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Are you sure it isn't the gear oil?
The factory has always called for engine oil. There has been a lot of =
ridiculous debate over precisely what grade of engine oil (personally, I =
don=E2=80=99t think it matters, but let=E2=80=99s not start that), but =
there is certainly a large difference in viscosity between say 20W50, =
and 85W90. The overdrive, unlike the rest of the transmission, uses oil =
in a hydraulic function, not just as splash lubrication, so viscosity is =
probably very important.
--
Max Heim
mvheim@sonic.net
> On Jan 17, 2019, at 11:13 AM, Jack Wheeler via Mgs =
<mgs@autox.team.net> wrote:
>=20
> Does anyone have a good exploded diagram of the overdrive unit used in =
a 1971 MGB, that you could send to me? I am particularly interested in =
the pump assembly. I changed the oil in my gearbox this week, using EP =
85/90 GL-4 gear oil, as recommended in a recent article in the MG Driver =
magazine.
>=20
> While the car was up in the air, I noticed a leak around the plug =
which holds the pump assembly in place. So, I removed the pump, careful =
to keep all the pieces in the order in which they came out. I cleaned =
everything up, and reinstalled the pump assembly and plug (part number =
466-315 in the Moss catalog), with a new gasket. I thought I had all of =
the pieces of the pump assembly (items 62-66 in the Moss diagram) in the =
right order when I reinstalled it, but when I took the car out for a =
test drive, the overdrive would not engage.
>=20
> In addition to trying to keep the pieces in the order in which they =
came out, I also used the exploded diagram in the Moss catalog (Page 41) =
as a guide. The Moss diagram, however, is different than my overdrive =
unit. Moss says their diagram is for cars from 1968 to 1980, but =
apparently, some things were changed during that time frame. I can't =
believe the engineers would let anything go unchanged for 12 years! It =
looks like the plunger (Moss part number 466-305) shown in the Moss =
catalog diagram has a roller on the end of it. My plunger does not have =
a roller on the end of it. Maybe this will give you a lead to which =
diagram I am looking for.
>=20
> So, that leaves me looking for a good exploded diagram of the unit =
used in a 1971 model. Can anyone help with that, or does anyone have =
any suggestions as to what I might have done to make the overdrive not =
work, when it has always worked fine. Thanks.
>=20
> Jack Wheeler
> _______________________________________________
>=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
>=20
> Unsubscribe: =
http://autox.team.net/mailman/options/mgs/mvheim@sonic.net
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<html><head><meta http-equiv=3D"Content-Type" content=3D"text/html =
charset=3Dutf-8"></head><body style=3D"word-wrap: break-word; =
-webkit-nbsp-mode: space; -webkit-line-break: after-white-space;" =
class=3D""><div class=3D"">Are you sure it isn't the gear oil?</div><div =
class=3D""><br class=3D""></div><div class=3D"">The factory has always =
called for engine oil. There has been a lot of ridiculous debate over =
precisely what grade of engine oil (personally, I don=E2=80=99t think it =
matters, but let=E2=80=99s not start that), but there is certainly a =
large difference in viscosity between say 20W50, and 85W90. The =
overdrive, unlike the rest of the transmission, uses oil in a hydraulic =
function, not just as splash lubrication, so viscosity is probably very =
important.</div><div class=3D""><br class=3D""></div><div class=3D"">
<div class=3D"">--</div><div class=3D"">Max Heim</div><div class=3D""><a =
href=3D"mailto:mvheim@sonic.net"; class=3D"">mvheim@sonic.net</a></div><div=
class=3D""><br class=3D""></div><br class=3D"Apple-interchange-newline">
</div>
<br class=3D""><div><blockquote type=3D"cite" class=3D""><div =
class=3D"">On Jan 17, 2019, at 11:13 AM, Jack Wheeler via Mgs <<a =
href=3D"mailto:mgs@autox.team.net"; class=3D"">mgs@autox.team.net</a>> =
wrote:</div><br class=3D"Apple-interchange-newline"><div class=3D""><div =
class=3D""><div class=3D"ydp626bf091yahoo-style-wrap" =
style=3D"font-family: Helvetica Neue, Helvetica, Arial, sans-serif; =
font-size: 13px;">Does anyone have a good exploded diagram of the =
overdrive unit used in a 1971 MGB, that you could send to me? I am =
particularly interested in the pump assembly. I changed the oil in =
my gearbox this week, using EP 85/90 GL-4 gear oil, as recommended in a =
recent article in the MG Driver magazine.</div><div =
class=3D"ydp626bf091yahoo-style-wrap" style=3D"font-family: Helvetica =
Neue, Helvetica, Arial, sans-serif; font-size: 13px;"><br =
class=3D""></div><div class=3D"ydp626bf091yahoo-style-wrap" =
style=3D"font-family: Helvetica Neue, Helvetica, Arial, sans-serif; =
font-size: 13px;">While the car was up in the air, I noticed a leak =
around the plug which holds the pump assembly in place. So, I =
removed the pump, careful to keep all the pieces in the order in which =
they came out. I cleaned everything up, and reinstalled the pump =
assembly and plug (part number 466-315 in the Moss catalog), with a new =
gasket. I thought I had all of the pieces of the pump assembly =
(items 62-66 in the Moss diagram) in the right order when I reinstalled =
it, but when I took the car out for a test drive, the overdrive would =
not engage.</div><div class=3D"ydp626bf091yahoo-style-wrap" =
style=3D"font-family: Helvetica Neue, Helvetica, Arial, sans-serif; =
font-size: 13px;"><br class=3D""></div><div =
class=3D"ydp626bf091yahoo-style-wrap" style=3D"font-family: Helvetica =
Neue, Helvetica, Arial, sans-serif; font-size: 13px;">In addition to =
trying to keep the pieces in the order in which they came out, I also =
used the exploded diagram in the Moss catalog (Page 41) as a =
guide. The Moss diagram, however, is different than my overdrive =
unit. Moss says their diagram is for cars from 1968 to 1980, but =
apparently, some things were changed during that time frame. I =
can't believe the engineers would let anything go unchanged for 12 =
years! It looks like the plunger (Moss part number 466-305) shown =
in the Moss catalog diagram has a roller on the end of it. My =
plunger does not have a roller on the end of it. Maybe this will =
give you a lead to which diagram I am looking for.<br =
class=3D""></div><div class=3D"ydp626bf091yahoo-style-wrap" =
style=3D"font-family: Helvetica Neue, Helvetica, Arial, sans-serif; =
font-size: 13px;"><br class=3D""></div><div =
class=3D"ydp626bf091yahoo-style-wrap" style=3D"font-family: Helvetica =
Neue, Helvetica, Arial, sans-serif; font-size: 13px;">So, that leaves me =
looking for a good exploded diagram of the unit used in a 1971 =
model. Can anyone help with that, or does anyone have any =
suggestions as to what I might have done to make the overdrive not work, =
when it has always worked fine. Thanks.</div><div =
class=3D"ydp626bf091yahoo-style-wrap" style=3D"font-family: Helvetica =
Neue, Helvetica, Arial, sans-serif; font-size: 13px;"><br =
class=3D""></div><div class=3D"ydp626bf091yahoo-style-wrap" =
style=3D"font-family: Helvetica Neue, Helvetica, Arial, sans-serif; =
font-size: 13px;">Jack Wheeler<br =
class=3D""></div></div>_______________________________________________<br =
class=3D""><br class=3D""><a href=3D"mailto:Mgs@autox.team.net"; =
class=3D"">Mgs@autox.team.net</a><br class=3D"">Donate: =
$12.75<br class=3D""><br class=3D"">Archive: =
http://www.team.net/pipermail/mgs<br class=3D""><br =
class=3D"">Unsubscribe: =
http://autox.team.net/mailman/options/mgs/mvheim@sonic.net<br =
class=3D""></div></blockquote></div><br class=3D""></body></html>=
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