Mirek,
I don't believe the OD 3/4 gear switch touches brass. I think that it
presses against a flat on the control lever (1B3706) that the bottom of
the gear shift lever fits in.
Item 94 on the Moss parts diagram:
https://mossmotors.com/austin-healey-100-100-6-3000/clutch-gearbox-drivetrain/gearbox-driveshaft/external-gearbox-4-speed-side-shift
Or item # 28 / illus # 123 on page F.4 at John New's online parts list:
https://lbcdigital.com/bmc_publications/akd1151/
Cheers,
Bob Haskell
Austin Healey 3000 BN7/BT7 registrar
On 6/16/22 10:19 AM, m.g.sharp@sympatico.ca wrote:
>
> Thanks Mike, I might take the switch off the other gâ??box first and
> try it. However, given that the switch has a steel ball on the end
> which engages onto the brass shift fork, I suspect it is the brass
> that wears. So unless the replacement switches are a smidgen longer,
> I donâ??t see how that would change things. Anyhow, I know what the
> problem is, so when I have it apart I will figure out a solution.
>
> Thanks, Mirek
>
> *From:*Michael Salter <michaelsalter@gmail.com>
> *Sent:* June 16, 2022 7:55 AM
> *To:* Mirek Sharp <m.g.sharp@sympatico.ca>
> *Cc:* Healey List <healeys@autox.team.net>
> *Subject:* Re: [Healeys] Another O/D issue
>
> Hi Mirek, normally there are thin fiber washers under the switch which
> are used for adjustment.
>
> Most are fitted with 1 washer but occasionally you will find 2.
>
> Removing a washer will effectively move the switch further into the
> gearbox which should resolve your issue.
>
> If there are no washers it's probably best to buy a replacement
> switch. The switches available from the usual suspects seem to be
> quite reliable.
>
> M
>
> On Wed., Jun. 15, 2022, 10:33 p.m. , <m.g.sharp@sympatico.ca> wrote:
>
> Hi listers, I am finding that my BT7 (i.e. sideshifter) is
> dropping out of overdrive if I wiggle the shift lever to the
> left. This is without doubt opening the contact in the gearbox
> switch that only permits the O/D to operate in 3^rd and 4^th thus
> causing the O/D to disengage. Pushing the lever to the right
> re-engages it. I do not recall any adjustment on the switch to
> screw it in further, in fact I think it is a pipe thread and will
> only go in so far. I am not sure what part of the shift lever
> actually bears on the end of the switch to engage it. The workshop
> manual is not much help in figuring it out. Is it the switch or
> is it what ever it bears on when in 3^rd or 4^th ?  I have not
> had the gâ??box cover off to look at it yet but thought Iâ??d ask the
> list if anyone had encountered this.
>
> Thoughts and ideas?
>
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