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
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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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