Features of the camshaft device and its drive

Camshaft - cast iron, rests on five necks and rotates in an aluminum bearing housing mounted on the cylinder head. The main dimensions of the camshaft and bearing housing are given in fig. 2-54. Cam surfaces are whitened for increased wear resistance. From axial movements, the camshaft is held by a thrust flange placed in the groove of the front bearing journal of the shaft.



Camshaft drive. Carried out from the leading sprocket 5 (pic. 2-55) 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.