Replacing differential seals
The differential seal rings are located on both sides of the gearbox, where the drive shafts are connected to the gearbox.
Raise the front of the vehicle and support it on stands. Remove the appropriate drive shaft.
Wipe off the old sealing ring and when replacing it on a B5 or iB5 gearbox, pay attention to the orientation and installation depth of the sealing ring. On MTX-75 type gearboxes, the sealing ring is installed until it stops in the gearbox housing. Using a screwdriver or lever, carefully remove the sealing ring from the gearbox housing (see Fig. 7A.17).
Wipe the sealing surface of the transmission housing seal ring.
Lubricate the new O-ring with clean engine oil, then insert it into the transmission housing by hand.
Using a suitable tubular mandrel, install the sealing ring into the seat to the required depth (see Fig. 7A.18).
Install the drive shaft.
Gear Selector Shaft Seal Ring
Raise the front of the vehicle and support it on stands.
Remove the bolt securing the shift rod to the shaft at the rear of the transmission. Remove the shift rod and remove the rubber boot from the shaft.
Using a suitable tool or grips, remove the sealing ring from the gearbox housing. If there are no special tools for removing the sealing ring, it can be removed using the following method. Drill two small holes in the sealing ring, on opposite sides of the ring. Screw self-tapping screws into the holes and remove the sealing ring by the screw heads.
Wipe the sealing surface of the transmission housing seal ring.
Lubricate the new O-ring with clean engine oil, then insert it into the transmission housing by hand.
Using a suitable tubular drift, install the sealing ring until it bottoms out into the transmission housing.
Install the rubber protective boot onto the gear shift shaft.
Connect the gear shift rod to the shaft and tighten the mounting bolt.
Adjust the shift rod if necessary.