[Healeys] Diff again

[Eric (Rick) Wilkins]

My very limited understanding is that the important part is the amount  
of backlash, and the contact pattern. Worn bearing will affect the  
backlash or "Play" which may allow the contact pattern to shift out of  
the acceptable range.

Wilko

On Jan 22, 2011, at 11:53 AM, Austin Healey wrote:

> Greetings Mates,
>
> I am still preparing for the diff rebuild.
> I have disscussed the task on a couple of forums and with different
> specialist-looking people personaly. Unfortunatly still not  
> enlightened
> enough.
>
> My main problems lie by the pinion position.
>
> - the factory workshop manual tells me to use a special tool for
> positioning. Unfortunalty I dont have this item - and if I am righ,  
> it is
> not available any more.
>
> - it would also be nice to know the exact distance from the  
> differential
> axle to the pinion top - but I have not found any source for this  
> kind of
> data
>
> - as an alternative method, many sources recommend to measure and  
> fix the
> existing pinion height, and to bring the pinion back there after  
> replacing
> the bearing. Clear as springwater. I have made some plans for a  
> simple tool
> which would make it easy to achieve. BUT I moved on thinking about the
> subject, and I find this not problemfree. As the bearings now in my  
> diff are
> quite well worn (after 50+ years) they must bring thurder away the  
> pinion
> from the factory spec. Is it worth bothering with the pinion height,  
> or
> better to install the new bearings, set preload, backlash etc, and  
> check the
> contact pattern with a contact compound (and reposition the pinion if
> needed)? Or bearing wear does not alter pinion height by much?
>
> Please if possible teach me.
>
> Greetings:
> Gergo
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