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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
On Wed., Jul. 28, 2021, 11:24 a.m. Roger Grace, <roggrace@telus.net> wrote:
> What is a Varsol leak test ? !
> rg
>
> On Wed, Jul 28, 2021 at 7:15 AM 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">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't en=
joy re & 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, <<a href=3D"mailto:roggrace@telus.net";>roggrace@telus.net</a>> 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 <<a href=3D"mailto:healeys@autox.team.net"; t=
arget=3D"_blank" rel=3D"noreferrer">healeys@autox.team.net</a>> 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 "O" ring seal on the plunger to stop oil leaking through the=
switch.=C2=A0 After 60 years the "O" rings tend to leak (appalli=
ng quality) and it becomes necessary to=C2=A0 change the switch, as replaci=
ng the "O" ring involves disassembling the switch and usually doe=
sn'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 "O" 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'm suspic=
ious that it has no oil seal.=C2=A0</div><div dir=3D"auto">I'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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