Remove the front axle gearbox as described in the article - "Removing and installing the front axle gearbox"
Install the gearbox on the workbench.
Unscrew the eight nuts securing the front cover to the gearbox housing with a 10 key
Removing the front cover
Removing the gasket
Using a 10 mm socket, unscrew the bolt securing the locking plate of the left differential box bearing cover and remove the plate.
Also remove the locking plate of the right cover.
Using a 19 mm socket, unscrew the four nuts securing the differential box bearing caps
Remove the washers from the studs
We use a screwdriver to pry off the cover of the left bearing of the differential box
Remove the cover of the left differential box bearing
To remove the cover of the right bearing, screw the bolt into the hole for fastening the locking plate and, pulling the bolt, remove the cover
Removing the adjusting nuts
Removing the differential box assembly with the driven gear of the main transmission.
Differential repair is identical to rear axle differential repair.
Remove the pinion oil seal from the gearbox housing socket (for removal and installation of the oil seal, see the article - "How to replace the pinion oil seal of the rear axle VAZ-2121").
Removing the inner ring of the rear bearing of the pinion gear
Removing the pinion gear with inner ring, separator, spacer sleeve and front bearing rollers.
By striking the punch with a hammer, knock out the outer ring of the front bearing
We take out the ring
We also dismantle the outer ring of the rear bearing
If oil is leaking from under the lower cover of the gearbox housing, then with a 10 head we unscrew the eight bolts of its fasteners
Removing the cover
Remove the sealing gasket
See the article - "How to assemble the VAZ-2121 rear axle gearbox" for checking the technical condition of the parts.
In addition, check the condition of the bearings of the inner joint housings of the drives.
There should be no cracks or signs of wear on the seats of the gearbox housing.
Replace worn and damaged parts with new ones.
To set the differential box bearing preload, tighten both bearing adjusting nuts sequentially and evenly until the distance between the covers is 0.08-0.11 mm.
Replace the gearbox cover sealing gaskets.
Apply sealant to the gaskets before installation.
Press in new outer bearing rings of the drive gear using suitable pipe sections.
