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Quantum mechanics used to recommend 30W
non detergent oil and it always worked well for us.
We are putting together a TR6 w/ Odr and I decided=20
to check in to see if that had changed and their new
recommendation is Redline MT 90 75w90 GL4.
drove the car once and the OD shifted well.=20
art at riverside sports cars.
From: Jack Wheeler via Mgs=20
Sent: Friday, January 18, 2019 10:32 AM
To: Osborne, Paul=20
Cc: Mglist=20
Subject: Re: [Mgs] Overdrive Diagram
Hi Paul. You are correct, I removed the low pressure valve, NOT the =
pump assembly. I was looking at the manual and the parts which came out =
appeared to be closer to those shown as the pump assembly, but neither =
was the same as mine. That's how I assumed it was the pump assembly.
So, now that I have the low pressure valve installed properly, the =
overdrive still does not engage. The other thing I changed was the gear =
oil. I always used straight 50 Wt. motor oil in my overdrives, and that =
worked fine. Based on a recent article in the Tech Issue of "MG Driver" =
magazine, I switched to EP 85/90 GL-4 gear oil. Do you think this could =
be causing the problem?
Thanks for your help.
Jack
On Thursday, January 17, 2019, 10:38:25 PM EST, Osborne, Paul =
<paul@ece.rochester.edu> wrote:=20
Hi Jack, hum, a few things I might be a able to help. I have been =
build/repair the Laycock OD units and transmissions for a some time, for =
MGS and Triumphs and Jaguar. I have seen a good number. I do not claim =
to be the last word on these. Some info about your unit may help. 1971 =
MGB is it orig to the car? =20
If so it should be a black label LH unit mated to a full synchro 4 Spd =
trans. The pump assy. Is located in the sump, not visible from the =
outside housing unless the sump is removed. All have a roller in the end =
as that is running on the input shaft which has a pump cam. Is that what =
you removed? If that is not what you removed, but you removed the large =
nut just nest to the solenoid cover(black label) that is the pressure =
valve. There is not roller on that plunger. Let=E2=80=99s stop there =
for now and let me know if this is what was removed. =20
Paul
On Jan 17, 2019, at 2:13 PM, Jack Wheeler via Mgs <mgs@autox.team.net> =
wrote:
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. 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
_______________________________________________
Mgs@autox.team.net
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kyvKwrY2Ykb1ZhT9BlYPU53g&e=3D
Paul Osborne
Department of Electrical and Computer Engineering
University of Rochester
201 Hopeman Building RC
Rochester, NY 14627
585-275-5226
-------------------------------------------------------------------------=
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Archive: http://www.team.net/pipermail/mgs
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<HTML><HEAD></HEAD>
<BODY dir=3Dltr>
<DIV dir=3Dltr>
<DIV style=3D"FONT-SIZE: 12pt; FONT-FAMILY: 'Calibri'; COLOR: #000000">
<DIV>Quantum mechanics used to recommend 30W</DIV>
<DIV>non detergent oil and it always worked well for us.</DIV>
<DIV>We are putting together a TR6 w/ Odr and I decided </DIV>
<DIV>to check in to see if that had changed and their new</DIV>
<DIV>recommendation is Redline MT 90 75w90 GL4.</DIV>
<DIV> </DIV>
<DIV>drove the car once and the OD shifted well. </DIV>
<DIV> </DIV>
<DIV>art at riverside sports cars.</DIV>
<DIV=20
style=3D'FONT-SIZE: small; TEXT-DECORATION: none; FONT-FAMILY: =
"Calibri"; FONT-WEIGHT: normal; COLOR: #000000; FONT-STYLE: normal; =
DISPLAY: inline'>
<DIV style=3D"FONT: 10pt tahoma">
<DIV> </DIV>
<DIV style=3D"BACKGROUND: #f5f5f5">
<DIV style=3D"font-color: black"><B>From:</B> <A =
title=3Dmgs@autox.team.net=20
href=3D"mailto:mgs@autox.team.net";>Jack Wheeler via Mgs</A> </DIV>
<DIV><B>Sent:</B> Friday, January 18, 2019 10:32 AM</DIV>
<DIV><B>To:</B> <A title=3Dpaul@ece.rochester.edu=20
href=3D"mailto:paul@ece.rochester.edu";>Osborne, Paul</A> </DIV>
<DIV><B>Cc:</B> <A title=3Dmgs@autox.team.net=20
href=3D"mailto:mgs@autox.team.net";>Mglist</A> </DIV>
<DIV><B>Subject:</B> Re: [Mgs] Overdrive Diagram</DIV></DIV></DIV>
<DIV> </DIV></DIV>
<DIV=20
style=3D'FONT-SIZE: small; TEXT-DECORATION: none; FONT-FAMILY: =
"Calibri"; FONT-WEIGHT: normal; COLOR: #000000; FONT-STYLE: normal; =
DISPLAY: inline'>
<DIV class=3Dydp836d150eyahoo-style-wrap=20
style=3D"FONT-SIZE: 13px; FONT-FAMILY: helvetica neue, helvetica, arial, =
sans-serif">
<DIV></DIV>
<DIV>Hi Paul. You are correct, I removed the low pressure valve, =
NOT the=20
pump assembly. I was looking at the manual and the parts which =
came out=20
appeared to be closer to those shown as the pump assembly, but neither =
was the=20
same as mine. That's how I assumed it was the pump assembly.</DIV>
<DIV> </DIV>
<DIV>So, now that I have the low pressure valve installed properly, the=20
overdrive still does not engage. The other thing I changed was the =
gear=20
oil. I always used straight 50 Wt. motor oil in my overdrives, and =
that=20
worked fine. Based on a recent article in the Tech Issue of "MG =
Driver"=20
magazine, I switched to EP 85/90 GL-4 gear oil. Do you think this =
could be=20
causing the problem?</DIV>
<DIV> </DIV>
<DIV>Thanks for your help.</DIV>
<DIV> </DIV>
<DIV>Jack<BR></DIV>
<DIV> </DIV></DIV>
<DIV id=3Dydpe26716e7yahoo_quoted_8602960656 =
class=3Dydpe26716e7yahoo_quoted>
<DIV=20
style=3D"FONT-SIZE: 13px; FONT-FAMILY: 'Helvetica Neue', helvetica, =
arial, sans-serif; COLOR: #26282a">
<DIV>On Thursday, January 17, 2019, 10:38:25 PM EST, Osborne, Paul=20
<paul@ece.rochester.edu> wrote: </DIV>
<DIV> </DIV>
<DIV> </DIV>
<DIV>
<DIV id=3Dydpe26716e7yiv7383493621>
<DIV>Hi Jack, hum, a few things I might be a able to help. I have been=20
build/repair the Laycock OD units and transmissions for a some time, for =
MGS and=20
Triumphs and Jaguar. I have seen a good number. I do not claim to be the =
last=20
word on these. Some info about your unit may help. 1971 MGB =
is=20
it orig to the car? =20
<DIV class=3Dydpe26716e7yiv7383493621>If so it should be a black label =
LH unit=20
mated to a full synchro 4 Spd trans. The pump assy. Is located in the =
sump, not=20
visible from the outside housing unless the sump is removed. All have a =
roller=20
in the end as that is running on the input shaft which has a pump cam. =
Is that=20
what you removed? If that is not what you removed, but you removed the =
large nut=20
just nest to the solenoid cover(black label) that is the pressure valve. =
There=20
is not roller on that plunger. Let=E2=80=99s stop there for now =
and let me know if=20
this is what was removed. </DIV>
<DIV class=3Dydpe26716e7yiv7383493621> </DIV>
<DIV class=3Dydpe26716e7yiv7383493621>Paul</DIV>
<DIV class=3Dydpe26716e7yiv7383493621> </DIV>
<DIV class=3Dydpe26716e7yiv7383493621>
<DIV> </DIV>
<DIV><BR class=3Dydpe26716e7yiv7383493621 clear=3Dnone>
<BLOCKQUOTE class=3Dydpe26716e7yiv7383493621 type=3D"cite">
<DIV id=3Dydpe26716e7yiv7383493621yqt20554=20
class=3Dydpe26716e7yiv7383493621yqt5330100593>
<DIV class=3Dydpe26716e7yiv7383493621>On Jan 17, 2019, at 2:13 PM, =
Jack Wheeler=20
via Mgs <<A class=3Dydpe26716e7yiv7383493621 =
href=3D"mailto:mgs@autox.team.net"=20
shape=3Drect rel=3Dnofollow target=3D_blank>mgs@autox.team.net</A>> =
wrote:</DIV>
<DIV> </DIV>
<DIV class=3Dydpe26716e7yiv7383493621>
<DIV class=3Dydpe26716e7yiv7383493621>
<DIV class=3Dydpe26716e7yiv7383493621ydp626bf091yahoo-style-wrap=20
style=3D"FONT-SIZE: 13px; FONT-FAMILY: helvetica neue, helvetica, =
arial, sans-serif">Does=20
anyone have a good exploded diagram of the overdrive unit used in a =
1971 MGB,=20
that you could send to me? I am particularly interested in the =
pump=20
assembly. I changed the oil in my gearbox this week, using EP =
85/90 GL-4=20
gear oil, as recommended in a recent article in the MG Driver =
magazine.</DIV>
<DIV class=3Dydpe26716e7yiv7383493621ydp626bf091yahoo-style-wrap=20
style=3D"FONT-SIZE: 13px; FONT-FAMILY: helvetica neue, helvetica, =
arial, sans-serif"> </DIV>
<DIV class=3Dydpe26716e7yiv7383493621ydp626bf091yahoo-style-wrap=20
style=3D"FONT-SIZE: 13px; FONT-FAMILY: helvetica neue, helvetica, =
arial, sans-serif">While=20
the car was up in the air, I noticed a leak around the plug which =
holds the=20
pump assembly in place. So, I removed the pump, careful to keep =
all the=20
pieces in the order in which they came out. I cleaned everything =
up, and=20
reinstalled the pump assembly and plug (part number 466-315 in the =
Moss=20
catalog), with a new gasket. I thought I had all of the pieces =
of the=20
pump assembly (items 62-66 in the Moss diagram) in the right order =
when I=20
reinstalled it, but when I took the car out for a test drive, the =
overdrive=20
would not engage.</DIV>
<DIV class=3Dydpe26716e7yiv7383493621ydp626bf091yahoo-style-wrap=20
style=3D"FONT-SIZE: 13px; FONT-FAMILY: helvetica neue, helvetica, =
arial, sans-serif"> </DIV>
<DIV class=3Dydpe26716e7yiv7383493621ydp626bf091yahoo-style-wrap=20
style=3D"FONT-SIZE: 13px; FONT-FAMILY: helvetica neue, helvetica, =
arial, sans-serif">In=20
addition to trying to keep the pieces in the order in which they came =
out, I=20
also used the exploded diagram in the Moss catalog (Page 41) as a =
guide. =20
The Moss diagram, however, is different than my overdrive unit. =
Moss=20
says their diagram is for cars from 1968 to 1980, but apparently, some =
things=20
were changed during that time frame. I can't believe the =
engineers would=20
let anything go unchanged for 12 years! It looks like the =
plunger (Moss=20
part number 466-305) shown in the Moss catalog diagram has a roller on =
the end=20
of it. My plunger does not have a roller on the end of it. =
Maybe=20
this will give you a lead to which diagram I am looking for.<BR=20
class=3Dydpe26716e7yiv7383493621 clear=3Dnone></DIV>
<DIV class=3Dydpe26716e7yiv7383493621ydp626bf091yahoo-style-wrap=20
style=3D"FONT-SIZE: 13px; FONT-FAMILY: helvetica neue, helvetica, =
arial, sans-serif"> </DIV>
<DIV class=3Dydpe26716e7yiv7383493621ydp626bf091yahoo-style-wrap=20
style=3D"FONT-SIZE: 13px; FONT-FAMILY: helvetica neue, helvetica, =
arial, sans-serif">So,=20
that leaves me looking for a good exploded diagram of the unit used in =
a 1971=20
model. Can anyone help with that, or does anyone have any =
suggestions as=20
to what I might have done to make the overdrive not work, when it has =
always=20
worked fine. Thanks.</DIV>
<DIV class=3Dydpe26716e7yiv7383493621ydp626bf091yahoo-style-wrap=20
style=3D"FONT-SIZE: 13px; FONT-FAMILY: helvetica neue, helvetica, =
arial, sans-serif"> </DIV>
<DIV class=3Dydpe26716e7yiv7383493621ydp626bf091yahoo-style-wrap=20
style=3D"FONT-SIZE: 13px; FONT-FAMILY: helvetica neue, helvetica, =
arial, sans-serif">Jack=20
Wheeler<BR class=3Dydpe26716e7yiv7383493621=20
=
clear=3Dnone></DIV></DIV>_______________________________________________<=
BR=20
class=3Dydpe26716e7yiv7383493621 clear=3Dnone><BR =
class=3Dydpe26716e7yiv7383493621=20
clear=3Dnone><A class=3Dydpe26716e7yiv7383493621 =
href=3D"mailto:Mgs@autox.team.net"=20
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class=3Dydpe26716e7yiv7383493621 clear=3Dnone>Donate:=20
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<DIV> </DIV>
<DIV class=3Dydpe26716e7yiv7383493621>
<DIV class=3Dydpe26716e7yiv7383493621>
<DIV=20
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LETTER-SPACING: normal; TEXT-INDENT: 0px">Paul=20
Osborne<BR class=3Dydpe26716e7yiv7383493621 clear=3Dnone>Department of =
Electrical=20
and Computer Engineering<BR class=3Dydpe26716e7yiv7383493621 =
clear=3Dnone>University=20
of Rochester<BR class=3Dydpe26716e7yiv7383493621 clear=3Dnone>201 =
Hopeman Building=20
RC<BR class=3Dydpe26716e7yiv7383493621 clear=3Dnone>Rochester, NY =
14627<BR=20
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