Bolt torque

[Dave K.]

Al is right.  I have heard one story of a balancer coming loose but there is
no way it could have been tightened with a big bar like the method
suggested.
I have personally done three 20v TB changes using my fat ass at the end of a
4' bar to tighten the bolt.  All are still going strong.
and of course I had (at least) a beer after each one.

Dave K.
'90 CQ - getting a 3B in 2004
'91 200TQ - nothing left but a few bits...


----- Original Message ----- 
From: "Al Powell" <apowell at gocougs.wsu.edu>
To: <bob.kunz at hp.com>
Cc: "Q-List" <quattro at audifans.com>
Sent: Sunday, November 30, 2003 7:46 PM
Subject: Bolt torque


> Bob asked:
> From: "KUNZ,BOB (HP-Boise,ex1)" <bob.kunz at hp.com>
>
> OK, guys. I've looked for the actual torque on this bolt and have found so
> far...
>
> 330 ft-lbs at the bolt
> 450 ft-lbs at the bolt
> 400 ft-lbs at the bolt
> 258 ft-lbs at the end of the 2079 tool
>
> So, anybody have the actual torque for this bolt?
> --bob
>
> Bob, I had the same question about the bolt torque when doing my timing
belt
> on my 1990 200.  As I recall, the torque figure I finally came up with
after
> some good samaritans shared it with me was about 340-360 lbs/ft or
something
> in that area.  This was a whole lot more than any conventional torque
wrench
> can measure, and I suspect that the only reason they use tool
> whatchamacallit is to reduce the torque to a number that torque wrenches
> available to most mechanics can actually deal with. So here's what I did:
>
> 1) I got a socket to match the bolt, and put a 1/2" breaker bar on it;
> 2) I bought four feet of 1/2" pipe, just the right diameter to slip over
the
> breaker bar;
> 3) Standing beside the car, I then used my finely calibrated forearms and
> sublime physique to apply approximately 85 pounds of push on the bolt.
> Remember, 10 pounds of force at 1 foot from the center of turn (10
> foot-pounds) is 40 foot-pounds when applied four feet from the center of
> turn.  4 x 85 = 340 lbs/foot, and who gives a rat's ass about the
> difference??????
>
> And my 200 is still running nicely some years after this kentucky-windage
> technique was used.
>
> Here's the deal: if you're tightening a bolt that takes 40 lbs/ft of
force,
> then 10 pounds either way is a 25% error and could be significant.  But
> let's all get a life here - - - when you're dealing with 350 foot-pounds,
> what difference does 20, 30 or even 50 foot-pounds either way matter?????
> If the stinkin' bolt is tight at 350, it will still be tight at 320.  it
> will still be tight at 380. It probably won't fall out if it's only
> tightened to 300, and it probably won't twist off if it's tightened to
400.
> So I figured that my procedure would yield results well within the range
> that I fondly call "close enough"...and it did.
>
> So my vote is to get out the four foot length of pipe, cinch the sucker
down
> till YOU think it's good, and go have a beer.
>
> ************************************
> Al Powell
> apowell at gocougs.wsu.edu
> 1958 Fiat 1200 Transformabile Spyder
> 1983 Datsun 280ZX Turbo
> 1993 Audi 90Q
> 1997 Chebby Blazer
> 1999 Chebby Blazer
> ************************************
>
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