I am working on my old motor, and I want to install petcocks, and possibly an oil pressure sensor in the front gallery plug.

After 43 years, all three of the plugs seem welded in.

Any tips to get them out, short of drills, chisels and taps?

They have had three days of ATF/Acetone treatment....

Thanks -

Rocky
Original Post
The plugs in the water jacket are likely rusted into the block after 40 years. You may wish to try some heat from a oxygen/acetylene torch in combination with penetrating oil, but there is the danger that you could crack the block and that would ruin your whole day.

It might be best to drill them out and retap the threads.

Either way it is a job that requires considerable skill, not something for the novice.
Dear Rocky,


I am rebuilding an engine again. I had the same problem with the block plugs, too. I tried everything short of an acetylene torch and the AERA parafin trick. I admitted defeat and had the machine shop remove the things with the rest of the machine operations. Good luck. Let us know if it works.

Warmest regards, Chuck Engles

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