[Healeys] 3/8 BSF studs

[Michael MacLean]

 I sent for the exhaust flange studs from one of the usual suppliers for my BN2 because I had none with the exhaust manifold that I obtained for this car.  Turns out they sent me a 5/16ths thread size for screwing into the flange.  Probably a BSF thread. but it turned out to be too small.  Somewhere along the way of this manifold's life someone re-tapped the holes to a larger (3/8ths?) course SAE thread.  Plain Chevy manifold flange bolts you can buy in any parts store fit perfectly and the set comes with locking nuts.  Not to overthink this or create more work for myself, I decided to go with the flow and just bought the Chevy studs and worry about the next thing that does not fit correctly on my project.  

    On Friday, June 26, 2020, 12:00:39 PM PDT, Per Schoerner <per at schoerner.se> wrote:  
 
 Michael
Happened to me too, but the other way around. I accidentally bought studs for a 100 when I restored a 3000. I couldn’t understand why the studs didn’t fit, until many swear words later I discovered my mistake.

Per

Skickat från min iPhone

> 26 juni 2020 kl. 16:55 skrev Michael Salter <michaelsalter at gmail.com>:
> 
> 
> 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 

_______________________________________________
Support Team.Net http://www.team.net/donate.html
Suggested annual donation  $12.75

Archive: http://www.team.net/pipermail/healeys http://autox.team.net/archive

Healeys at autox.team.net
http://autox.team.net/mailman/listinfo/healeys

Unsubscribe/Manage: http://autox.team.net/mailman/options/healeys/rrengineer.mike@att.net

  
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://autox.team.net/pipermail/healeys/attachments/20200626/b4b81f42/attachment.htm>