touch the Phillips screw on the bracket. If you follow this procedure and have not performed any of the above operations, there is no need to adjust the air gap between the sensor and the clutch disc.

3. To remove the sensor from the bracket, loosen the Phillips-head clamping screw and pull out the sensor. After this, it will be necessary to adjust the air gap.

4. The sensor is installed and adjusted as follows. Install the sensor on the bracket without fully tightening the cross-head clamping screw yet. Check that the notch on the clutch is not aligned with the hole in the crankcase for installing the sensor - if they are aligned, you should turn the crankshaft slightly using a wrench placed on the bolt of its pulley. Secure the bracket with a bolt to the clutch housing and carefully press the sensor until it touches the clutch. Tighten the Phillips screw and then


unscrew the bolt and remove the bracket together with the sensor from the clutch housing. Mark the position of the sensor on the bracket, loosen the cross clamp screw and carefully pull the sensor out 1 mm from its marked position. Retighten the cross-head clamp screw. Install the bracket with the sensor on the clutch housing and tighten the mounting bolt. There should now be a 1mm gap between the end of the sensor and the clutch (see B/Figure 4.13).



Information copied from the resource: PeugeotBook.ru

5. When installing a new sensor that has not been used before, follow the above instructions until the Phillips screw is tightened, but do not remove the bolt or bracket with the sensor. After tightening the Phillips screw, the clearance adjustment can be considered complete, since the new sensors are designed for this simplified installation.