Re: thumping in rear end of UrQ

["John Corbishley" <gtr1@traverse.com>]

I had the rear hanger go on my '83, and could see where the exhaust had been
rubbing on the inner CV joint where it passes over the rear axle.

I thought that this had solved my problem with strange noises like wooden
balls knocking together (carpet bowls Phil) coming from the rear,
particularly when getting under way in the morning.  Dissapated as the car
warmed up.  The weird thing is that it seems to have gone away this winter??
I have been thinking prop-shaft bearing or CV joint, but cannot see anything
obviously wrong.

John Corbs
TC, MI
'83 & '85 Ur-Qs
-----Original Message-----
From: John Karasaki <johkar@teleport.com>
To: Phil Payne <quk@isham-research.demon.co.uk>; mx@snet.net <mx@snet.net>
Cc: urquattro@surfree.net <urquattro@surfree.net>; quattro@coimbra.ans.net
<quattro@coimbra.ans.net>
Date: Wednesday, January 20, 1999 5:59 PM
Subject: Re: thumping in rear end of UrQ


>Been there, have that.  Only get rubbing if it is raining or if there is
>water on the road!
>
>
>
>
>At 06:25 PM 1/20/99 GMT, Phil Payne wrote:
>>Michael Williams wrote:
>>>
>>> hey all, im worried now.  I was just driving my UrQ home, and took a few
>>> turns spiritedly when i noticed that something was thumping
>>> intermittently.  Well, i thought it might be the exhaust or something,
>>> but then it became regular very quickly.  When i pulled onto my street i
>>> turned off the car and let it coast to a stop, it was there, a
>>> thump-thump-thump, not over bumps, but consistently, with the delay
>>> lengthening as the speed dropped.  It didnt seem to change much when i
>>> put on the brakes that i can remember.
>>
>>I remembered something else this might be - differential exhaust
>>cooling.
>>
>>At one time, it used to happen to mine.  You need cold rain or slush
>>on the road - the way the airflow under the car works leads to one side
>>of the centre exhaust section being cooled more than the other, and the
>>exhaust twists into the prop shaft.  If you let it cool down, the
>>problem goes away.  Symptom is a bright spot on top of the exhaust
>>pipe - fix is to re-align the exhaust.
>>
>>--
>> Phil Payne
>> Phone: 0385 302803   Fax: 01536 723021
>> (The contents of this post will _NOT_ appear in the UK Newsletter.)
>>
>>
>Best Regards,
>
>John Karasaki
>Portland, OR
>