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Re: Weird noises

To: "David" <dcrawfor@san.rr.com>, <healeys@autox.team.net>
Subject: Re: Weird noises
From: "Bob Spidell" <bspidell@comcast.net>
Date: Tue, 16 Aug 2005 07:07:12 -0700
I'm no O/D expert, but I know how it works.

When the O/D is not engaged, the cone clutch, annular gear, sun gear 
and planetary gears rotate as a unit; i.e. in effect it's a straight shaft.  
When the O/D is engaged, the sun gear is locked, the planetary gears
rotate about the sun gear and the annular (ring) gear is over-driven by
the planetary gears.  If you hear noise only when the O/D is engaged,
something is amiss in the moving parts; e.g. a chipped gear or similar.

There is also a "uni-directional clutch"--it's a roller clutch--whose purpose
is not exactly clear to me.  But I suspect if it was the cause of the noise
you would hear it whether the O/D was engaged or not.

BTW, can anybody explain how/what the uni-directional clutch is for?

bs
***************************************************************
Bob Spidell         San Jose, CA        bspidell@comcast.net
'67 Austin-Healey 3000             '56 Austin-Healey 100M
***************************************************************

Subject: Weird noises


> Esteemed Listers,
> 
> While diving my BN1 about 3,000/3,200rpm in overdrive, accelerating
> or on compression, I notice a rapid ratting - but like a playing card
> in
> the spokes of a bike. Not there in standard or in neutral.  An
> overdrive
> problem about to bite me you know where?
> 
> At first it sounded like a tach or speedo cable unwinding but I
> removed
> them to test and the noise, like the force, is still with me. I await
> your
> 'best guess' suggestions as I am really not sure what to do.  This
> needs to be fixed.  All responses most appreciated and answered.
> 
> Most ignorantly,
> 
> David C
> San Diego




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