Camshaft
Cast, cast iron, the same for engines 2101 and 21011. Relies on 5 necks and rotates in an aluminum bearing housing mounted on the cylinder head. A driven sprocket is attached to the front end of the camshaft. From axial movements, the camshaft is held by a thrust flange placed in the groove of the front bearing journal of the shaft.
On VAZ vehicles until April 1982, camshafts with cams and bearing journals hardened by high-frequency currents were installed. From April 1982, nitrided camshafts were installed. Since 1984, the year of manufacture has been marked on the shafts. Since 1985, camshafts with camshafts have been installed. These shafts have a distinctive hex collar between the 3rd and 4th jaws.
Camshaft drive. The same on engines 2101 and 21011. It is carried out from the drive sprocket 5 (pic. 16) crankshaft with a double-row roller chain 2. The same chain drives the sprocket 4 of the oil pump drive shaft. The chain drive has a semi-automatic tensioner 8 with a shoe 7 and a chain damper 3 with rubber pads.
A restrictive pin 6 is installed in the lower part of the cylinder block, which prevents the chain from falling into the crankcase when the camshaft sprocket 1 is removed from the car.
For the correct relative position of the sprockets, i.e., for setting the valve timing, there are upper and lower alignment marks. The upper ones are located on the camshaft sprocket and bearing housing (see fig. 56). Lower marks - on the crankshaft sprocket and cylinder block (see fig. 54). When the chain drive is covered (engine mounted on car), then you can use the marks to set the ignition timing (see fig. 57). In this case, mark 4 on the alternator drive pulley must be set against the long mark 3 on the camshaft drive cover.