Re: [Mgs] Overdrive Diagram

[Lawrence Swift via Mgs <mgs@autox.team.net>]

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I used synthetic which resulted in enormous leaks; went back to 30 wt ND =
- now no problems.

> On Jan 18, 2019, at 12:51 PM, Barrie Robinson via Mgs =
<mgs@autox.team.net> wrote:
>=20
>   Hello folks
>=20
> I know not if his helps but in matters of transmissions I would use =
synthetic.  I had a new Maserati Biturbo and when cold had a very sticky =
2nd gear and "running it in" was not my idea of fun.   Dealer said Alfa =
Romeo had had success with synthetic as they also had a sticky 2nd.  So =
synthetic went in - HUGE success - never had tough 2nd gear again.  =20
> <Barrie' signature for emails.jpg>
>=20
>=20
>=20
> On 1/17/2019 6:41 PM, Max Heim via Mgs wrote:
>> Are you sure it isn't the gear oil?
>>=20
>> 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.
>>=20
>> --
>> Max Heim
>>=20
>>=20
>>=20
>>> On Jan 17, 2019, at 11:13 AM, Jack Wheeler via Mgs =
>>>=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
>>> Donate: http://www.team.net/donate.html =
<http://www.team.net/donate.html>
>>> Suggested annual donation  $12.75
>>>=20
>>> Archive: http://www.team.net/pipermail/mgs =
<http://www.team.net/pipermail/mgs>
>>>=20
>>> Unsubscribe: =
http://autox.team.net/mailman/options/mgs/mvheim@sonic.net =
<http://autox.team.net/mailman/options/mgs/mvheim@sonic.net>
>>=20
>>=20
>>=20
>> _______________________________________________
>>=20
>> Donate: http://www.team.net/donate.html =
<http://www.team.net/donate.html>
>> Suggested annual donation  $12.75
>>=20
>> Archive: http://www.team.net/pipermail/mgs =
<http://www.team.net/pipermail/mgs>
>>=20
>> Unsubscribe: =
http://autox.team.net/mailman/options/mgs/barrob@bell.net =
<http://autox.team.net/mailman/options/mgs/barrob@bell.net>
>=20
> _______________________________________________
>=20
> Mgs@autox.team.net
> Donate: http://www.team.net/donate.html
> Suggested annual donation  $12.75
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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"">I used synthetic which resulted in enormous leaks; went back =
to 30 wt ND - now no problems.<div class=3D""><br =
class=3D""><div><blockquote type=3D"cite" class=3D""><div class=3D"">On =
Jan 18, 2019, at 12:51 PM, Barrie Robinson via Mgs &lt;<a =
href=3D"mailto:mgs@autox.team.net"; class=3D"">mgs@autox.team.net</a>&gt; =
wrote:</div><br class=3D"Apple-interchange-newline"><div class=3D"">
 =20
    <meta http-equiv=3D"Content-Type" content=3D"text/html; =
charset=3DUTF-8" class=3D"">
 =20
  <div text=3D"#000000" bgcolor=3D"#FFFFFF" class=3D"">
    <div class=3D"moz-cite-prefix">&nbsp; Hello folks<br class=3D"">
    </div>
    <div class=3D"moz-cite-prefix"><br class=3D"">
    </div>
    <div class=3D"moz-cite-prefix">I know not if his helps but in =
matters
      of transmissions I would use synthetic.&nbsp; I had a new Maserati
      Biturbo and when cold had a very sticky 2nd gear and "running it
      in" was not my idea of fun.&nbsp;&nbsp; Dealer said Alfa Romeo had =
had
      success with synthetic as they also had a sticky 2nd.&nbsp; So
      synthetic went in - HUGE success - never had tough 2nd gear
      again.&nbsp;&nbsp; <br class=3D"">
    </div>
    <span id=3D"cid:part1.16810305.ED406CC2@bell.net">&lt;Barrie' =
signature for emails.jpg&gt;</span>
    <div class=3D"moz-cite-prefix"><br class=3D"">
    </div>
    <div class=3D"moz-cite-prefix"><br class=3D"">
    </div>
    <div class=3D"moz-cite-prefix"><br class=3D"">
    </div>
    <div class=3D"moz-cite-prefix">On 1/17/2019 6:41 PM, Max Heim via =
Mgs
      wrote:<br class=3D"">
    </div>
    <blockquote type=3D"cite" =
cite=3D"mid:35E385F4-A820-4D33-9B0B-19DDC19D306E@sonic.net" class=3D"">
      <meta http-equiv=3D"Content-Type" content=3D"text/html; =
charset=3DUTF-8" 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"" =
moz-do-not-send=3D"true">mvheim@sonic.net</a></div>
        <div class=3D""><br class=3D"">
        </div>
        <br class=3D"Apple-interchange-newline">
      </div>
      <br class=3D"">
      <div class=3D"">
        <blockquote type=3D"cite" class=3D"">
          <div class=3D"">On Jan 17, 2019, at 11:13 AM, Jack Wheeler via
            Mgs &lt;<a href=3D"mailto:mgs@autox.team.net"; class=3D"" =
moz-do-not-send=3D"true">mgs@autox.team.net</a>&gt; 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?&nbsp; I am particularly
                interested in the pump assembly.&nbsp; 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.&nbsp; So, I removed the =
pump,
                careful to keep all the pieces in the order in which
                they came out.&nbsp; I cleaned everything up, and =
reinstalled
                the pump assembly and plug (part number 466-315 in the
                Moss catalog), with a new gasket.&nbsp; 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.&nbsp; The Moss diagram, however, is =
different
                than my overdrive unit.&nbsp; Moss says their diagram is =
for
                cars from 1968 to 1980, but apparently, some things were
                changed during that time frame.&nbsp; I can't believe =
the
                engineers would let anything go unchanged for 12 =
years!&nbsp;
                It looks like the plunger (Moss part number 466-305)
                shown in the Moss catalog diagram has a roller on the
                end of it.&nbsp; My plunger does not have a roller on =
the end
                of it.&nbsp; 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.&nbsp; 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.&nbsp;
                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"">=

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