[s-cars] (no subject)

[Cody Forbes]

The Bentley manual specifies a tolerance value for such cracks. I'm away 
from home otherwise I'd tell you what that value is. IIRC I think it's 1mm 
wide, but don't hold me to that. I do know that it says it's ok as long as 
it doesn't extend into the seat.

If the machine shop says it's ok I'd tend to trust them. In a perfect world 
you'd want a head with no cracks (the one on your car too lol), but 
sometimes perfection is unrealistic leaving you forced to except "pretty 
good" instead.

-Cody Forbes


djdawson2 at aol.com wrote:
> Calvin's point is a good one.? However, a crack from the plug bore to
> the valve seat is a very common and acceptable failure in the eyes of
> most rebuilders... very common in VW, Audi and BMW.
>
> I wouldn't see it as a major risk.
>
> Dave
>
>
> -----Original Message-----
> From: calvinlc at earthlink.net
> To: ELLIEOLSEN at aol.com; s-car-list at audifans.com
> Sent: Mon, 5 May 2008 3:45 pm
> Subject: Re: [s-cars] (no subject)
>
>
>
> Ummmm....having not rebuilt an Audi engine my opinion may be
> incorrect, but
> for all the engines Irebuild you definitely don't use a cracked
> cyclinder
> head.  These engines, although rare, are now "popping up" pretty
> regularly
> and I certainly wouldn't sacrifice an engine rebuild for lack of an
> un-cracked head.
>
> --Calvin
>
> -----Original Message-----
> From: s-car-list-bounces at audifans.com
> [mailto:s-car-list-bounces at audifans.com]On Behalf Of
> ELLIEOLSEN at aol.com
> Sent: Monday, May 05, 2008 12:57 PM
> To: s-car-list at audifans.com
> Subject: [s-cars] (no subject)
>
>
>
> The machine shop just called regarding my head, they say there is a
> crack
> from the spark plug down to the valve seat in cylinder 5. They also
> said
> that it
> was no big deal.
> What is your opinion?
>
> I know that cylinder heads develop cracks etc. should I be worried?
>
> Shawn
> Austin TX
>
>
>
>
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