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Hi Paul.=C2=A0 You are correct, I removed the low pressure valve, NOT the =
pump assembly.=C2=A0 I was looking at the manual and the parts which came o=
ut appeared to be closer to those shown as the pump assembly, but neither w=
as the same as mine.=C2=A0 That's how I assumed it was the pump assembly.
So, now that I have the low pressure valve installed properly, the overdriv=
e still does not engage.=C2=A0 The other thing I changed was the gear oil.=
=C2=A0 I always used straight 50 Wt. motor oil in my overdrives, and that w=
orked fine.=C2=A0 Based on a recent article in the Tech Issue of "MG Driver=
" magazine, I switched to EP 85/90 GL-4 gear oil.=C2=A0 Do you think this c=
ould 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
=20
Hi Jack, hum, a few things I might be a able to help. I have been build/re=
pair the Laycock OD units and transmissions for a some time, for MGS and Tr=
iumphs and Jaguar. I have seen a good number. I do not claim to be the last=
word on these. =C2=A0 Some info about your unit may help. 1971 MGB is it =
=C2=A0orig to the car?=C2=A0If 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 v=
isible from the outside housing unless the sump is removed. All have a roll=
er in the end as that is running on the input shaft which has a pump cam. I=
s that what you removed? If that is not what you removed, but you removed t=
he large nut just nest to the solenoid cover(black label) that is the press=
ure valve. There is not roller on that plunger. =C2=A0Let=E2=80=99s stop th=
ere for now and let me know if this is what was removed. =C2=A0
Paul
On Jan 17, 2019, at 2:13 PM, Jack Wheeler via Mgs <mgs@autox.team.net> wrot=
e:
Does anyone have a good exploded diagram of the overdrive unit used in a 19=
71 MGB, that you could send to me?=C2=A0 I am particularly interested in th=
e pump assembly.=C2=A0 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 ma=
gazine.
While the car was up in the air, I noticed a leak around the plug which hol=
ds the pump assembly in place.=C2=A0 So, I removed the pump, careful to kee=
p all the pieces in the order in which they came out.=C2=A0 I cleaned every=
thing up, and reinstalled the pump assembly and plug (part number 466-315 i=
n the Moss catalog), with a new gasket.=C2=A0 I thought I had all of the pi=
eces of the pump assembly (items 62-66 in the Moss diagram) in the right or=
der when I reinstalled it, but when I took the car out for a test drive, th=
e overdrive would not engage.
In addition to trying to keep the pieces in the order in which they came ou=
t, I also used the exploded diagram in the Moss catalog (Page 41) as a guid=
e.=C2=A0 The Moss diagram, however, is different than my overdrive unit.=C2=
=A0 Moss says their diagram is for cars from 1968 to 1980, but apparently, =
some things were changed during that time frame.=C2=A0 I can't believe the =
engineers would let anything go unchanged for 12 years!=C2=A0 It looks like=
the plunger (Moss part number 466-305) shown in the Moss catalog diagram h=
as a roller on the end of it.=C2=A0 My plunger does not have a roller on th=
e end of it.=C2=A0 Maybe this will give you a lead to which diagram I am lo=
oking for.
So, that leaves me looking for a good exploded diagram of the unit used in =
a 1971 model.=C2=A0 Can anyone help with that, or does anyone have any sugg=
estions as to what I might have done to make the overdrive not work, when i=
t has always worked fine.=C2=A0 Thanks.
Jack Wheeler
_______________________________________________
Mgs@autox.team.net
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dteHFkyvKwrY2Ykb1ZhT9BlYPU53g&e=3D
Paul Osborne
Department of Electrical and=C2=A0Computer Engineering
University of Rochester
201 Hopeman Building RC
Rochester, NY 14627
585-275-5226
=20
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<html><head></head><body><div class=3D"ydp836d150eyahoo-style-wrap" style=
=3D"font-family:Helvetica Neue, Helvetica, Arial, sans-serif;font-size:13px=
;"><div></div>
<div>Hi Paul. You are correct, I removed the low pressure val=
ve, 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, b=
ut neither was the same as mine. That's how I assumed it was the pump=
assembly.</div><div><br></div><div>So, now that I have the low pressure va=
lve installed properly, the overdrive still does not engage. The othe=
r thing I changed was the gear oil. I always used straight 50 Wt. mot=
or oil in my overdrives, and that worked fine. Based on a recent arti=
cle 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?</div><div><=
br></div><div>Thanks for your help.</div><div><br></div><div>Jack<br></div>=
<div><br></div>
=20
</div><div id=3D"ydpe26716e7yahoo_quoted_8602960656" class=3D"ydpe2=
6716e7yahoo_quoted">
<div style=3D"font-family:'Helvetica Neue', Helvetica, Arial, s=
ans-serif;font-size:13px;color:#26282a;">
=20
<div>
On Thursday, January 17, 2019, 10:38:25 PM EST, Osborne=
, Paul <paul@ece.rochester.edu> wrote:
</div>
<div><br></div>
<div><br></div>
<div><div id=3D"ydpe26716e7yiv7383493621"><div>
Hi Jack, hum, a few things I might be a able to help. I have been build/rep=
air the Laycock OD units and transmissions for a some time, for MGS and Tri=
umphs 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?
<div class=3D"ydpe26716e7yiv7383493621">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 plunge=
r. Let=E2=80=99s stop there for now and
let me know if this is what was removed. </div>
<div class=3D"ydpe26716e7yiv7383493621"><br class=3D"ydpe26716e7yiv73834936=
21" clear=3D"none">
</div>
<div class=3D"ydpe26716e7yiv7383493621">Paul</div>
<div class=3D"ydpe26716e7yiv7383493621"><br class=3D"ydpe26716e7yiv73834936=
21" clear=3D"none">
</div>
<div class=3D"ydpe26716e7yiv7383493621"><br class=3D"ydpe26716e7yiv73834936=
21" clear=3D"none">
<div><br class=3D"ydpe26716e7yiv7383493621" clear=3D"none">
<blockquote class=3D"ydpe26716e7yiv7383493621" type=3D"cite">
<div class=3D"ydpe26716e7yiv7383493621yqt5330100593" id=3D"ydpe26716e7yiv73=
83493621yqt20554"><div class=3D"ydpe26716e7yiv7383493621">On Jan 17, 2019, =
at 2:13 PM, Jack Wheeler via Mgs <<a shape=3D"rect" class=3D"ydpe26716e7=
yiv7383493621" href=3D"mailto:mgs@autox.team.net"; rel=3D"nofollow" target=
=3D"_blank">mgs@autox.team.net</a>> wrote:</div>
<br class=3D"ydpe26716e7yiv7383493621Apple-interchange-newline" clear=3D"no=
ne">
<div class=3D"ydpe26716e7yiv7383493621">
<div class=3D"ydpe26716e7yiv7383493621">
<div class=3D"ydpe26716e7yiv7383493621ydp626bf091yahoo-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 19=
71 MGB, that you could send to me? I am particularly interested in th=
e 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"ydpe26716e7yiv7383493621ydp626bf091yahoo-style-wrap" style=3D=
"font-family:Helvetica Neue, Helvetica, Arial, sans-serif;font-size:13px;">
<br class=3D"ydpe26716e7yiv7383493621" clear=3D"none">
</div>
<div class=3D"ydpe26716e7yiv7383493621ydp626bf091yahoo-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 hol=
ds the pump assembly in place. So, I removed the pump, careful to kee=
p all the pieces in the order in which they came out. I cleaned every=
thing up, and reinstalled the pump assembly
and plug (part number 466-315 in the Moss catalog), with a new gasket.&nbs=
p; I thought I had all of the pieces of the pump assembly (items 62-66 in t=
he 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"ydpe26716e7yiv7383493621ydp626bf091yahoo-style-wrap" style=3D=
"font-family:Helvetica Neue, Helvetica, Arial, sans-serif;font-size:13px;">
<br class=3D"ydpe26716e7yiv7383493621" clear=3D"none">
</div>
<div class=3D"ydpe26716e7yiv7383493621ydp626bf091yahoo-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 ou=
t, I also used the exploded diagram in the Moss catalog (Page 41) as a guid=
e. The Moss diagram, however, is different than my overdrive unit.&nb=
sp; Moss says their diagram is for cars from
1968 to 1980, but apparently, some things were changed during that time fr=
ame. I can't believe the engineers would let anything go unchanged fo=
r 12 years! It looks like the plunger (Moss part number 466-305) show=
n 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"ydpe26716e7yiv7383493621" clear=3D"none">
</div>
<div class=3D"ydpe26716e7yiv7383493621ydp626bf091yahoo-style-wrap" style=3D=
"font-family:Helvetica Neue, Helvetica, Arial, sans-serif;font-size:13px;">
<br class=3D"ydpe26716e7yiv7383493621" clear=3D"none">
</div>
<div class=3D"ydpe26716e7yiv7383493621ydp626bf091yahoo-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 sugg=
estions as to what I might have done to make the overdrive not work, when i=
t has always worked fine. Thanks.</div>
<div class=3D"ydpe26716e7yiv7383493621ydp626bf091yahoo-style-wrap" style=3D=
"font-family:Helvetica Neue, Helvetica, Arial, sans-serif;font-size:13px;">
<br class=3D"ydpe26716e7yiv7383493621" clear=3D"none">
</div>
<div class=3D"ydpe26716e7yiv7383493621ydp626bf091yahoo-style-wrap" style=3D=
"font-family:Helvetica Neue, Helvetica, Arial, sans-serif;font-size:13px;">
Jack Wheeler<br class=3D"ydpe26716e7yiv7383493621" clear=3D"none">
</div>
</div>
_______________________________________________<br class=3D"ydpe26716e7yiv7=
383493621" clear=3D"none">
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lass=3D"ydpe26716e7yiv7383493621" clear=3D"none">
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a3u6kog3A&e=3D<br class=3D"ydpe26716e7yiv7383493621" clear=3D"none">
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</div></div>
</blockquote>
</div>
<br class=3D"ydpe26716e7yiv7383493621" clear=3D"none">
<div class=3D"ydpe26716e7yiv7383493621">
<div class=3D"ydpe26716e7yiv7383493621">
<div style=3D"color:rgb(0, 0, 0);font-family:Helvetica;font-size:14px;font-=
style:normal;font-weight:normal;letter-spacing:normal;text-indent:0px;text-=
transform:none;white-space:normal;word-spacing:0px;text-decoration:none;">
Paul Osborne<br class=3D"ydpe26716e7yiv7383493621" clear=3D"none">
Department of Electrical and Computer Engineering<br class=3D"ydpe2671=
6e7yiv7383493621" clear=3D"none">
University of Rochester<br class=3D"ydpe26716e7yiv7383493621" clear=3D"none=
">
201 Hopeman Building RC<br class=3D"ydpe26716e7yiv7383493621" clear=3D"none=
">
Rochester, NY 14627<br class=3D"ydpe26716e7yiv7383493621" clear=3D"none">
<br class=3D"ydpe26716e7yiv7383493621" clear=3D"none">
585-275-5226<br class=3D"ydpe26716e7yiv7383493621" clear=3D"none">
<br class=3D"ydpe26716e7yiv7383493621" clear=3D"none">
</div>
</div>
</div>
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</div>
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