Randy, the first motion shafts are not interchangable. The bearing
sizes are completely different and you can not install one in place
of the other.
David Nock
British Car Specialists
Stockton Ca 95205
209-948-8767
www.britishcarspecialists.com
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.
On Apr 18, 2009, at 5:36 PM, randy dickson wrote:
> Fellow Healeyoids,
> I'm having trouble identifying which is the correct first motion
> shaft. I
> have two complete gearboxes plus lots of other parts. It has been
> awhile
> since I assembled a gearbox so I want to know which first motion
> shaft goes
> with my BJ7 box. I think that it is the AEC 3472 first motion
> shaft. I
> know that the BJ8 first motion and main shaft are different. The
> other
> first motion shaft is a 22 B140 (BJ8???). It appears that on the
> BJ7, the
> bearings (18) that accompany the first motion shaft are longer, and
> different than the BJ8 box. I've got the BJ7 box mostly together
> now with
> the first motion shaft installed. I just want to double check,
> that I have
> correct first motion shaft installed. Endfloat on the laygear is
> between
> .007-.0016. I read that .0012 is the limit, but the end of the
> laygear is
> not perfectly even (thanks to the machine shop). The front of the box
> contains the much larger bushing. Shouldn't the real thrust be
> toward the
> large end anyway? I wonder how long the gearbox will last with a
> larger
> endfloat? Is it just noisier or does it fail quicker. Thanks!
>
> Randy
> Healey-Archaeologist
> 63 BJ7
> 60 BT7
> 66 Cobra replica
> 06 Mini cooper S
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