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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.
M
On Wed., Jul. 28, 2021, 11:14 a.m. john harper, <ah100tech@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@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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<div dir=3D"auto">Thanks for the reply John, I=C2=A0 have some of the "=
;O" rings so maybe I'll give it another try. I really don't li=
ke "putting up" with a leak.<div dir=3D"auto"><br></div><div dir=
=3D"auto">M</div></div><br><div class=3D"gmail_quote"><div dir=3D"ltr" clas=
s=3D"gmail_attr">On Wed., Jul. 28, 2021, 11:14 a.m. john harper, <<a hre=
f=3D"mailto:ah100tech@gmail.com";>ah100tech@gmail.com</a>> wrote:<br></di=
v><blockquote class=3D"gmail_quote" style=3D"margin:0 0 0 .8ex;border-left:=
1px #ccc solid;padding-left:1ex"><div dir=3D"ltr">Mike<div><br></div><div>I=
have been successful in replacing the 'O' ring but I had a problem=
getting the correct size and being oil resistant.</div><div><br></div><div=
>I say successful=C2=A0but this was only about 4 years=C2=A0ago so it may n=
ot last as long as the original. Time will tell!</div><div><br></div><div>B=
est regards</div></div><br><div class=3D"gmail_quote"><div dir=3D"ltr" clas=
s=3D"gmail_attr">On Wed, 28 Jul 2021 at 15:15, Michael Salter via Healeys &=
lt;<a href=3D"mailto:healeys@autox.team.net"; target=3D"_blank" rel=3D"noref=
errer">healeys@autox.team.net</a>> wrote:<br></div><blockquote class=3D"=
gmail_quote" style=3D"margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(20=
4,204,204);padding-left:1ex"><div dir=3D"auto">On the BN1 gearbox the overd=
rive inhibitor switch is immersed in oil and is frequently a source of leak=
age.=C2=A0 The original switch was part # 2H2272 which changed up to 11G306=
2. The Lucas # for that switch is 31077 and these are screw terminal switch=
es.<div dir=3D"auto">These switches incorporate an "O" ring seal =
on the plunger to stop oil leaking through the switch.=C2=A0 After 60 years=
the "O" rings tend to leak (appalling quality) and it becomes ne=
cessary to=C2=A0 change the switch, as replacing the "O" ring inv=
olves disassembling the switch and usually doesn't work.</div><div dir=
=3D"auto">The original Lucas 31077 switches are of course NLA.=C2=A0</div><=
div dir=3D"auto">Lucas now supplies a Lucar terminal switch as a replacemen=
t.</div><div dir=3D"auto">In later applications the "O" ring seal=
in not required as the switch is no longer immersed in oil, although on th=
e side shift boxes it is subjected to oil splash.</div><div dir=3D"auto">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=
.=C2=A0</div><div dir=3D"auto">I'm awaiting the delivery of a replaceme=
nt but was wondering if anyone else has had success with the currently avai=
lable switch in a BN1 box.</div><div dir=3D"auto"><br></div><div dir=3D"aut=
o">M</div></div>
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