Re: belt quest

["Fred Munro" <munrof@isys.ca>]

Phil;

    Check the fit of the belt in your pulleys. If it rides too high (>1/4 of
depth above the pulley rim), you won't have enough surface area to transfer
the power and the belt will squeal and wear. However, it is generally better
to have the belt sitting high than low - if it is high, it may wear in and
sit lower, but if it is low, with a bit of wear it bottoms out in the pulley
and transfers practically no power. The angle on the sides of the belt must
match that on the pulleys, or a belt which appears to fit OK may quickly
wear down to the point where it bottoms out. It is the sides of the v-belt
which transfer power, not the bottom surface.

Fred Munro
'91 200q  257k km
-----Original Message-----
From: Phil & Judy Rose <pjrose@servtech.com>
To: quattro@coimbra.ans.net <quattro@coimbra.ans.net>
Date: Thursday, September 03, 1998 7:24 PM
Subject: belt quest


>Huw and I recently described our dissatisfaction with the fit of certain
>v-belts on our Audis. In my case, it's the hydraulic pump's belt which
>seems too narrow and is a bit twisted. Today I stopped at a nearby Bosch
>parts supply and bought the belt they had listed for the '91 200q hydraulic
>pump. They sold me a Contitech belt (made in Germany) that is 13 X 996.
>
>However, when I checked the manual and the Bentley, the belt is specified
>to be 12.5 X 960.  The old belt appears to be 12mm (it possibly could have
>been 12.5 when new, but I can't see any dimensions printed on it).
>
>Anyone know if the longer, wider size is actually appropriate here? The new
>belt's extra length would partly be taken up by the fact that the belt
>would ride higher in the pulleys. I might need to adjust for 0.5" extra
>distance (pulley-to-pulley).
>
>Phil R.
>
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