quimbysr

OK guys, I'm in the middle of replacing the balancer on my 05. I was just doing a stock replacement with the stock bolt (couldn't get an ARP bolt here in under 3 weeks and this was the long weekend where I'd have time). I was doing the 37 lb-ft + 140 degrees and reached 236 lb-ft at bout 60 deg using the torque dial I got (so I thought). When I got to about 120 deg, I pulled the setup off to just take a peek at the mark and I was really at about 200 degrees.

So, do I need to pull the bolt and start over with a new one or am I OK to just leave it?

Thanks
V/R
Bill

xBoostx

Hope you are not reusing the old bolt it will come loose, if you got it to 240 lbs torque you are good just as long as you are using a new bolt.

quimbysr

Definitely used a new bolt, and have another one coming to the parts store tomorrow, I'm just not sure if I stretched it to the point of weakening the bolt. I'd prefer to just leave it in there.

HK770

https://www.ebay.com/sch/i.html?_odk...guage&_sacat=0

xBoostx

Leave it in there did you clean the mating surface oil before you install the bolt so it could hold.

quimbysr

Yeah, HK770, that's basically what I tried to use. I think it will just be Sharpie marks next time.

hubes

I'm not sure what the spec is, but if you're saying you went 80* too far I would replace it for piece of mind, that's quite a bit of extra stretch. I believe those bolts are torque to yield which is why they are one time use

quimbysr

Thanks, Hubes and everyone else). I ended up pulling it out of there. I calculated that I had stretched it 142% of the spec. You can see that it's ever so slightly longer than the original, which is ever so slightly longer than the brand new one I have now. I did search around for a stress-strain curve for whatever steel a 10.9 bolt is made of since I figured I may be OK if I was still on the up side, but no one seems to publish those. It makes having an engineering degree useless to my hobbies!

Apocolipse

If its in plastic deformation its reached pretty much max clamp.