[Healeys] Overdrive inhibitor switch BN1

Michael Salter michaelsalter at gmail.com
Wed Jul 28 11:02:26 MDT 2021

Varsol leak test.
The BN1 gearbox is notorious for leaks, some of which cannot be corrected
without removing and disassembling the gearbox.
After I  rebuild one I set it up level on my work bench and add the full
capacity of Varsol. I leave the box overnight then check for leaks the next
If all is good I  drain off the Varsol and install the box.
Well worth the effort as I  don't enjoy re & reing the box to resolve leaks.


On Wed., Jul. 28, 2021, 11:24 a.m. Roger Grace, <roggrace at telus.net> wrote:

> What is a Varsol leak test ? !
> rg
> On Wed, Jul 28, 2021 at 7:15 AM 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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