[Healeys] Ring gear not fully seated in flywheel

[Alan Seigrist]

Michael -

The ring gear is a pretty simple device with a very low loading and very
little use... with several hundred teeth and only a half second of use,
typically, the chance the ring gear failing due to improper heat treatment
is very low.

The synchro rings, however, are very different.  Not only are they
subjected to constant and repeated stress, the brass itself is a soft metal
that is put in the position of having to function through significant
amounts of friction.  In this regard heat treatment is critical.

Cheers,

Alan

On Wed, Jan 21, 2015 at 1:01 AM, Michael Salter <michaelsalter at gmail.com>
wrote:

> I have found the comments on this topic to be very interesting with
> regards to the heating of the ring gear. I am no metallurgist so I tend to
> pay attention to manufacturers instructions regarding the heating of metal
> components very carefully.
> In the BN1 workshop manual instructions are given for shrink fitting new
> brass syncro cones onto the gears. The instructions read:
> *"The heating (of the syncro ring) can best be done by immersion in oil of
> 250 degrees Fahrenheit and then fitting by means of a hand press. After
> shrinking on, the unit should be immediately be quenched in water to
> prevent the heat softening the gear itself.*
> 250 degrees Fahrenheit is the equivalent of 121 degrees Centigrade.
> Well, if we are going to be heating the actual RING GEAR to 2 or 300
> degrees Centigrade should we not perhaps be a tad concerned about heat
> softening the ring gear??
> Just a thought....
>
> Michael S
> BN1 #174
>
>
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