Subject: Re: [Healeys] Overdrive inhibitor switch BN1

From: john harper <[email-masked]>
Date: Wed, 28 Jul 2021 16:14:26 +0100

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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 <
[email-masked]> 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 &#39;O&#39; 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 &lt;<a href=3D"mailto:healeys@auto=
x.team.net">[email-masked]</a>&gt; 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 &quot;O&quot; ring =
seal on the plunger to stop oil leaking through the switch.=C2=A0 After 60 =
years the &quot;O&quot; rings tend to leak (appalling quality) and it becom=
es necessary to=C2=A0 change the switch, as replacing the &quot;O&quot; rin=
g involves disassembling the switch and usually doesn&#39;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 &quot;O&quot; 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&#39;m suspicious that it has no oil =
seal.=C2=A0</div><div dir=3D"auto">I&#39;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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From: Roger Grace via Healeys <[email-masked]>
Date: Wed, 28 Jul 2021 08:23:54 -0700

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What is a Varsol leak test ? !
rg

On Wed, Jul 28, 2021 at 7:15 AM Michael Salter via Healeys <
[email-masked]> wrote:

> http://autox.team.net/mailman/options/healeys/[email-masked]
>
>

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<div dir=3D"ltr"><div>What is a Varsol leak test ? !</div><div>rg<br></div>=
</div><br><div class=3D"gmail_quote"><div dir=3D"ltr" class=3D"gmail_attr">=
On Wed, Jul 28, 2021 at 7:15 AM Michael Salter via Healeys &lt;<a href=3D"m=
ailto:[email-masked]">[email-masked]</a>&gt; wrote:<br></di=
v><blockquote class=3D"gmail_quote" style=3D"margin:0px 0px 0px 0.8ex;borde=
r-left:1px solid rgb(204,204,204);padding-left:1ex"><div dir=3D"auto">On th=
e BN1 gearbox the overdrive inhibitor switch is immersed in oil and is freq=
uently a source of leakage.=C2=A0 The original switch was part # 2H2272 whi=
ch changed up to 11G3062. The Lucas # for that switch is 31077 and these ar=
e screw terminal switches.<div dir=3D"auto">These switches incorporate an &=
quot;O&quot; ring seal on the plunger to stop oil leaking through the switc=
h.=C2=A0 After 60 years the &quot;O&quot; rings tend to leak (appalling qua=
lity) and it becomes necessary to=C2=A0 change the switch, as replacing the=
 &quot;O&quot; ring involves disassembling the switch and usually doesn&#39=
;t work.</div><div dir=3D"auto">The original Lucas 31077 switches are of co=
urse NLA.=C2=A0</div><div dir=3D"auto">Lucas now supplies a Lucar terminal =
switch as a replacement.</div><div dir=3D"auto">In later applications the &=
quot;O&quot; 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.</di=
v><div dir=3D"auto">I have installed a new Lucas switch on a BN1 gearbox bu=
t during a Varsol leak test it leaks significantly and I&#39;m suspicious t=
hat it has no oil seal.=C2=A0</div><div dir=3D"auto">I&#39;m awaiting the d=
elivery of a replacement but was wondering if anyone else has had success w=
ith the currently available switch in a BN1 box.</div><div dir=3D"auto"><br=
></div><div dir=3D"auto">M</div></div>
s/[email-masked]" rel=3D"noreferrer" target=3D"_blank">http://autox.tea=
m.net/mailman/options/healeys/[email-masked]</a><br>
<br>
</blockquote></div>

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[email-masked]

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From: Michael Salter <[email-masked]>
Date: Wed, 28 Jul 2021 13:02:26 -0400

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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
day.
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.

M

>> else has had success with the currently available switch in a BN1 box.

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<div dir=3D"auto">Varsol leak test.<div dir=3D"auto">The BN1 gearbox is not=
orious for leaks, some of which cannot be corrected without removing and di=
sassembling the gearbox.=C2=A0</div><div dir=3D"auto">After I=C2=A0 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 day.=C2=A0</div><=
div dir=3D"auto">If all is good I=C2=A0 drain off the Varsol and install th=
e box.</div><div dir=3D"auto">Well worth the effort as I=C2=A0 don&#39;t en=
joy re &amp; reing the box to resolve leaks.</div><div dir=3D"auto"><br></d=
iv><div dir=3D"auto">M</div></div><br><div class=3D"gmail_quote"><div dir=
=3D"ltr" class=3D"gmail_attr">On Wed., Jul. 28, 2021, 11:24 a.m. Roger Grac=
e, &lt;<a href=3D"mailto:[email-masked]">[email-masked]</a>&gt; wro=
te:<br></div><blockquote class=3D"gmail_quote" style=3D"margin:0 0 0 .8ex;b=
order-left:1px #ccc solid;padding-left:1ex"><div dir=3D"ltr"><div>What is a=
 Varsol leak test ? !</div><div>rg<br></div></div><br><div class=3D"gmail_q=
uote"><div dir=3D"ltr" class=3D"gmail_attr">On Wed, Jul 28, 2021 at 7:15 AM=
 Michael Salter via Healeys &lt;<a href=3D"mailto:[email-masked]" t=
arget=3D"_blank" rel=3D"noreferrer">[email-masked]</a>&gt; wrote:<b=
r></div><blockquote class=3D"gmail_quote" style=3D"margin:0px 0px 0px 0.8ex=
;border-left:1px solid rgb(204,204,204);padding-left:1ex"><div dir=3D"auto"=
>On the BN1 gearbox the overdrive inhibitor switch is immersed in oil and i=
s frequently a source of leakage.=C2=A0 The original switch was part # 2H22=
72 which changed up to 11G3062. The Lucas # for that switch is 31077 and th=
ese are screw terminal switches.<div dir=3D"auto">These switches incorporat=
e an &quot;O&quot; ring seal on the plunger to stop oil leaking through the=
 switch.=C2=A0 After 60 years the &quot;O&quot; rings tend to leak (appalli=
ng quality) and it becomes necessary to=C2=A0 change the switch, as replaci=
ng the &quot;O&quot; ring involves disassembling the switch and usually doe=
sn&#39;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 ter=
minal switch as a replacement.</div><div dir=3D"auto">In later applications=
 the &quot;O&quot; ring seal in not required as the switch is no longer imm=
ersed in oil, although on the side shift boxes it is subjected to oil splas=
h.</div><div dir=3D"auto">I have installed a new Lucas switch on a BN1 gear=
box but during a Varsol leak test it leaks significantly and I&#39;m suspic=
ious that it has no oil seal.=C2=A0</div><div dir=3D"auto">I&#39;m awaiting=
 the delivery of a replacement but was wondering if anyone else has had suc=
cess with the currently available switch in a BN1 box.</div><div dir=3D"aut=
o"><br></div><div dir=3D"auto">M</div></div>
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From: Michael Salter <[email-masked]>
Date: Wed, 28 Jul 2021 13:06:13 -0400

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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

>> else has had success with the currently available switch in a BN1 box.

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<div dir=3D"auto">Thanks for the reply John, I=C2=A0 have some of the &quot=
;O&quot; rings so maybe I&#39;ll give it another try. I really don&#39;t li=
ke &quot;putting up&quot; 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, &lt;<a hre=
f=3D"mailto:[email-masked]">[email-masked]</a>&gt; 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 &#39;O&#39; 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:[email-masked]" target=3D"_blank" rel=3D"noref=
errer">[email-masked]</a>&gt; 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 &quot;O&quot; ring seal =
on the plunger to stop oil leaking through the switch.=C2=A0 After 60 years=
 the &quot;O&quot; rings tend to leak (appalling quality) and it becomes ne=
cessary to=C2=A0 change the switch, as replacing the &quot;O&quot; ring inv=
olves disassembling the switch and usually doesn&#39;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 &quot;O&quot; 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&#39;m suspicious that it has no oil seal=
.=C2=A0</div><div dir=3D"auto">I&#39;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>
_______________________________________________<br>
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