[s-cars] Boost problem solved, same problem as last time - - - HELP!

[PAUL GAILUS]

I agree with Fred that it's likely an install issue
causing the key breakage.
Another more remote possibility is that the vibration
damper on the pulley is damaged or worn, allowing
torsional vibrations to stress the key and eventually
break it.

Paul


----- Original Message -----
From: Fred Munro <munrof at sympatico.ca>
To: 'Bruce' <brucem105 at comcast.net>; <s-car-list at audifans.com>
Sent: Tuesday, August 13, 2002 6:31 PM
Subject: RE: [s-cars] Boost problem solved, same problem as last time - - -
HELP!


> Hi Bruce;
>
> If this is the second time you've sheared the key on the crank pulley (I
> assume that is what you are describing), something is wrong. This is a
very
> rare occurrence on these engines and track usage will not increase the
> likelihood of it happening. The usual cause is improper installation of
the
> pulley. My guess is that your mechanic:
> 1. didn't torque the bolt enough and/or
> 2. didn't use locking compound on the bolt face and pulley face.
>
> This time tell him to use a new bolt as well.
>
>
> HTH
>
> Fred Munro
> '94 S4
>
>
> -----Original Message-----
> From: Bruce [SMTP:brucem105 at comcast.net]
> Sent: Tuesday, August 13, 2002 1:26 PM
> To: s-car-list at audifans.com
> Subject: [s-cars] Boost problem solved, same problem as last time - - -
> HELP!
>
> OK, so my mechanic knew where to look for the problem, since it happened
> before (although more severely last time). The front cog pulley that
drives
> the timing belt on the crank is broken yet again. F*ck!
>
> I guess with the track time I'm pulling, it's putting a lot of extra
stress
> on this area.
>
> So does anyone know where I can get a heavier duty timing belt drive
pulley
> on the crank? Or has anyone drilled through the gear and crank and
inserted
> pin(s) to strengthen it? Has anyone else even had this problem??
>
> Thanks all, as usual.
>
> Bruce
> '93 S4 with recurring problem and track events coming up!
>
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