orin@drizzle.com, audi@humanspeakers.com, quattro@isham-research.com, syljay@optonline.net

[Gregory Megara]

This torque wrench discussion, I'm afraid is going to drop off the list with too many people confused. 
I just need to get a few things off my chest, so bear with me. :)

Whatever the Bentley manual claims to be the torque needed WITH the 2079 tool, the only way that is valid is with the exact torque wrench that the Bentley manual tells you to use. Once you change to a different torque wrench (and probably a different size at the same time) the whole torque setting is out the window, and you need to start playing with the torque conversion equations.

If the Bentley manual tells you the torque needed AT the crank shaft bolt, and then says you need to use the 2079 tool, then that means you are going to need to do a torque conversion anyway. 

If someone would quote the manual I could get a feel for the verbage of the what is really necessary. I will look this up in my Bentley manual 1.8t 99.5 a4 and see if this tool is mentioned and how so.



Now Orin, our equations are the same, I just have mine equal to the converted torque wrench setting, and yours is equal to the torque needed at the bolt. I just derived mine on paper, and thus made it relevent to the discussion by making the whole deal equal to the number that we are all so desperately searching for.

I just saw on the list a mention that if you change the size of the torque wrench it will not torque at the setting on the wrench. THIS IS WRONG, in a way. The only thing that will change is you will have to pull/ push harder if the wrench is shortened, or less if it is lengthened. BUT---BUT, if you have the 2079 tool attached, changing the size of the torque wrench will affect the torqe at the bolt--- just look at the torque conversion equation.

I don't know how to make it any clearer. The way a torque wrench works is at the drive - 1/4", 1/2" , 3/4", or whatever square nub that the socket is placed. There is a spring that is tightened or loosened that works that click --- at the drive. That will not change if you shorten or lengthen the torque wrench!!!


Anyway, if you have the both the specified torque wrench, and the specified 2079 tool, chances are the torque value given is the one you set on the torque wrench (they wouldn't make you spend several days on an email list trying to figure out the conversions....).

Phil, ok, I was just going by someone elses numbers, so use 332 ft-lbs instead of 258 ft-lbs for value "NT". I am not disputing #'s here, just what you need to do in order to go about using different tools than the Bentley manual states.

TW = (NT * LT) / (LT + L2079) 

TW = torque wrench setting (after conversion----final setting!!!)
NT = torque required at crank nut 
LT = length of torque wrench
L2079 = length of 2079 tool


What is relevant is if the Bentley manual states either value TW or value NT and the circumstances behind that.

>From now on, I think I will let it rest on the list like this, email me if you want to discuss any of this further.