The VAZ-2121 gearbox input shaft bearing is pressed into the rear part of the engine crankshaft
We carry out the work on an inspection ditch or a lift.
Remove the bearing for replacement.
Usually, when replacing clutch discs, you need to check the condition of the bearing.
The bearing should not jam or have radial play.
When this bearing wears out or jams due to lack of lubrication, the effect of “driving” the clutch occurs - difficult gear shifting.
Remove the flywheel (see Replacing the rear crankshaft oil seal).
To remove the bearing, you can use a simple puller.
Insert an M8 bolt 60–80 mm long with the head into the hole in the inner ring of the bearing so that it engages the rear edge of the ring.
Wedge the M8 bolt with any rod with a diameter of 7 mm (you can use an M8 bolt or pin, ground or flattened to a size of 7 mm).
We put a suitable piece of pipe (with an internal diameter of 36–40 mm), a large washer on the bolt and attach a nut.
Tightening the nut, press out the bearing.
The bearing can be knocked out using an impact puller with a hook hooked onto the inner ring.
There is another old-fashioned way to remove the bearing.
We take any unnecessary fabric, rags.
We tear it into small pieces and push these pieces of rag into the inner surface of the crankshaft through the inner hole of the bearing.
By driving these rags in using a drift of a suitable diameter, they will begin to squeeze out the bearing.
Instead of rags, you can use sawdust with lithol diluted in a 1:1 ratio.
You can use a mandrel to center the clutch driven disc as a drift.
Use fine-grained sandpaper to clean the seating surface under the bearing in the hole in the crankshaft flange.
We press in the bearing using a suitable piece of pipe, resting only on the outer ring of the bearing.
In the reverse order of disassembly, install the dismantled parts: flywheel, driven and driven clutch discs, gearbox.