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 Hello folks
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.
On 1/17/2019 6:41 PM, Max Heim via Mgs wrote:
> 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 donâ??t think it matters, but letâ??s 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
>
>
>
>> On Jan 17, 2019, at 11:13 AM, Jack Wheeler via Mgs
>>
>> 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.
>>
>> 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.Â
>> 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.
>>
>> 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.
>>
>> 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.
>>
>> Jack Wheeler
>> _______________________________________________
>>
>> Donate: http://www.team.net/donate.html
>> Suggested annual donation  $12.75
>>
>> Archive: http://www.team.net/pipermail/mgs
>>
>> Unsubscribe: http://autox.team.net/mailman/options/mgs/mvheim@sonic.net
>
>
> _______________________________________________
>
> Mgs@autox.team.net
> Donate: http://www.team.net/donate.html
> Suggested annual donation $12.75
>
> Archive: http://www.team.net/pipermail/mgs
>
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<div class="moz-cite-prefix">Â Hello folks<br>
</div>
<div class="moz-cite-prefix"><br>
</div>
<div class="moz-cite-prefix">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.  <br>
</div>
<img moz-do-not-send="false"
src="cid:part1.16810305.ED406CC2@bell.net" alt="" width="200"
height="110">
<div class="moz-cite-prefix"><br>
</div>
<div class="moz-cite-prefix"><br>
</div>
<div class="moz-cite-prefix"><br>
</div>
<div class="moz-cite-prefix">On 1/17/2019 6:41 PM, Max Heim via Mgs
wrote:<br>
</div>
<blockquote type="cite"
cite="mid:35E385F4-A820-4D33-9B0B-19DDC19D306E@sonic.net">
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<div class="">Are you sure it isn't the gear oil?</div>
<div class=""><br class="">
</div>
<div class="">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 donâ??t think it matters, but letâ??s 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=""><br class="">
</div>
<div class="">
<div class="">--</div>
<div class="">Max Heim</div>
<div class=""><a href="mailto:mvheim@sonic.net"; class=""
moz-do-not-send="true">mvheim@sonic.net</a></div>
<div class=""><br class="">
</div>
<br class="Apple-interchange-newline">
</div>
<br class="">
<div>
<blockquote type="cite" class="">
<div class="">On Jan 17, 2019, at 11:13 AM, Jack Wheeler via
Mgs <<a href="mailto:mgs@autox.team.net"; class=""
moz-do-not-send="true">mgs@autox.team.net</a>> wrote:</div>
<br class="Apple-interchange-newline">
<div class="">
<div class="">
<div class="ydp626bf091yahoo-style-wrap"
style="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="ydp626bf091yahoo-style-wrap"
style="font-family: Helvetica Neue, Helvetica, Arial,
sans-serif; font-size: 13px;"><br class="">
</div>
<div class="ydp626bf091yahoo-style-wrap"
style="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="ydp626bf091yahoo-style-wrap"
style="font-family: Helvetica Neue, Helvetica, Arial,
sans-serif; font-size: 13px;"><br class="">
</div>
<div class="ydp626bf091yahoo-style-wrap"
style="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!Â
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="">
</div>
<div class="ydp626bf091yahoo-style-wrap"
style="font-family: Helvetica Neue, Helvetica, Arial,
sans-serif; font-size: 13px;"><br class="">
</div>
<div class="ydp626bf091yahoo-style-wrap"
style="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.Â
Thanks.</div>
<div class="ydp626bf091yahoo-style-wrap"
style="font-family: Helvetica Neue, Helvetica, Arial,
sans-serif; font-size: 13px;"><br class="">
</div>
<div class="ydp626bf091yahoo-style-wrap"
style="font-family: Helvetica Neue, Helvetica, Arial,
sans-serif; font-size: 13px;">Jack Wheeler<br class="">
</div>
</div>
_______________________________________________<br class="">
<br class="">
<a href="mailto:Mgs@autox.team.net"; class=""
moz-do-not-send="true">Mgs@autox.team.net</a><br class="">
Donate: <a class="moz-txt-link-freetext"
href="http://www.team.net/donate.html";>http://www.team.net/donate.html</a><br
class="">
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<br class="">
Archive: <a class="moz-txt-link-freetext"
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class="">
</div>
</blockquote>
</div>
<br class="">
<br>
<fieldset class="mimeAttachmentHeader"></fieldset>
<pre class="moz-quote-pre"
wrap="">_______________________________________________
<a class="moz-txt-link-abbreviated"
href="mailto:Mgs@autox.team.net";>Mgs@autox.team.net</a>
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</pre>
</blockquote>
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