Subject: Re: [TR] Triumphs Digest, Vol 9, Issue 136

From: Stuart Greenwood <[email-masked]>
Date: Sat, 11 Jun 2016 01:10:10 +0000 (UTC)

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=C2=A0In sounds like this is a=C2=A0 J type overdrive whereas I would have =
thought that it would be an A type.=C2=A0 I say this because messing about =
with the pump on an A type would not necessarily change the oil pressure wh=
ereas on a J type it would.=C2=A0 The pressure on a A type is controlled by=
 the accumulator piston spring. I don't=C2=A0no whether=C2=A0you can get 50=
0 psi on an old A type overdrive. The overdrive is not working properly bec=
ause the brake ring is slipping. I think that the=C2=A0pistons that apply t=
he force to the brake ring may be leaking.=C2=A0 Just because the pressure =
relief valve=C2=A0 on the pump has be reseated doesn't mean the relief pres=
sure is correct. The spring might be weak.=C2=A0 I strongly suggest that yo=
u read the overdrive information on the Buckeye web site.=20
Stuart A Greenwood=20

    On Friday, June 10, 2016 4:37 PM, "[email-masked]" <tr=
[email-masked]> wrote:
=20

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Send Triumphs mailing list submissions to
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When replying, please edit your Subject line so it is more specific
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Today's Topics:

=C2=A0 1. Overdrive issues (Rye Livingston)
Transmission update - for those reading about this for the first time, this=
 is a 1960 TR3 with a TR4 OD transmission. Yesterday they said it's basical=
ly a TR250 transmission. The whole transmission and OD was rebuilt by=C2=A0=
a British car specialist of 40+ years. =C2=A0His employee has also been wor=
king on British cars for years, and is a transmission specialist. =C2=A0The=
y've rebuilt literally 100s of transmissions and ODs. =C2=A0They had 4 OD c=
ores on their bench as they were showing me different parts of the system.
Symptom -=C2=A0when I'm accelerating and flip the switch for OD, it doesn't=
 go into OD until I let up. =C2=A0When in 2-3 or 4th gear, OD engaged, and =
punch it, it will downshift like an automatic transmission while I accelera=
te, then shift back into OD when I let up.
I'm not technical enough to know how to describe all what they told me, but=
 I'll try. =C2=A0First off, I forwarded the comments when I posted this iss=
ue a couple of weeks=C2=A0ago, and keep in mind it's not the easy/obvious t=
hings. =C2=A0They've checked all the electrical, solenoids, ground, oil typ=
e, etc. =C2=A0When in OD it's not slipping. =C2=A0They've tested the PSI wi=
th a gauge attached while driving down the expressway, and jacked up with t=
he wheels off the ground. =C2=A0
The issue is that it's not getting high enough PSI. =C2=A0It's over 400 PSI=
, but it needs to be 490 to over 500, I think they said 520. =C2=A0They've =
taken the transmission back out, taken the OD all apart, and there's nothin=
g obvious. They've changed the piston in the pump. Originally it had a pump=
 that would shift softer because I've got a torquey engine and the other pu=
mp, which they called a competition pump, would be hard on the differential=
, but they've got that one in the car now. =C2=A0 They showed me a seal tha=
t goes around that piston and said the new seals=C2=A0are=C2=A0rubber and t=
hey got one like the original style that has some sort of metal reinforceme=
nt in it to hopefully make a better seal. =C2=A0Not very clear I know, but =
hopefully that=C2=A0makes sense. =C2=A0They've checked the seats where a sm=
all ball bearing must make a perfect seal, they all look perfect. =C2=A0The=
y said everything looks absolutely pristine. =C2=A0No scoring down passagew=
ays that might not allow maximum PSI, etc. =C2=A0They also showed me the li=
ning on a=C2=A0Sun gear they had on the beach, and said mine looked good an=
d the rivets looked original.=C2=A0They put it all back together, went for =
a test drive, and that didn't fix it.

They've spent literally 20+ hours on this transmission, plus several more h=
ours doing internet research on the problem. =C2=A0As they described everyt=
hing and what they've checked, which seems like everything, I said I'd send=
 out this email to the list. =C2=A0Not that they haven't tried everything, =
but I'm hoping there may be one little nugget of info they haven't tried, o=
r a test they can run, that will=C2=A0lead to the solution.
Thanks,
Rye Livingston
Triumph Travelers Sports Car ClubActivities Chairman1960 TR3APH: 530-FIND-R=
YE
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<html><head></head><body><div style=3D"color:#000; background-color:#fff; f=
ont-family:times new roman, new york, times, serif;font-size:14px"><div><sp=
an></span></div><div></div><div id=3D"yui_3_16_0_ym19_1_1465605995944_4042"=
 dir=3D"ltr">&nbsp;In sounds like this is a&nbsp; J type overdrive whereas =
I would have thought that it would be an A type.&nbsp; I say this because m=
essing about with the pump on an A type would not necessarily change the oi=
l pressure whereas on a J type it would.&nbsp; The pressure on a A type is =
controlled by the accumulator piston spring. I don't&nbsp;no whether&nbsp;y=
ou can get 500 psi on an old A type overdrive. </div><div id=3D"yui_3_16_0_=
ym19_1_1465605995944_4145" dir=3D"ltr">The overdrive is not working properl=
y because the brake ring is slipping. I think that the&nbsp;pistons that ap=
ply the force to the brake ring may be leaking.&nbsp; Just because the pres=
sure relief valve&nbsp; on the pump has be reseated doesn't mean the relief=
 pressure is correct. The spring might be weak.&nbsp; I strongly suggest th=
at you read the overdrive information on the Buckeye web site. </div><div i=
d=3D"yui_3_16_0_ym19_1_1465605995944_4259" dir=3D"ltr"><br></div><div class=
=3D"signature" id=3D"yui_3_16_0_ym19_1_1465605995944_4041">Stuart A Greenwo=
od</div> <div class=3D"qtdSeparateBR"><br><br></div><div class=3D"yahoo_quo=
ted" style=3D"display: block;"> <div style=3D"font-family: times new roman,=
 new york, times, serif; font-size: 14px;"> <div style=3D"font-family: Helv=
eticaNeue, Helvetica Neue, Helvetica, Arial, Lucida Grande, sans-serif; fon=
t-size: 16px;"> <div dir=3D"ltr"><font face=3D"Arial" size=3D"2"> On Friday=
, June 10, 2016 4:37 PM, "[email-masked]" &lt;triumphs-req=
[email-masked]&gt; wrote:<br></font></div>  <br><br> <div class=3D"y_m=
sg_container">----- Forwarded Message -----<br><br>Send Triumphs mailing li=
st submissions to<br>&nbsp;&nbsp;&nbsp; <a href=3D"mailto:[email-masked]=
am.net" ymailto=3D"mailto:[email-masked]">[email-masked]<=
/a><br><br>To subscribe or unsubscribe via the World Wide Web, visit<br>&nb=
sp;&nbsp;&nbsp; <a href=3D"http://autox.team.net/mailman/listinfo/triumphs"=
 target=3D"_blank">http://autox.team.net/mailman/listinfo/triumphs</a><br>o=
r, via email, send a message with subject or body 'help' to<br>&nbsp;&nbsp;=
&nbsp; <a href=3D"mailto:[email-masked]" ymailto=3D"mailto=
:[email-masked]">[email-masked]</a><br><b=
r>You can reach the person managing the list at<br>&nbsp;&nbsp;&nbsp; <a hr=
ef=3D"mailto:[email-masked]" ymailto=3D"mailto:triumphs-owne=
[email-masked]">[email-masked]</a><br><br>When replying, p=
lease edit your Subject line so it is more specific<br>than "Re: Contents o=
f Triumphs digest..."<br><br>Today's Topics:<br><br>&nbsp;  1. Overdrive is=
sues (Rye Livingston)<br><div id=3D"yiv2451987180"><div><div>Transmission u=
pdate - for those reading about this for the first time, this is a 1960 TR3=
 with a TR4 OD transmission. Yesterday they said it's basically a TR250 tra=
nsmission. The whole transmission and OD was rebuilt by&nbsp;a British car =
specialist of 40+ years. &nbsp;His employee has also been working on Britis=
h cars for years, and is a transmission specialist. &nbsp;They've rebuilt l=
iterally 100s of transmissions and ODs. &nbsp;They had 4 OD cores on their =
bench as they were showing me different parts of the system.</div><div><br>=
</div><div>Symptom -&nbsp;when I'm accelerating and flip the switch for OD,=
 it doesn't go into OD until I let up. &nbsp;When in 2-3 or 4th gear, OD en=
gaged, and punch it, it will downshift like an automatic transmission while=
 I accelerate, then shift back into OD when I let up.</div><div><br></div><=
div>I'm not technical enough to know how to describe all what they told me,=
 but I'll try. &nbsp;First off, I forwarded the comments when I posted this=
 issue a couple of weeks&nbsp;ago, and keep in mind it's not the easy/obvio=
us things. &nbsp;They've checked all the electrical, solenoids, ground, oil=
 type, etc. &nbsp;When in OD it's not slipping. &nbsp;They've tested the PS=
I with a gauge attached while driving down the expressway, and jacked up wi=
th the wheels off the ground. &nbsp;</div><div><br></div><div>The issue is =
that it's not getting high enough PSI. &nbsp;It's over 400 PSI, but it need=
s to be 490 to over 500, I think they said 520. &nbsp;They've taken the tra=
nsmission back out, taken the OD all apart, and there's nothing obvious. Th=
ey've changed the piston in the pump. Originally it had a pump that would s=
hift softer because I've got a torquey engine and the other pump, which the=
y called a competition pump, would be hard on the differential, but they've=
 got that one in the car now. &nbsp; They showed me a seal that goes around=
 that piston and said the new seals&nbsp;are&nbsp;rubber and they got one l=
ike the original style that has some sort of metal reinforcement in it to h=
opefully make a better seal. &nbsp;Not very clear I know, but hopefully tha=
t&nbsp;makes sense. &nbsp;They've checked the seats where a small ball bear=
ing must make a perfect seal, they all look perfect. &nbsp;They said everyt=
hing looks absolutely pristine. &nbsp;No scoring down passageways that migh=
t not allow maximum PSI, etc. &nbsp;They also showed me the lining on a&nbs=
p;Sun gear they had on the beach, and said mine looked good and the rivets =
looked original.&nbsp;They put it all back together, went for a test drive,=
 and that didn't fix it.<br></div><div><br></div><div>They've spent literal=
ly 20+ hours on this transmission, plus several more hours doing internet r=
esearch on the problem. &nbsp;As they described everything and what they've=
 checked, which seems like everything, I said I'd send out this email to th=
e list. &nbsp;Not that they haven't tried everything, but I'm hoping there =
may be one little nugget of info they haven't tried, or a test they can run=
, that will&nbsp;lead to the solution.</div><div><br></div><div>Thanks,</di=
v><div><br></div><div>Rye Livingston<br></div><div>Triumph Travelers Sports=
 Car Club</div><div>Activities Chairman</div><div>1960 TR3A</div><div>PH: 5=
30-FIND-RYE</div></div></div><br>__________________________________________=
_____<br><br>Triumphs mailing list<br><a href=3D"mailto:[email-masked]=
.net" ymailto=3D"mailto:[email-masked]">[email-masked]</a=
><br><a href=3D"http://autox.team.net/mailman/listinfo/triumphs" target=3D"=
_blank">http://autox.team.net/mailman/listinfo/triumphs</a><br><br><br></di=
v>  </div> </div>  </div></div></body></html>
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