Crank bolt torque for timing belt change (10v)

[SJ]

Those responding to this thread are simply puzzled because the numbers dont
add up.
If you break the problem down to the basics and do the math, you end up with
500+ ft lbs of torque on the bolt. Yet the specs indicate less than 400.
Either we messed up on our High School Physics theory . .or . .the audi tool
is not 12" long.

Anyone know a physics professor?

The reason for my interest is that I want to make an audi tool look alike.
However, my torque wrench does not go to 258 ft lbs. The way around that is
to make the "extension tool" longer.

To make your own "El Cheapo" extension tool, all you need is a steel pipe:
- One end has a small thru bolt to position the pipe accurately on a 1"
drive breaker bar(hole drilled thru handle to accept the positioning bolt).
- On the other end of the pipe, you weld in any 3/4" drive socket  . . the
3/4" end of the socket clear.
If you want it real accurate, you would drill a hole in the pipe to accept
the socket . .and weld it flush to the outside surface of the pipe. Now you
wont have any torquing moment around the pipe.
The combination of breaker bar and pipe will give you whatever length of
extension you need.

To use:
1. Install the correct socket on the 1" breaker bar
2. Position the "Pipe extension" tool on the breaker bar and lock in
position with the bolt.
3. Snap your torque wrench into the welded 3/4" socket on the other end of
the pipe.
4. Set the torque wrench for the calculated value corresponding to the bolt
torque required.

And away you go!

Now, if only I could figure out the theory and formula so I can make this
bloody thing!

Somebody help meeeeeeeeeeeeeeeeeeeee  !!!!!!!!!!!!!!!!

SJ
85 Dodge PU, D-250, 318, auto
85 Audi 4k - - sold but still on the road
88 Audi 5kq
90 Audi 100q


> From: Kneale Brownson <knotnook at traverse.com>
> Subject: Re: Crank bolt torque for timing belt change (10v)
> To: antar at comcast.net, quattro at audifans.com
> Message-ID: <4.1.20031201081221.017add20 at pop.traverse.net>
> Content-Type: text/plain; charset="us-ascii"
>
> I thought a torque wrench applied a measured amount of torque TO THE
SQUARE
> DRIVE PART of its assembly????
>
> If you put a 258 ft. lb. torque setting on a torque wrench five feet long
> or one foot long and make it click, you've applied 258 ft. lb. of torque
to
> the square drive fixture.  The Audi tool is designed so that when you
> supply the desired torque to the hole in its end, you've applied the
> correct torque to the nut on the crankshaft.
>
> At 06:09 AM 12/1/2003 -0500, Ameer Antar wrote:
> >I'm not sure why I bother, but shouldn't the torque actually be a lot
more
> >than that? If you use the tool and you're putting 258 ft-lbs on the
> >t-wrench, then for simplifiying the numbers you can assume the t-wrench
is
> >exactly 1-foot and you're putting 258 lbs at the end of it. (You could
make
> >the t-wrench 30 inches, but it's the same thing, you just need a
different
> >weight to match the 158 ft-lbs). So then you are also adding another foot
of
> >extension, so the new torque should be something like 258 lbs * 2 ft =
516
> >ft-lbs. Torque is simply the weight applied to the bar or wrench times
the
> >distance from the bolt center to the point where you apply the weight. I
> >doubt you'd need to torque it that high to be safe, but it seems like
that's
> >what Audi wanted you to do.