[s-cars] Size of crank bolt - was: Special Tools -- Timing Belt Replacement -- 94 urS4

[Paul Heneghan]

> Once you see a picture of spanner 2079 you can probably build it using
scrap
> metal and 36mm socket.
>
> David G.
> (I hope I got the 36mm size right)

I seem to recall the crank bolt having a 27 mm head.

It can take a LOT of torque to undo it. Last T-belt job I did, I was
dangling off the end of a six-foot scaffold tube and that didn't shift it. I
had to start bouncing up and down before the bolt finally came undone (with
a frightening bang) - I reckon it must have been close to 2000 Nm of undoing
torque.

Just found another pdf about T-belt on I5 engines - slightly different from
the AAN engines in urS4 and urS6, but still very useful:
http://s2central.net/Timing_Belt_Renewal_Rev1.pdf

There is considerable difference of opinion as to whether to use
threadlocker on the bolt. The Bentley says to use sealing paste AMV 188 001
02 on the threads and contact surfaces of the head. I think this is more to
prevent corrosion than to actually lock the bolt in place. I use a small
amount of red RTV gasket maker on the last few mm of the thread nearest the
head that are actually used and put a bit on the contact surface of the head
as well.

Could do with some feedback from OP as to whether any of this is any use or
not?

Paul

------------------------------

Message: 2
Date: Sat, 31 Mar 2012 11:56:27 -0700
From: "David Giannandrea" <david.giannandrea at sbcglobal.net>
To: <s-car-list at audifans.com>
Subject: Re: [s-cars] Special Tools -- Timing Belt Replacement -- 94
	urS4
Message-ID:
	<006f01cd0f6f$faaab390$f0001ab0$@giannandrea at sbcglobal.net>
Content-Type: text/plain;	charset="us-ascii"

Spanner 2079 is simply an extension (torq multiplier) so you don't have to
buy 1" drive stuff.

I recall a writeup 4-5 years ago where these tools were substituted with 2"
square tubing and a pipe wrench.

The author used about 4" of 2" square steel tubing (with a couple cutouts to
engage the shoulders inside the vibration damper).  Put 36mm socket on bolt,
insert square tube to engage vibration damper shoulders, counter hold with
huge pipe wrench, loosen bolt with similarly huge breaker bar.

You get the idea. Weld/cut as necessary. The key to this solution is that 2"
square tubing happens to fit the vibration damper.

Once you see a picture of spanner 2079 you can probably build it using scrap
metal and 36mm socket.

David G.
(I hope I got the 36mm size right)