The chain tension is regulated by an automatic tensioner with a hydraulic damping mechanism. The camshaft and crankshaft sprockets are mounted on segment keys and bolted.
Camshaft
Camshaft (pic. 6.8) semi-support, rotates in plain bearings with a diameter of 23 mm. The drive chain sprockets are mounted on the camshafts.
Thrust bearing width 19.00 - 19.10 mm.
Axial movement of the camshaft:
- nominal - 0.150 - 0.330 mm;
- the maximum allowable is 0.55 mm.
Radial clearance between the shaft journals and its bearings:
- nominal - 0.047 - 0.088 mm.
- maximum allowable - 0.1 mm.
Camshafts of nominal size are marked with blue paint, repair size - yellow. The mark is applied between the first and second cams.
The timing chains are closed with protective covers, the execution of the lower cover is shown in Figure 6.50, the upper part of the cover is made together with the cylinder head cover (see fig. 6.4).