Brian,
Is it possible the transmission bolts that bolt the bellhousing to the
engine were loose at some point in time, causing the elongated holes?
I suspect the worn input shaft bearing was caused by misalignment of the
transmission and engine; and the misalignment was caused by the elongated
bellhousing bolt holes.
Terry Geiger
'74 Triumph TR6 | '63 Triumph Herald | '70 MGBGT | '84 Mercedes 300D Turbo
Diesel
http://www.shoalsbritishcars.org/
----- Original Message -----
From: "Lanoway, Brian" <Brian_Lanoway@standardaero.com>
To: "Triumphs Digest" <triumphs@autox.team.net>
Sent: Friday, February 09, 2007 2:30 PM
Subject: [TR] TR6 throw out bearing squeal
>I was suffering from the notorious TR6 clutch release bearing squeal - that
> machining-like squeal that occurs when you first touch the clutch pedal.
> Everyone on the web seems to focus on the release bearing itself as the
> cause
> of the squeal and there has been much written about the different styles
> of
> bearings available (OEM equivalent and the larger Koyo bearing) - with the
> conclusion by some that all of them are crap and will eventually squeal.
>
> When I pulled my tranny, I found that my standard-sized release bearing
> and
> the fingers on the B&B pressure plate were just fine, there was no
> evidence of
> wear at all (both were replaced two years ago and have less than 4,000
> miles
> on them). Further exploration revealed a worn pilot bush in the
> flywheel -
> with quite a step in the ID.
>
> I then did a lot more research on web and found an article by Brent Kiser
> and
> Tom Fremont. Brent swore that the after market clutch covers are all
> inferior
> to the original Laycock. Tom had a more interesting idea: he said that
> the
> mounting holes in the aluminum bell housing elongate after multiple tranny
> removals and this causes the center of the transmission input shaft to
> drop
> and no-longer spin at the same center as the flywheel bush.
>
> I then had a good look then at my bell housing and almost all the mounting
> holes are severely elongated. All this now makes sense. My local
> transmission shop swears that a worn pilot bush will also result in this
> kind
> of squeal.
>
> Has anyone else encountered and fixed this (assuming that the mismatch in
> rotating centers is the cause of the squeal)? Has anyone on the list
> repaired
> and remachined the mounting holes in their tranny bell housing to get
> things
> re-centered again? Or does anyone know where I can get a replacement bell
> housing with good mounting holes - or gawd forbid - they must be
> expensive, a
> new bell housing?
>
> Brian Lanoway
> 1973 TR6
> Winnipeg, Canada (where it's still minus 27C today!)
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