Re: I've always wondered... - Saab 9000 Bulletin Board - Saabnet.com
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Re: I've always wondered...
Posted by Anders (more from Anders) on Fri, 6 Dec 2002 11:27:21
In Reply to: I've always wondered..., CalAero, Fri, 6 Dec 2002 11:11:44
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As harder you tighten a bolt as more inaccurate does the torque wrench becomes.
This is due to all the friction that is created at bolt head flange and by the threads gripping the engine block.
Theoretically, you can tighten a bolt to 60 lbf ft, crank up the torque wrench to 80 lbf ft and the bolt wont move because of the friction added.
By stopping short at the second stage, before the friction becomes a real problem, and than use the 90 degree turn you take the friction problem out of the loop.
As a comparison, the Saab V6 engine is torqued to 1st 20Nm, 2nd 90dgree, 3rd 90dgree, 4th 90dgree
posted by 66.134.55...
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