[Healeys] 3/8 BSF studs

[gradea1 at charter.net]

Michael- This is a common scene on the early cars. Happened to me,
often, as well as others I'm sure. The real "clue" to the issue is as
you said: "but after a few turns became tight"..as soon as I get that
indicator I get out my Whitworth thread gauge.
I'm currently working on a 100 transmission that had its studs
"modified"...I guess that's why we have British Tools and Fasteners in
Lyons, N.Y. Hopefully not too many mods to your car- studs are $4.50
each, but correct BSF thread. That issue cost me $50 to be able to
button up this gearbox to the overdrive. Regards, Hank

	-----------------------------------------From: "Michael Salter" 
To: healeys at autox.team.net
Cc: 
Sent: Friday June 26 2020 7:55:29AM
Subject: [Healeys] 3/8 BSF studs

The 100 that I'm restoring has been previously "restored" so I'm being
pretty careful with threads and running taps and chasers through any
that look even slightly suspicious. The exhaust flange studs on a 100
(2K7708) are 3/8" BSF and 3 years back the ones on this engine looked
to be in such good shape that I decided that running a chaser down
them wasn't necessary. Silly me!!With one of the last jobs being
installing one of my specially made single sweeping curve front pipes
I confidently started running the BSF nuts up to secure the flange. On
the last one the nut started well but after a few turns became tight
.... as is my usual practice I decided to back it off and run a chaser
up the stud to clean up the thread.Ahhh Houston .... the nut had
seized tight on the thread and despite every trick the stud eventually
broke off at the top of the thread.Now this is on an engine that I
have painstakingly restored however, there was no option but to remove
all the manifolds to replace the stud ... Only after all that did I
discover that this 1 stud had been replaced with a UNF and that was
why the brass nut had locked onto it ...Yeeech!!!!!How was your day?

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