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-   -   Case Studs for '75 911 (http://forums.pelicanparts.com/911-engine-rebuilding-forum/1051486-case-studs-75-911-a.html)

tlholliday 02-02-2020 07:05 AM

Case Studs for '75 911
 
I am rebuilding a '75 911. I had time-sert case savers installed. I am now trying to install the original case studs and the studs stop about 2mm shy of the 135MM installation spec(137mm vs 135mm). The threads on the studs and the time-serts are clean. I haven't tried to muscle them down any further for fear of damaging something.

Any advice on how hard it should be to install the studs and how much force is reasonable? What other things should I be considering?

Thanks in advance for your comments and suggestions.

colingreene 02-02-2020 09:31 AM

when i installed my head studs into my aluminum block it took a fair bit of force however mine mostly had to do with the factory sealant that comes on them as you start turning it you better mean business because
it set up quick.

r lane 02-02-2020 12:33 PM

I assume they are not bottoming on something, so think the broach that cleans up the insert did not go all the way. You want them to go in tight, but not where you have to lean on the wrench. Bob

tlholliday 02-02-2020 12:36 PM

They aren't bottoming. Any suggestions on how to clean it up now?

spyerx 02-03-2020 06:38 AM

thread chaser? maybe hard on a blind hole...

Note I'm not a machinist!

Flat6pac 02-03-2020 08:32 AM

I use a dilivar stud that I have cross cut in the threads to allow the old trash to have a place to go then double nut the other end and run stud in and our a couple times. Blow out with air gun.
You should be using dilivar studs to stop the pulling problem, factory steel will continue to pull as before.
Bruce

stownsen914 02-03-2020 05:21 PM

I thought that with inserts in the mag cases, it was supposed to be OK (or preferable?) to use steel studs?


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