[Healeys] Overdrive inhibitor switch BN1

Michael Salter michaelsalter at gmail.com
Wed Jul 28 11:06:13 MDT 2021

Thanks for the reply John, I  have some of the "O" rings so maybe I'll give
it another try. I really don't like "putting up" with a leak.


On Wed., Jul. 28, 2021, 11:14 a.m. john harper, <ah100tech at gmail.com> wrote:

> Mike
> I have been successful in replacing the 'O' ring but I had a problem
> getting the correct size and being oil resistant.
> I say successful but this was only about 4 years ago so it may not last as
> long as the original. Time will tell!
> Best regards
> On Wed, 28 Jul 2021 at 15:15, Michael Salter via Healeys <
> healeys at autox.team.net> wrote:
>> On the BN1 gearbox the overdrive inhibitor switch is immersed in oil and
>> is frequently a source of leakage.  The original switch was part # 2H2272
>> which changed up to 11G3062. The Lucas # for that switch is 31077 and these
>> are screw terminal switches.
>> These switches incorporate an "O" ring seal on the plunger to stop oil
>> leaking through the switch.  After 60 years the "O" rings tend to leak
>> (appalling quality) and it becomes necessary to  change the switch, as
>> replacing the "O" ring involves disassembling the switch and usually
>> doesn't work.
>> The original Lucas 31077 switches are of course NLA.
>> Lucas now supplies a Lucar terminal switch as a replacement.
>> In later applications the "O" ring seal in not required as the switch is
>> no longer immersed in oil, although on the side shift boxes it is subjected
>> to oil splash.
>> I have installed a new Lucas switch on a BN1 gearbox but during a Varsol
>> leak test it leaks significantly and I'm suspicious that it has no oil
>> seal.
>> I'm awaiting the delivery of a replacement but was wondering if anyone
>> else has had success with the currently available switch in a BN1 box.
>> M
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