[s-cars] I got the dreaded call from the wife yesterday

[Marc Swanson]

Exhaust valves should be ok, they do not protrude enough into the 
cylinder to cause interference after belt slippage/breakage.



Tom Mullane wrote:
> $2-4k sounds like a lot of money for some gaskets and valves.  Figure $1k.
> 
> When the belt breaks, the cam stops, and whatever valves are open take
> a beating, but when the belt jumps, the cam continues turning with the
> crank, just a little late.  A little late means that the exhaust
> valves are still open when the piston gets to the top of the exhaust
> stroke.
> 
> Tom
> 
> On Mon, Aug 17, 2009 at 7:15 PM, Rich Dauenhauer<rdauenhauer at yahoo.com> wrote:
>> Tom nailed it. How it got behind the cam belt cover ??? but that is exactly
>> what happened I found once tearing down the front end. O compression in all
>> holes! :(
>> Tom what makes you think EX valves are also bent? Past experience? She still
>> claims this was low speed. so now the dilemma ...to fix or not. 2-4K when
>> all done approaches the value of the car. at this point wouldn't  I be
>> better of with a replacement motor?
>>
>> --- On Mon, 8/17/09, Tom Mullane <tmullane at gmail.com> wrote:
>>
>> From: Tom Mullane <tmullane at gmail.com>
>> Subject: RE: I got the dreaded call from the wife yesterday
>> To: rdauenhauer at yahoo.com
>> Cc: s-car-list at audifans.com
>> Date: Monday, August 17, 2009, 1:45 PM
>>
>> As much as I hate to throw a wet blanket on this, I suspect that at
>> least some of the exhaust valves are bent.
>>
>> When the serp belt shreads, it can get twisted behind the crank pulley
>> and displace the belt.  I'm pretty sure that is why the car stopped.
>> I'd use the tool, but I'd just toss a belt only on the car and do a
>> leak down test.  I doubt that a simple timing belt is going to fix
>> this one.
>>
>> Tom
>>
>>
>>
>>
>> Message: 1
>> Date: Sat, 15 Aug 2009 17:42:59 -0700 (PDT)
>> From: Rich Dauenhauer <rdauenhauer at yahoo.com>
>> Subject: Re: [s-cars] S-CAR-List Digest, Vol 70, Issue 28
>> To: s-car-list at audifans.com
>> Message-ID: <128951.39844.qm at web112515.mail.gq1.yahoo.com>
>> Content-Type: text/plain; charset=iso-8859-1
>>
>> Greetings all well I got the dreaded call from the wife yesterday: "
>> The car started making this funny noise then just quit".? Further
>> protracted inquiry revealed that she heard a plastic scraping noise
>> for a MILE or TWO beforehand. Worst fears were confirmed when she
>> described belt material tangled around the front shroud and fan area.
>> Knowing the car (95.5 S6 Avant) is an interference motor? I started
>> drinking immediately and instructed her to call AAA and get it back to
>> the house.
>> On my way home I picked up a Timing belt anticipating at least a
>> leakdown to determine if valve/piston smackage was going to put damper
>> on the WE and severe dent in my wallet.
>>
>> This morn I started tearing into it and first off the Serp. belt had let go
>> ..
>> Pulling the upper Cam gear cvr I expected to find the wort but was
>> relieved to find the timing belt intact....barely! It was chewed to
>> sh*t but looks to have survived??
>>
>> So the question: Can I do the belt replacements w/o the special tools
>> outlined in the Bentley? How?
>>
>> Thanks
>> Rich ?
>>
>>
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-- 
-----------------------------
Marc Swanson
M Swanson Consulting LLC

Email:  mswanson at mswanson.com
Phone:  (603)413-6833
Cell:   (603)512-1267
Fax:    (603)316-0372

http://www.mswanson.com