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Simon
The overheating is likely to because the armature has not risen enough to
break the contacts to the heavy pick coil. There is for a short while about
22 amps is flowing which heats up the heavy coil to the point where it
fails or the heavy contacts burn out. When operating correctly only the
hold current should be taken; perhaps 3 amps. The action is that the heavy
coil is needed to raise armature until when it is at the top it breaks the
heavy current. The hold coil is sufficient to do as it says and keeps the
armature in place causing the overdrive to operate.
A frequent cause of the ODs with an open frame and with a rubber bottom
stop is that this rubber button rots with oil or falls out. With the
armature lower than it should be with the button in place the pick current
is insufficient to lift the armature with only part of it inside the coil.
the coil will then keep taking current.
On mine, I have drilled and tapped the hole in which the rubber stop was
fitted to allow a bolt and nut to be fitted that can then be adjusted as is
possible on the enclosed versions
Best regards
On Fri, 25 Mar 2022 at 15:13, Michael Salter <michaelsalter@gmail.com>
wrote:
> Bluntly Simon, the operating valve was NOT set up correctly.
> The "pull" coil was still being powered and drawing probably some 20 amps=
.
> New solenoid required and some careful setup.
>
> M
>
> On Fri., Mar. 25, 2022, 10:50 a.m. Simon Lachlan via Healeys, <
> healeys@autox.team.net> wrote:
>
>> Since we=E2=80=99re on the OD topic=E2=80=A6.
>>
>> I took my MkII BT7 out the other day, first time for ages, 8 weeks+/-.
>>
>> Anyhow, the OD didn=E2=80=99t work. I=E2=80=99d been to a carpet trimmer=
and left my
>> tunnel cover with him so access was easy=E2=80=A6=E2=80=A6
>>
>> The solenoid was very hot=E2=80=A6too hot to touch which made me suspici=
ous.
>> Anyhow, I did my OD electrical click-test and it failed at the first
>> hurdle. So, I took the solenoid out and=E2=80=A6well, look at the pictur=
e.
>>
>> The plastic/nylon cover to the points and wiring was virtually welded in
>> place. And the inside is a complete mess.
>>
>> So, the OD was rebuilt about 50 miles ago by OD Spares and I=E2=80=99m h=
appy with
>> the wiring. My question is this=E2=80=A6is there a frequent or a probabl=
e cause to
>> these fry ups?? These things check out at about =C2=A350:00 so I don=E2=
=80=99t want to
>> be chucking them in at regular intervals. Anything in particular that I
>> should look out for???
>>
>> Thanks,
>>
>> Simon
>> _______________________________________________
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>>
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>>
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>>
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>>
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>
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<div dir=3D"ltr">Simon<div><br></div><div>The overheating is likely to beca=
use the armature has not risen enough to break the=C2=A0contacts to the hea=
vy pick coil. There is for a short while about 22 amps is flowing which hea=
ts up the heavy coil to the point where it fails or the heavy contacts burn=
out. When operating correctly only the hold current=C2=A0should be taken; =
perhaps=C2=A03 amps.=C2=A0 The action is that the heavy coil is needed to r=
aise=C2=A0armature until when it is at the top it breaks the heavy current.=
The hold coil is sufficient to do as it says and keeps the armature in pla=
ce causing the=C2=A0overdrive to operate.</div><div><br></div><div>A freque=
nt=C2=A0cause of the ODs with an open frame and with a rubber bottom stop i=
s that this rubber button rots with oil or falls out. With the armature low=
er than it should be with the button in place the pick current is insuffici=
ent=C2=A0to lift the armature=C2=A0with only part of it inside the coil.=C2=
=A0 the coil will then keep taking current.=C2=A0</div><div><br></div><div>=
On mine, I have drilled and tapped the hole in which=C2=A0the rubber stop w=
as fitted to allow a bolt and nut to be fitted that can then be adjusted as=
is possible on the enclosed versions</div><div><br></div><div>Best regards=
</div></div><br><div class=3D"gmail_quote"><div dir=3D"ltr" class=3D"gmail_=
attr">On Fri, 25 Mar 2022 at 15:13, Michael Salter <<a href=3D"mailto:mi=
chaelsalter@gmail.com">michaelsalter@gmail.com</a>> wrote:<br></div><blo=
ckquote 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">Bluntly Sim=
on, the operating valve was NOT set up correctly.=C2=A0<div dir=3D"auto">Th=
e "pull" coil was still being powered and drawing probably some 2=
0 amps.</div><div dir=3D"auto">New solenoid required and some careful setup=
.</div><div dir=3D"auto"><br></div><div dir=3D"auto">M</div></div><br><div =
class=3D"gmail_quote"><div dir=3D"ltr" class=3D"gmail_attr">On Fri., Mar. 2=
5, 2022, 10:50 a.m. Simon Lachlan via Healeys, <<a href=3D"mailto:healey=
s@autox.team.net" target=3D"_blank">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 lang=3D"EN-G=
B"><div><p class=3D"MsoNormal">Since we=E2=80=99re on the OD topic=E2=80=A6=
.<u></u><u></u></p><p class=3D"MsoNormal">I took my MkII BT7 out the other =
day, first time for ages, 8 weeks+/-.<u></u><u></u></p><p class=3D"MsoNorma=
l">Anyhow, the OD didn=E2=80=99t work. I=E2=80=99d been to a carpet trimmer=
and left my tunnel cover with him so access was easy=E2=80=A6=E2=80=A6<u><=
/u><u></u></p><p class=3D"MsoNormal">The solenoid was very hot=E2=80=A6too =
hot to touch which made me suspicious. Anyhow, I did my OD electrical click=
-test and it failed at the first hurdle. So, I took the solenoid out and=E2=
=80=A6well, look at the picture.<u></u><u></u></p><p class=3D"MsoNormal">Th=
e plastic/nylon cover to the points and wiring was virtually welded in plac=
e. And the inside is a complete mess.<u></u><u></u></p><p class=3D"MsoNorma=
l">So, the OD was rebuilt about 50 miles ago by OD Spares and I=E2=80=99m h=
appy with the wiring. My question is this=E2=80=A6is there a frequent or a =
probable cause to these fry ups?? These things check out at about =C2=A350:=
00 so I don=E2=80=99t want to be chucking them in at regular intervals. Any=
thing in particular that I should look out for???<u></u><u></u></p><p class=
=3D"MsoNormal">Thanks,<u></u><u></u></p><p class=3D"MsoNormal">Simon<u></u>=
<u></u></p></div></div>_______________________________________________<br>
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r>
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</blockquote></div>
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