Suggestion on removing oil ball check plug

[MarkLindyHugo]

I'm looking for suggestions on how to free/remove the slot head plug to get access to the check ball and spring. I've tried a large screwdriver, and a hand held impact driver, but it does not budge. I have tried penetrating oil, and hitting it with a brass drift.

[BigLakeBob]

For some of my projects this past year I've worked on several oil pumps that involved removing the screw plugs you mention and also the check valve rusted in. Everyone has their magic solution, what has worked best for me recently is kroil, heat, kroil, heat etc. Oh yea, patience. The only thing I would do different is not doing that with the pump on the motor as you show. Something else will get damaged, locating dowel pins, case, etc. Not what you want to hear, disassembly is involved. If you want to do it while assembled, I would try a flat punch against the slot instead of beating downward using an impact screwdriver. Try using a screwdriver with the hex on top to fit a box wrench, or a proper fitted driver bit fitted to a socket drive that will give greater force closer to the frozen plug and heat at the same time. My suggestions.

[joe fxs fxr]

Heat and kroil are my go-to's also.

[Rubone]

And use a drag link socket, not a screwdriver which merely destroys the slot.

[dukekleman]

Mark,
There is a specific specialty tool to install and remove those caps.
However, seeing the current condition of your cap, I would Tig Weld ( not Mig ) a flange nut to the cap. Then use a box wrench or 1/4 " drive ratchet and socket to remove the cap.

Hope this helps,

Duke Kleman