Hi Contributors,
I plowed through this CV joint rebuilding thread as I am installing rebuilt CVs on my 83 SC. They have 100mm joints, with new M8 bolts, VW lock plates, and Schnorr washers. My only question is if anyone knows where the 33 ft-lb torque spec came from?
https://forums.pelicanparts.com/porsche-911-technical-forum/222537-reconstructing-constant-velocity-cv-joints.html#post1922501
My copy of the Bentley has conflicting values. Also cross-referencing generic torque spec tables such as this one from Fastenal list 12.9 M8 bolts installed dry at a max torque of 31.4 ft-lbs.
https://www.fastenal.com/content/feds/pdf/Torque-Tension%20Chart%20for%20Metric%20Fasteners.pdf
I am by no means saying 33 is wrong, its just very difficult to find objective data listed anywhere and some of the online sources such as Fastenal may simply be trying to stay conservative. I checked my Machinery's Handbook and only found dimensions and strengths but no torque chart for different grades.
Thanks again for the advice. I wonder if the original post can still be edited to contain summary info with references, like the CIS for Dummies thread.