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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"ltr">Mike<div><br></div><div>I have been successful in replacin=
g the 'O' ring but I had a problem getting the correct size and bei=
ng oil resistant.</div><div><br></div><div>I say successful=C2=A0but this w=
as only about 4 years=C2=A0ago so it may not last as long as the original. =
Time will tell!</div><div><br></div><div>Best regards</div></div><br><div c=
lass=3D"gmail_quote"><div dir=3D"ltr" class=3D"gmail_attr">On Wed, 28 Jul 2=
021 at 15:15, Michael Salter via Healeys <<a href=3D"mailto:healeys@auto=
x.team.net">healeys@autox.team.net</a>> wrote:<br></div><blockquote clas=
s=3D"gmail_quote" style=3D"margin:0px 0px 0px 0.8ex;border-left:1px solid r=
gb(204,204,204);padding-left:1ex"><div dir=3D"auto">On the BN1 gearbox the =
overdrive inhibitor switch is immersed in oil and is frequently a source of=
leakage.=C2=A0 The original switch was part # 2H2272 which changed up to 1=
1G3062. The Lucas # for that switch is 31077 and these are screw terminal s=
witches.<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 becom=
es necessary to=C2=A0 change the switch, as replacing the "O" rin=
g involves disassembling the switch and usually doesn't work.</div><div=
dir=3D"auto">The original Lucas 31077 switches are of course NLA.=C2=A0</d=
iv><div dir=3D"auto">Lucas now supplies a Lucar terminal switch as a replac=
ement.</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 o=
n the 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 repla=
cement but was wondering if anyone else has had success with the currently =
available switch in a BN1 box.</div><div dir=3D"auto"><br></div><div dir=3D=
"auto">M</div></div>
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