[Healeys] Differential vs BN2 OVERDRIVE

[Bob Spidell]

I've only rebuilt my BJ8 gearbox a couple times, but haven't had any 
visible wear on the needle bearings.  Last rebuild, I replaced them 'on 
principle.'  I wonder if using synthetic gearbox oil helps preserve them?


On 3/5/2020 10:25 PM, Patrick & Caroline Quinn wrote:
>
> Hello Mike
>
> Can you please let us know how the magnet is fitted to the gearbox 
> drain plug for a sideshift box.
>
> They can be purchased complete from Denis Welsh for £9.95 plus 
> postage, but would be interested in doing my own.
>
> Thanks
>
> Patrick Quinn
>
> Blue Mountains, Australia
>
> *From:*Healeys [mailto:healeys-bounces at autox.team.net] *On Behalf Of 
> *Michael Salter
> *Sent:* Thursday, 5 March 2020 7:51 PM
> *To:* Bob Spidell
> *Cc:* healeys at autox.team.net
> *Subject:* Re: [Healeys] Differential vs BN2 OVERDRIVE
>
> 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 
> <mailto: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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