[Healeys] Differential vs BN2 OVERDRIVE

[Michael Salter]

Quite correct Bob,
However I believe the premature failure of the laygear needle bearings is
caused by circulation of the microscopic chips of hardened steel that are
shed by the 1st, reverse and laygear when people grind them together.
To minimize this I always install a magnet on the gearbox drain plug to
supplement the overdrive one.
I have been restoring (replacing) the 1st gear section of MG "T" series
gearboxes for several years for which we have been using a tougher steel
alloy for the replacement 1st gear. To date have experienced no failures,
even in boxes that have been raced extensively.
I would presume that the people doing the Healey laygears are using
similar  material.

M

On Thu, Mar 5, 2020 at 6:26 PM Bob Spidell <bspidell at comcast.net> wrote:

> Don't forget the laygear shafts; they wear at the ends due to the side
> loads.  Hopefully, the 'uprated' DWM shaft I just installed holds up.
>
> ps.  The only laygears I've seen advertised were 'rebuilt'--i.e. welded
> together--is there a source now for new laygears?
>
> bs
>
> On 3/4/2020 9:15 PM, Michael Salter wrote:
> > One consideration regarding the use of 1st gear is the durability of
> > said gear. With a count of only 13 the straight cut teeth on the
> > laygear tend to wear very quickly when subjected to any sort of load.
> > Although laygears and 1st gears are available rebuilding a gearbox is
> > not an inexpensive exercise so starting off gently in 2nd gear is
> > HIGHLY recommended.
> >
> > M
> >
>
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