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Dave,
There are two types of starters that could be on your engine. =20
Early, like those on MGA, were Bendix-type, in which the inertia of=
the pinion caused it to unwind on starter motor shaft. It unwound on the co=
arse threads until the pinion meshed with teeth on the ring gear, then it st=
opped unwinding and the starter turned Bendix gear and the ring gear to star=
t the engine.
Later starters were called =E2=80=98pre-engaged=E2=80=99. In these,=
power from starter switch moved the electromagnet in the starter solenoid w=
hich has a lever that moves the pinion into engagement with the ring gear, t=
hen the solenoid powers the starter, which turns the gear and ring gear.
If your starter is a cylinder, only a cylinder, like the cylinder-s=
hape of the dynamo, it is Bendix type. If it has not been used in 18 months,=
it is possible that the Bendix gear is hanging on a tiny bit of rust on the=
coarse threads, so the Bendix is not turning the ring gear. Disassemble, c=
lean the threads, use a dry lubricant like teflon or graphite, and it should=
work as new.=20
If it is the later type, which you can identify by a smaller cylind=
er mounted on the starter, in line with its shaft, yours is pre-engaged. Yo=
u say the starter spins, so it is probably OK, the problem being non-engagem=
ent. I would check again for free movement of the pinion. I=E2=80=99ve neve=
r faced this with a pre-engaged, but I don=E2=80=99t rule that out.
Bob
> On Jun 8, 2024, at 1:33=E2=80=AFPM, dave northrup <dave@ranteer.com> wrote=
:
>=20
> =EF=BB=BF
> Early 5 main mgb engine in a 58 mga. Received in kit form; been working o=
n this thing for 18 months.=20
> =20
> I think the conclusion is pretty obvious; just looking for confirmation.
> =20
> The starter would turn the engine over, then just spin. Wait until it sto=
ps, try again. Usually after a few tries the engine would start.
> =20
> Now it just spins. Was that a sign that the starter was going? Is it now=
gone? And doesn=E2=80=99t activate the gear so the engine doesn=E2=80=99t t=
urn over?
> _______________________________________________
>=20
> Mgs@autox.team.net
> Donate: http://www.team.net/donate.html
> Suggested annual donation $12.75
>=20
> Archive: http://www.team.net/pipermail/mgs http://autox.team.net/archive
>=20
> Unsubscribe: http://autox.team.net/mailman/options/mgs/mgbobh@gmail.com
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<html><head><meta http-equiv=3D"content-type" content=3D"text/html; charset=3D=
utf-8"></head><body dir=3D"auto"><div dir=3D"ltr"></div><div dir=3D"ltr">Dav=
e,</div><div dir=3D"ltr"><span class=3D"Apple-tab-span" style=3D"white-space=
:pre"> </span>There are two types of starters that could be on your engine=
. </div><div dir=3D"ltr"><span class=3D"Apple-tab-span" style=3D"white=
-space:pre"> </span>Early, like those on MGA, were Bendix-type, in which=
the inertia of the pinion caused it to unwind on starter motor shaft. It un=
wound on the coarse threads until the pinion meshed with teeth on the ring g=
ear, then it stopped unwinding and the starter turned Bendix gear and the ri=
ng gear to start the engine.</div><div dir=3D"ltr"><span class=3D"Apple-tab-=
span" style=3D"white-space:pre"> </span>Later starters were called =E2=
=80=98pre-engaged=E2=80=99. In these, power from starter switch moved the el=
ectromagnet in the starter solenoid which has a lever that moves the pinion i=
nto engagement with the ring gear, then the solenoid powers the starter, whi=
ch turns the gear and ring gear.</div><div dir=3D"ltr"><span class=3D"Apple-=
tab-span" style=3D"white-space:pre"> </span>If your starter is a cylinde=
r, only a cylinder, like the cylinder-shape of the dynamo, it is Bendix type=
. If it has not been used in 18 months, it is possible that the Bendix gear i=
s hanging on a tiny bit of rust on the coarse threads, so the Bendix is not t=
urning the ring gear. Disassemble, clean the threads, use a dry lubri=
cant like teflon or graphite, and it should work as new. </div><div dir=
=3D"ltr"><span class=3D"Apple-tab-span" style=3D"white-space:pre"> </s=
pan>If it is the later type, which you can identify by a smaller cylinder mo=
unted on the starter, in line with its shaft, yours is pre-engaged. Yo=
u say the starter spins, so it is probably OK, the problem being non-engagem=
ent. I would check again for free movement of the pinion. I=E2=80=99ve=
never faced this with a pre-engaged, but I don=E2=80=99t rule that out.</di=
v><div dir=3D"ltr">Bob</div><div dir=3D"ltr"><br></div><div dir=3D"ltr"><br>=
<blockquote type=3D"cite">On Jun 8, 2024, at 1:33=E2=80=AFPM, dave northrup &=
lt;dave@ranteer.com> wrote:<br><br></blockquote></div><blockquote type=3D=
"cite"><div dir=3D"ltr">=EF=BB=BF
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<p class=3D"MsoNormal">Early 5 main mgb engine in a 58 mga. Received i=
n kit form; been working on this thing for 18 months.
<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p> </o:p></p>
<p class=3D"MsoNormal">I think the conclusion is pretty obvious; just lookin=
g for confirmation.<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p> </o:p></p>
<p class=3D"MsoNormal">The starter would turn the engine over, then just spi=
n. Wait until it stops, try again. Usually after a few tries the=
engine would start.
<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p> </o:p></p>
<p class=3D"MsoNormal">Now it just spins. Was that a sign that the sta=
rter was going? Is it now gone? And doesn=E2=80=99t activate the=
gear so the engine doesn=E2=80=99t turn over?<o:p></o:p></p>
</div>
<span>_______________________________________________</span><br><span></span=
><br><span>Mgs@autox.team.net</span><br><span>Donate: http://www.team.net/do=
nate.html</span><br><span>Suggested annual donation $12.75</span><br><=
span></span><br><span>Archive: http://www.team.net/pipermail/mgs http://auto=
x.team.net/archive</span><br><span></span><br><span>Unsubscribe: http://auto=
x.team.net/mailman/options/mgs/mgbobh@gmail.com</span><br></div></blockquote=
></body></html>=
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_______________________________________________
Mgs@autox.team.net
Archive: http://www.team.net/pipermail/mgs http://autox.team.net/archive
Unsubscribe: http://autox.team.net/mailman/options/mgs/mharc@autox.team.net
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