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?

 

Yours are second design (after 99), Summit says 85.

 

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.

 

47 ft. lbs and send it.

 

How did you come up with this number ?

 

I have seen several comments here and there that say to just forget about the angle method when reusing rod bolts on these engines. anywhere from 43 to 50 ft lbs. I think that is the route I am going to take.

 

So would the 43-50 ft/lbs work for reusing rod bolts on all gen 3/4 style connecting rods then ?

 

The trusty Snap On ATECH3FR300B says my stock rods after 15 ft lbs and 75 degrees were 47-49 ft/lbs. After the final angle, the wrench indicates actual torque.

Che70velle is on it.

 

My battery compartment corroded, so my super expensive SnapOn torque angle wrench no longer works. Rub salt in the wound, *******, lol.

 

Ended up 15 ft lbs, 30 ft lbs, and finished up at 47 ft lbs.
Bolt felt good through the wrench finishing at 47 ft lbs.

Thanks for the feedback!

 

75 or 85 really just means 90. Make it easy.

 

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.

 

This. Digital SnapOn Atech takes all the guesswork out. I tinker a lot.