Yaroslavl Engine Plant YMZ-536, Operation Manual

Page: 74 / 168

74
The rocker arms are pressed to the shaft supports by a spacer
spring installed on the shaft between neighboring rocker arms.
Fig. 21 Valve drive system
1
– shaft with rocker arms and shaft supports;
2
– pushrod;
3
– tappet;
4
- yoke
Intake valves are single-piece design, made of heat-resistant
alloy steel and heat-treated. The valve cap diameter is 36 mm.
Exhaust valves are welded. The valve stem is made of alloy
steel; the valve cap and part of the stem are heat-resistant steel. The
valves are heat-treated. The valve cap diameter is 34 mm.