Case hardening amounts to usually the outer 10 to 15 thousandths of the metal. I think that lifters and cams are hardened all of the way through. Case hardening is usually accomplished by some method of surface treatment - most commonly gas ion nitriding. Fully hardened items like cams and lifters are usually accomplished as a combination of specific alloys and procedures for heat treating. In the case of case hardening, once you remove that "case," the underlying metal is no longer as hard as it needs to be in its application. Premature failure of the component usually results.
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Today's Featured Article - A Tinker�s Guide to Manifold Repairs - by Curtis Von Fange. A common characteristic of keeping older equipment is that some parts to make repairs can be extremely difficult to locate. For example, finding a replacement for a cracked intake or exhaust manifold on a unique tractor or odd brand can be a frustrating and downright impossible mission. So, what is an alternative solution to scraping out that �one of a kind� piece of history? First, decide if you are one to try a repair yourself or have someone else do it. If you are uncomfortable about
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