Re: stripped tensioner bolt hole

M9 is probably pretty scarce, you'd likely have to do a 10mm.  Other options would be an SAE size that's in between, but that'd be 1/4" which is actually slightly larger than 10mm.  Only other options I can think of is an insert or clean the hole well and use a thread re-builder epoxy.  McMaster Carr has some thin wall inserts that don't require a huge bore-out.
    Loren



-----Original Message-----
From: Rolf Pechukas <[email protected]>
To: Chris Geiser <[email protected]>; vwdiesel <[email protected]>
Sent: Tue, Apr 14, 2015 10:45 am
Subject: Re: [Vwdiesel] stripped tensioner bolt hole


good idea, but I think these are not thru-holes (will double-check - not 
at the
car now)

stock bolt is m8x70, with a cone tip - thinking tap for m9 and try to

find one locally?


On 4/14/15 12:45 PM, Chris Geiser wrote:
>
> I don't
remember if there's room, but can you get a little longer bolt 
> and get a nut
on the end?
>
> CG
>
> On Apr 14, 2015 11:40 AM, "Rolf Pechukas" <[email protected]

> <mailto:[email protected]>> wrote:
>
>     hi all
>
>     2001 Golf TDi [ALH]
>
>
trying to re-install serpentine belt tensioner after an alternator
>    
replacement
>
>     2 bolts are good (the 2 shorties), but the long one won't
snug up
>
>     stripped threads in the aluminum carrier arm
>
>     (not sure
how this happened - garage recently serviced serp belt -
>     someone may have
used an impact wrench? I'm always very gingerly
>     around aluminum, ever
since my son and I had to put steel inserts
>     in the block of his '97 Z3 b/c
the head bolts wouldn't torque)
>
>     thoughts? tap for larger bolt? other
ideas?
>
>     aluminum sucks
>
>     thanks
>
>     Rolf in MA
>    
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