Posted by Chriscase [108.225.238.206] on Friday, February 28, 2014 at 08:53:34 :
In Reply to: Spindle Nut Torque? posted by CSCameron [174.26.45.190] on Thursday, February 27, 2014 at 14:49:45 :
All the components involved are big and heavy duty. Not much flex. I doubt there is much actual difference between 'just snug', '13-30 ft/lbs', or '100ft'lbs'.
So, anybody got a socket and torque wrench handy? What fraction of a turn does it take to get from 20 to 100 ft lbs?
Oh, do it twice, the first time it might jsut be seating the parts that didn't get driven all the way home. Which is probaly Charles's point of going to 100 in the first place.
Of course you then back them off, for a bit of free play. But then tightening the lock nut later takes that free play out too. Net result when all done is a bit of pre-load. Maybe like in transfer cases, .010"? But nobody wants to discuss how many foot lbs it takes to make .010" there. Or a differential pinion nut, 250 ft/lbs?
Too tight and they can be overloaded, especially when expanded due to heat. Too loose, and the weight of the truck will be on only one roller at a time.
But the happy place is not all that critical- some where within that difference in rotation of 20-100 ft lbs.
Hmmm, lessee, 20 turns per inch of the nut = .050" per turn. 1/6 turn = .008"......