[s-cars] Crank Bolt From Hell (lessons learned)

[Bruce Mendel]

I had the wonderful keyway experience twice...once at 120MPH full-throttle 
at VIR, and once at 135MPH full-throttle at Watkins Glen! It sheared off, 
car went into limp mode, no power at all and no boost. Cause turned out to 
be a bad harmonic balancer, allowing the assembly to vibrate and eventually 
get close enough to shear off the keyway.

Amazingly enough, both times I drove the car home from the track at low 
speeds, and with the excpetion of replacing the failed components, did no 
other engine damage. I love these AAN motors!

Bruce


----- Original Message ----- 
From: "Paul Heneghan" <paul.heneghan at bbc.co.uk>
To: <s-car-list at audifans.com>
Cc: "Fred Munro" <IMCEAMAILTO-munrof+40sympatico+2Eca at bbc.co.uk>
Sent: Tuesday, January 04, 2005 12:18 PM
Subject: RE: [s-cars] Crank Bolt From Hell (lessons learned)


Hello Fred & Co.

Should there be lubricant on the threads?  I thought it was supposed to
be assembled dry, with the Loctite there to ensure it doesn't vibrate
loose and also to stop rust due to water ingress?

Thoughts?

I had an old Avant about 10 years ago that needed a T-belt change.  I
didn't have the time to do it myself, so I gave it to the local shop.
About a year later, the car lost all power.  The engine would start, but
die whenever it was loaded.  I eventually traced it to retarded valve
timing.  This was caused by the key in the crank gear having sheared and
being ground into dust.  The 27mm bolt was only a little more than
finger tight - no sign of Loctite.  That's the last time I used a garage
for routine service work.

Paul
95 S6 Avant (UK spec)
96 S6 (UK spec)

-----Original Message-----
From: Fred Munro [mailto:munrof at sympatico.ca]
Sent: Monday, January 03, 2005 07:41 PM
To: Southerlin, Russell S; Tom Mullane
Cc: s-car-list at audifans.com
Subject: RE: [s-cars] Crank Bolt From Hell (lessons learned)

>Hi Russ;
>
>When you removed the bolt, did the threads have lubricant on them?
>Were there signs of locking compound under the bolt head or on the
threads?
>
>I use a 3/4" drive socket and breaker bar with a 6 foot pipe extension
for this job.

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