Selecting an adjusting ring for adjusting the preload of secondary shaft bearings (VW Passat B4)

If the secondary shaft, main gear or clutch housing tapered roller bearings are replaced, adjust the shaft roller bearing preload. Install a 0.65 mm thick adjusting ring and the outer ring of the secondary shaft front bearing into the clutch housing socket. Install the secondary shaft and tighten the nuts of the front bearing cover bolts to a torque of 3 kgf·m.

Attach the stand with the indicator to the clutch housing (Fig. 4-34) and install the indicator leg on the end of the secondary shaft.



By moving the secondary shaft up and down in the axial direction and without turning it, mark the axial movement "X" of the secondary shaft on the indicator.

Calculate the required thickness "T" of the adjusting ring using the formula: T = 0.65 + 0.20 + X, where 0.20 mm is the value of the required preliminary load of the bearing.

Install an adjusting ring of the thickness found in this way under the outer ring of the bearing, install the secondary shaft with bearings, having previously lubricated them with oil, and check the moment of resistance to rotation of the secondary shaft bearings (Fig. 4-24), which should be 0.3 kgf·m for worn-in bearings, and 1.3-1.8 kgf·m for new bearings.