[Healeys] Another O/D issue

[Bob Haskell]

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 at sympatico.ca wrote:
>
> Thanks Mike,  I might take the switch off the other g’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 don’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 at gmail.com>
> *Sent:* June 16, 2022 7:55 AM
> *To:* Mirek Sharp <m.g.sharp at sympatico.ca>
> *Cc:* Healey List <healeys at 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 at 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 g’box cover off to look at it yet but thought I’d ask the
>     list if anyone had encountered this.
>
>     Thoughts and ideas?
>
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