If there are signs of oil leakage through the crankshaft seals, first check if the crankcase ventilation system is clogged and if its hoses are pinched, repair if necessary
If the oil leak does not stop, replace the oil seals.
A sign of the need to replace the front crankshaft oil seal is oil leakage through its edge.
In this case, the oil is sprayed by the rotating crankshaft pulley, as a result of which the entire front of the engine and the timing belt are oiled.
Disconnect the wire from the negative terminal of the battery.
Set the piston of the 1st cylinder to the TDC position of the compression stroke (see "How to set the TDC of the VAZ-21126 engine").
Remove the timing belt (see "Replacing the timing belt of the VAZ-21126 engine").
Pry off the pulley with two screwdrivers
Remove the crankshaft sprocket.
Remove the key from the crankshaft shank groove.
Using a screwdriver, remove the oil seal from the oil pump cover.
Lubricate the working lip of the new oil seal with engine oil, install it in the oil pump cover, orienting the working edge inside the engine, and press the oil seal into the pump cover until it stops with a mandrel.
As a mandrel, you can use a suitable size socket from the toolbox.
Install all removed parts and assemblies of the gas distribution mechanism in the reverse order of removal.
Adjust the tension of the timing and alternator drive belts
Replacing the crankshaft rear oil seal
The reason for oiling the clutch discs may be a leak in the gearbox input shaft oil seal or the crankshaft rear oil seal.
Engine and transmission oils differ in smell.
With a certain skill, it can be used to determine which of the oil seals is defective.
You will need: a screwdriver with a straight blade, a mandrel.
Remove the gearbox.
Remove the clutch.
Remove the flywheel.
Inspect the gland.
If it has lost its tightness, an oil leak will be visible in its lower part.
Pry off the oil seal with a screwdriver.
Lubricate the working lip of the new oil seal with engine oil, install it in the seat of the cylinder block, orienting the working lip into the engine, and carefully fill the working lip onto the crankshaft journal.
Press the oil seal into the seat until it stops, using a suitable mandrel
Install the removed units in the reverse order of removal.
When installing the flywheel, lubricate the threaded part of the flywheel mounting bolts with Loctite threadlocker or any similar anaerobic threadlocker.