Attention! We carry out work on a viewing ditch or a lift. We hang out the rear axle.
Drain the oil from the rear axle housing (see Rear axle oil change).
Removing both shafts (see Removing the axle shaft and replacing the oil seal).
Disconnect the rear propeller shaft from the flange of the rear axle gearbox (see Removing the cardan shaft).
We remove the cardan shaft from the gearbox flange.
We tie the cardan shaft by the hinge fork to the upper longitudinal rod.
Using a dynamometer, we turn the drive gear clockwise by the flange fastening nut and determine the moment of resistance to the rotation of the gear.
We insert the bolts into the two nearby holes of the flange and screw the nuts onto them.
Inserting a powerful screwdriver between the bolts, we keep the flange from turning, and the head «at 24» Loosen the flange nut.
The flange can also be fixed with a mounting spatula.
Remove the flange nut and washer.
With a hammer with a plastic striker, we knock off the flange from the splines of the drive gear..
...and take it off.
With a slotted screwdriver, pry the oil seal of the drive gear..
...and take it out.
We lubricate the working surface of the new oil seal with Litol-24 grease..
... and press it into the socket of the gearbox housing with a suitable piece of pipe.
Install the flange and washer on the drive gear. Holding the flange, tighten its fastening nut to a torque of 118–255 N·m (12–26 kgf·m), periodically checking the moment of resistance to rotation of the drive gear (turning the gear clockwise with a dynamometer).
If the originally measured torque (see photo 3) was not lower than 59.0 N.cm (6 kgf.cm), then the new moment should be greater than this value by 9.8–19.6 N.cm (1–2 kgf.cm). If the initial moment was less than 59.0 N.cm (6 kgf.cm), then we tighten the flange fastening nut until the moment of resistance to rotation is reached 59.0–88.0 N.cm (6–9 kgf.cm), without exceeding the tightening torque of 118–255 Nm (12–26 kgf·m). If, when tightening the nut, the moment of resistance to rotation of the drive gear exceeded 88.0 N.cm (9 kgf.cm), which indicates an overestimated bearing preload, replace the gearbox spacer (see Disassembly of the rear axle gearbox) and re-adjust.
Further assembly and installation of nodes is carried out in the reverse order.