Yaroslavl Engine Plant YMZ-536 Operation Manual page 138

Fig. 46. Valve mechanism adjustment:
13. Start the engine and make sure that there is no leakage on the
junction of the cylinder head cover and the crankcase gas
discharge hose pipe
138
1 – rocker arm; 2 – rocker arm setscrew;
3 – lock nut; 4 – yoke; 5 – rocker arm cap