22-05-2021, 01:45 PM
Many thanks for the replies. I have to plug the 7/16" tapped hole and then drill and tap this plug 5/16" due to the hole being skew and I want the new stud perpendicular to the casing.
In the end I decided to make the plug a permanent part of the crankcase and have installed it with JB Weld. I squared off the end of the plug and used a 12" tap wrench to wind it hard down. Once it's cured I shall drill a pilot hole to retain the centre, remove the material proud of the casing and finish off by lapping the entire surface on a granite worktop with Timesaver.
Hopefully a permanent fix ready for drilling and tapping back to 5/16" BSF.
In the end I decided to make the plug a permanent part of the crankcase and have installed it with JB Weld. I squared off the end of the plug and used a 12" tap wrench to wind it hard down. Once it's cured I shall drill a pilot hole to retain the centre, remove the material proud of the casing and finish off by lapping the entire surface on a granite worktop with Timesaver.
Hopefully a permanent fix ready for drilling and tapping back to 5/16" BSF.