21-05-2021, 01:23 PM
I am building up my sports crankcase and need to rework the rearmost crankcase to block stud hole. In the past this has been tapped 7/16 bsf and stepped to 5/16. Unfortunately, whoever did this managed to tap the hole out of true and so I have made up a 7/16 threaded plug in 6082 aluminium which I will install and then drill and tap in situ.
The threads on the new plug are good, and those in the crankcase are acceptable, but I don't want to make extraction of the plug in the future a destructive event as there's not enough meat to take it out to 1/2".
I intend using loctite on the plug thread, but the more I read up about the many different Loctites out there, the more choice there seems to be. I have both 243 and 248 on the shelf, but am after something that will fill any small voids in the thread form as strongly as possible but not make the whole thing permanent.
Recommendations from those with experience very welcome please.
Photo shows the old stud.
The threads on the new plug are good, and those in the crankcase are acceptable, but I don't want to make extraction of the plug in the future a destructive event as there's not enough meat to take it out to 1/2".
I intend using loctite on the plug thread, but the more I read up about the many different Loctites out there, the more choice there seems to be. I have both 243 and 248 on the shelf, but am after something that will fill any small voids in the thread form as strongly as possible but not make the whole thing permanent.
Recommendations from those with experience very welcome please.
Photo shows the old stud.