Attention: If the engine is started for the first time after the vehicle has been parked for a long time, the hydraulic tappets may make a loud noise; this effect occurs if all the oil from the hydraulic tappets has flowed out, and therefore gaps have reappeared in the valve drive. You should not worry about this: soon the knocks will disappear, and the valve actuator will work again silently. If one of the hydraulic tappets knocks for a long time even after the engine has warmed up, it needs to be checked.
Install the cylinder head cover and intake pipe.
Hydraulic tappet
1 - camshaft cam;
2 - chamber with oil reserve;
3 - check valve;
4 - oil channel;
5 - high pressure chamber;
6 - valve stem;
7 - pusher spring;
8 - pusher plunger;
9 - piston (is integral with the body);
10 - pusher body.