Remove the sealing rings, press out the outer rings of the differential bearings from the clutch housing and remove the adjusting rings.
Press in the outer race of the tapered roller bearing from the side opposite the teeth of the driven gear of the final drive, with the adjusting ring «A» (see diagram) 1.20 mm thick.
Scheme of installation of devices for determining the preload of differential bearings and calculating the thickness of the adjusting ring: A - adjusting ring with a thickness of 1.20 mm
Press in the outer ring of the differential bearing from the side of the teeth of the driven gear without the adjusting ring.
Install the press-fitted inner race differential without the speedometer drive gear and install the differential cover.
Install the differential so that its axis is in a vertical plane (see diagram).
Install the indicator support mandrel to the differential case.
Fasten the indicator with a special tool, ensuring a full stroke of the leg of 3 mm. Mount the indicator leg on the support mandrel with a preload of 1 mm. In this position, fix the indicator and set its arrow to zero.
By moving the differential up and down, using, if necessary, bushings VW 521/4 and VW 521/8 (see diagram), use the indicator to determine the axial movement «IN» differential and calculate the thickness «S» adjusting ring of differential bearings according to the formula: S=A+B+C, where:
- S is the thickness of the adjusting ring;
- A - thickness of the adjusting ring, equal to 1.20 mm;
- B - the value of the axial movement of the differential;
- C - the value of the preload of the differential bearings, equal to 0.40 mm.
Install adjusting rings of the required thickness under the outer ring of one of the differential bearings and check the backlash in the engagement of the final drive gears. If new bearings are installed, check the moment of resistance to rotation of the differential. which should be equal to 250 N cm.
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