Yaroslavl Engine Plant YMZ-536, Operation Manual, Page: 71 / 168

71
VALVE TRAIN
The valve train controls admission of fresh air into the
cylinders and release of exhaust gases out of the cylinders according
to the cylinder firing order and engine strokes.
The valve train is OHV type, with the camshaft below the
cylinder head; the valves are actuated by means of lifters, pushrods,
rocker arms and yokes (Fig. 19).
Fig. 19 Timing mechanism
1
– camshaft cam;
2
– tappet;
3
– pushrod;
4
– valves;
5
– valve seat;
6
– valve guide;
7
– valve spring washer;
8
– valve spring;
9
– cup-type seal;
10
– valve split cone;
11
– valve spring cap;
12
– yoke;
13
– rocker arm;
14
– rocker arm shaft;
15
– rocker arm adjusting screw