Many modern heads are "90 ft/lbs PLUS 1/4 turn"


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Posted by Chriscase [107.201.17.237] on Friday, February 28, 2014 at 16:31:26 :

In Reply to: Re: You forgot to loosen the 1/6 turn. posted by CSCameron [174.26.45.190] on Friday, February 28, 2014 at 15:25:47 :

It's not witchcraft. They call them "stretch head bolts". But you don't have any experience along those lines.

So basically, your bearings have 30 ft/lbs of the inner nut, plus 50# of the outer nut, for a total load of 80 ft lbs. NOBODY said to do it that way.

While there are variations, everybody backs it off, some to zero torque, some to 1/6 to 1/4 turn. That allows for the tightening of the outer nut without excessive preload on the bearings.

The synopsis, as I read this thread, is somewhere between 0-100 ft lbs, loosen 1/6 turn, install lock ring, and tighten outer to from 50-100.

So you are now tighter than the norm by 1/6 plus 30 ft lbs. Does it matter? Time will tell. 10 years ought to do.



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