Some FSMs list the torque for the Dana 30 and Dana 44 ring gear bolts (most are 3/8-24) as 100 ft/lbs. This is incorrect, any engineering textbook will tell you the correct torque for a grade 8 3/8-24 bolt is around 50 ft/lbs.
https://www.almabolt.com/pages/catalog/bolts/tighteningtorque.htm
this was brought up recently in another post about loose ring gear bolts IIRC.............. scares the crap out of me, the JK Dana 44 axles some of us are using have FSM ring gear torque values stated at 135 ft lbs.
the torque for a 1/2" gr8 bolt is like 80# and your between 9/16 and 5/8 to hit that 135# mark.
Are the ring gear bolts torque-to-yield?
Are the ring gear bolts torque-to-yield?
are they really stupid enough to keep making the same mistakes over and over in different FSM's? i even called RGA b4 i did this trying to confirm this info......all they said was their stuff could handle it, not whether it was right or wrong.
I used to know someone who wrote automotive tech manuals for a living. She was neither an engineer nor much of a mechanic. They're like actors...they work from a script and as long as it's all spelled correctly, that's the end of their proof-reading skills.
Some FSMs list the torque for the Dana 30 and Dana 44 ring gear bolts (most are 3/8-24) as 100 ft/lbs. This is incorrect, any engineering textbook will tell you the correct torque for a grade 8 3/8-24 bolt is around 50 ft/lbs.
https://www.almabolt.com/pages/catalog/bolts/tighteningtorque.htm
this was brought up recently in another post about loose ring gear bolts IIRC.............. scares the crap out of me, the JK Dana 44 axles some of us are using have FSM ring gear torque values stated at 135 ft lbs.
the torque for a 1/2" gr8 bolt is like 80# and your between 9/16 and 5/8 to hit that 135# mark.
are they really stupid enough to keep making the same mistakes over and over in different FSM's? i even called RGA b4 i did this trying to confirm this info......all they said was their stuff could handle it, not whether it was right or wrong.
Are you suggesting we make that other thread a sticky or make a new thread altogether?
Oh I was thinking we just make a new thread all about bulletins, like this one about corrections.
Since all these threads already exist the better idea might be to have a resource thread (or table of contents so to speak) with individual links to all the manual, service manual, bulletins, etc.
Sure, makes good sense. And yes, I see your point because that's roughly what I was starting in the thread I linked above.
We could add to that by making a thread or a post with all the bulletin PDFs, like we have for the FSMs.
Do we consider the diff cover bolt torque spec of 30lb-ft (p3-144 and 3-152) to be an error? From what I can tell they are 5/16" bolts and my Fastenal chart doesn't show any 5/16" hex head of any grade or thread pitch rated for that, with ASTM A574 fine thread, socket head cap screws being the lone exception.
If I'm wrong about this please let me know, and why.