Sectional view of hydraulic tappet valve control mechanism:
1 - camshaft cam
2 - oil cavity
3 - reverse cap
4 - oil supply with annular groove
5 - high pressure cavity
6 - valve stem
7 - pressure spring
8 - cylinder
9 - piston
10 - pusher cup
Oil under high pressure is shown in red; pink is the volume of oil not used to drive the valve.
On Volkswagen diesel engines, cylinder head gaskets of different thicknesses are installed depending on whether the pistons used have deviations in the upper or lower part. Since the gasket, as we know, is installed between the block and the cylinder head, it is possible to vary the height of the combustion chamber by choosing its thickness and thus equalize the different heights of the pistons.
The information is presented on the website vwmanual
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