The problem with trying to do any kind of thread repair is getting the hole drilled and tapped straight. With nothing to reference to, it is impossible to use a drill guide, eye-balling it is a gamble at best. (A bad gamble if I'm holding the drill!)
If the pan is accessible the best solution would be to replace it.
If I were going to try repairing it installed, I think (without seeing it) I would pull the Helicoil out, carefully try to drill the straightest hole possible and tap it for taper pipe thread. (Just an FYI, a taper tap only goes part way into the hole, typically leave about 6 threads showing). Reason for using taper pipe, a taper thread hole is more forgiving of being crooked that an Oring or gasket type plug.
To minimize chips, dip the drill and tap in heavy grease to "help" trap the chips, rinse the hole with spray cleaner afterward. Work it with the hole in the downward position.
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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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