[s-cars] B6 S4 4.2l engine vibration

[mike schowengerdt]

cody,

that sounds logical to me, but if you haven't yet then inspect that harmonic 
balancer very carefully for rotational slippage at the bonding and also for 
looseness to the crank.....also the ps pump and ac compressor drive......the 
next would be trans r&r for clutch inspection......and remember, they charge for 
exploritory surgery the same as corrective surgery .........good luck and let me 
know what you find, i have not run into this personally but have heard of a lot 
of clutch repairs to this model, due to operator abuse or design/execution i 
don't know..........................m


________________________________
From: John Cody Forbes <cody at 5000tq.com>
To: audifans <quattro at audifans.com>; s-car-list at audifans.com
Sent: Thu, November 11, 2010 11:01:16 PM
Subject: [s-cars] B6 S4 4.2l engine vibration

Got an S4 in the shop today with a __horrible__ vibration. It is 100% engine 
related, is not effected by clutch position nor road speed. Noticeable at idle 
and get worse as you increase revs, so much so that I am afraid to take it 
beyond 2000rpm. It is not a misfire, engine runs well. No CEL. Everything on the 
front of the engine looks ok, harmonic balancer runs true, etc.

The only thing I can think of is that the dual mass flywheel center bearing let 
go and the clutch side of the flywheel is off center. Obviously the cost of 
being wrong about that is significant.

Any ideas/input/btdt?

-Cody (mobile)
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