What are self adjusting valves?

Answer

There is no such thing as self adjusting valves. There is however, Hydraulic Lifters; The lifters run on the cam and work the push-rods. Hydraulic lifters are "kind of" self adjusting. It's only within a certain range and you have to get them close. A hydraulic lifter has four parts; the body, the plunger, small (internal) spring, and a retaining clip. If you look at the side of one, you will notice that there is a small hole. It's through this hole that oil is fed under pressure!

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