[urq] subframe mount bolts

[mike schowengerdt]

agreed, helicoil is the best repair, no breech of chassis...will require removal of subframe for access, special helicoil tap and insert required, a little tricky since the captive nut can move around a little (iirc), still much easier and sanitary than the alternative


----- Original Message ----
From: "Schaible, David" <David.Schaible at jrspharma.com>
To: SpotatAshleys <spotatashleys at hotmail.com>; urq at audifans.com
Sent: Tuesday, September 12, 2006 2:39:15 PM
Subject: Re: [urq] subframe mount bolts


This happened to me on my 20v avant........i believe the audi sanctioned
repair is to cut it open and weld it back.  I chose to use a helicoil
insert and took a verbal beating on the list for it.  After further
investigation and talking to some airplane mechanics I was even more
sure of the fix.  I have beaten that auto like a rented mule since and
the fix has held......i'm thinking that was about three years ago
(~60-75k miles).

Make sure you use a factory bolt!  

I don't know if there are different size subframe bolts to "go up a
size" ask a pro wrench or waste some time in the family album.



-----Original Message-----
From: SpotatAshleys [mailto:spotatashleys at hotmail.com] 
Sent: Tuesday, September 12, 2006 2:27 PM
To: urq at audifans.com
Subject: [urq] subframe mount bolts

Evening All

I have not posted on here for a long while due to a house move and
having no computer set up until now.
I've just finished quick change of starter motor (old one - only 2 yrs
old after-market, non-Bosch rubbish - fell to bits) and whilst having a
check around underneath found that the rearmost left subframe mounting
bolt (nearest to where the exhaust exits) has stripped it's thread in
the little stalactite-like "turret".
My question is:
As the thread has stripped rather than the captive nut becoming detached
and spinning around, is it possible to re-cut a slightly larger thread
and use a slightly larger bolt to suit? If so has anyone done this and
again, if so, what thread/bolt size was used?

I guess if the above is not possible then there is no alternative to
opening one side of the "turret" and somehow securing a new bolt in
there of the correct size and then sealing it up.
If the latter route has to be taken is it OK welding down there given
the proximity of fuel lines etc or do I need to remove the tank etc?

Are there any alternatives to the above?

Look forward to any suggestions you may have.
Many thanks

Keith

'87 WR (in rare and unpopular Nile Green but I love it)
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