If valves are bent you need to take a close look at the corresponding piston. Valves don't just bend. They get slapped by a piston if they float at high RPMs due to things like worn or weak springs, or if are out of time. If you don't find the cause it WILL happen again, very soon or immediately at first turn over or startup.
I remember once a fella brought a piston to me with a big hole in the dome and he asked what would cause that. I asked him where the head was. He said he pulled the heads and set them off to the side without looking at them when he tore the engine down. I told him to let me see the head. When he brought it in, the valves were mangled, half of the combustion chamber was missing as well. Head was scrap. His problem was caused by weak springs at high RPMs, the valves floated and hung there instead of following the cam duration and the piston pounded them through the combustion chamber into the runners, and that's what made the big hole through the piston dome.
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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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