[6pack] TR6 oil gallery leak

[Sally or Dick Taylor]

Peter---As Mr. Lang said, these plugs come in stick form (about five plugs to a stick). They have straight threads on them. 3/4" fine, I'm reasonably certain. 
When the machine shop hot tanked my block many years ago, all of the plugs  except this one was removed. This aluminum plug was never a good seal after that. If you use the stick as a replacement, I would suggest that you cut off one piece of it (easy to know where, when you see it), then hacksaw a slot at one end so you can insert it with a screwdriver.
Looking back, I could never get the replacement plug to seal, as it is exposed to the full oil pressure at this point. All sorts of sealer was used, in about three or four different attempts.
I finally ended up using a 3"X 3/4"x16 bolt, cut off to where there were only about 1/2 of an inch of threads left below the shank. Screwing this bolt into the block to where the threads end against the shank tightened it up to where the leak stopped.  Yes, the bolt head is exposed to critical eyes, but it doesn't leak! Put a Happy Face on it?

Dick