I've run into a few briggs lawn mower engines with valve seat recession. They were flat heads and some times it was the intake valve.
I remember the old VW air cooled engines. They had no oil filters and you were to change the oil every 1500 miles and while you were at it, pop the valve covers off and adjust the valves. The VW was bad for burning valves and valve seat recession. BTW, we had lead in the gas too.
However, today's briggs and kohlers with overhead valves, it seems to be the opposite problem. The valve clearance increases, causes the compression to go up and it acts like you have a bad starter or a dead battery. I had to readjust the valves on 3 briggs this spring. I'm no rocket scientist, but I would think if one had valve seat recession on OHV engine, the valves would tighten up, not do the opposite.
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Today's Featured Article - Hydraulics - Cylinder Anatomy - by Curtis von Fange. Let�s make one more addition to our series on hydraulics. I�ve noticed a few questions in the comment section that could pertain to hydraulic cylinders so I thought we could take a short look at this real workhorse of the circuit. Cylinders are the reason for the hydraulic circuit. They take the fluid power delivered from the pump and magically change it into mechanical power. There are many types of cylinders that one might run across on a farm scenario. Each one could take a chapter in
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