75 or 85 degrees
Thread Starter
TECH Apprentice
Joined: Aug 2009
Posts: 302
Likes: 123
From: Louisiana
75 or 85 degrees 2005 LQ4 factory rod bolt tightening. I have some books that say 15 pound feet torque plus 75 degrees and then i see other info that says 85 degrees. Comments?
My comment is that if a 10* change in torque angle is ever noticeable, your parts are WAY too close to being on the ragged edge of quality specifications. Such a minor difference should only matter to people who are pushing their parts to the absolute limits.
Thread Starter
TECH Apprentice
Joined: Aug 2009
Posts: 302
Likes: 123
From: Louisiana
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Verdad Gallardo My battery compartment corroded, so my super expensive SnapOn torque angle wrench no longer works. Rub salt in the wound, *******, lol.
The initial torque is to draw all the parts together so there is no more slop. The turn angle is to achieve the same bolt stretch regardless of friction so all the bolts achieve a tighter variation of clamping load (this is desirable). Friction under the bolt head has a HUGE effect on final stretch and clamping load (friction of threads is much smaller effect). And I'm not just talking about oil, even material and surface coatings matter. Point is, the tightening specs are designed to keep the variation of clamping load tight which is important considering the application. It's not so important for other things but it is important for rods.
