Here's a materials question related to the timing belt procedure...
#1
AudiWorld Super User
Thread Starter
Here's a materials question related to the timing belt procedure...
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...
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...
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#8
Yes you can calculate it
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...
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...
#9
AudiWorld Super User
Thread Starter
If I did have the TPI and tensile strength, and assume a lubed bolt, how do I calculate it?
Somewhere at home I have a barely opened Machinery's Handbook, maybe it's in there.