kday

Lacking both a torque wrench that goes up to 350+ ft.lbs, and the additional leverage of the special Audi tool to tighten the crank bolt, we approximated. Is it possible to calculate the effective torque of 150 ft.lbs plus 70 degrees, given the bolt grade (12.9)?

150 ft.lbs is the limit of my torque wrench, and + 70 degrees was the point where my breaker bar was bending noticeably more than it did while undoing the bolt. There was blue loctite on the bolt at the time, which may have started to set, so that probably complicates things...

yodasfro

I haven't had problem with only using 250 ft.lbs

4Driver4

Really, really tight.

4Driver4

If the bolt is too loose, it will stress the key in the crank sprocket and crack or sheer it.

SilberUrS6

Guten teit.

Turbo_Anarchy

Tighter than the hubs of Hell

chefbob

^^^^not after I was done with ya ;p

450exc115

But you need to know the threads per inch and look up the tensile strenght of the bolt. Not to mention if you used lube as to assertain the torque loss due to friction..

One way to do it is take your body mass (say 150lbs) and stand on the wrench at the approiate spot. So if you need 350ftlbs then stand at 350/150= 2'4"s

Oh and i have NO clue what that bolt holds on that requires that much torque...

kday

Somewhere at home I have a barely opened Machinery's Handbook, maybe it's in there.

SilberUrS6

I think "hung like a squirrel" is appropriate in your case...