[TR] Overdrive issues

Brian Induni binduni at gmail.com
Sun Jun 12 10:08:54 MDT 2016


Rye, I am having the EXACT same issue with my 1963 MGB! Same symptoms and
same checks all resulting the same scratching of head. Obviously a
different gearbox and OD unit, so there must be some similarities between
OD units or wiring or something.

Really hoping the list has some suggestions!

Brian




>
>
> ----------------------------------------------------------------------
>
> Message: 1
> Date: Fri, 10 Jun 2016 15:50:18 +0000 (GMT)
> From: Rye Livingston <ryel at mac.com>
> To: triumph list list <triumphs at autox.team.net>, TTSCC TTSCC
>         <TTSCC at yahoogroups.com>
> Subject: [TR] Overdrive issues
> Message-ID: <06d9f0a1-bc70-4a33-9f47-9150424d7930 at me.com>
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> 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
> basically a TR250 transmission. The whole transmission and OD was rebuilt
> by?a British car specialist of 40+ years. ?His employee has also been
> working on British cars for years, and is a transmission specialist.
> ?They've rebuilt literally 100s of transmissions and ODs. ?They had 4 OD
> cores on their bench as they were showing me different parts of the system.
>
> Symptom -?when I'm accelerating and flip the switch for OD, it doesn't go
> into OD until I let up. ?When in 2-3 or 4th gear, OD engaged, and punch it,
> it will downshift like an automatic transmission while I accelerate, 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. ?First off, I forwarded the comments when I posted this issue
> a couple of weeks?ago, and keep in mind it's not the easy/obvious things.
> ?They've checked all the electrical, solenoids, ground, oil type, etc.
> ?When in OD it's not slipping. ?They've tested the PSI with a gauge
> attached while driving down the expressway, and jacked up with the wheels
> off the ground. ?
>
> The issue is that it's not getting high enough PSI. ?It's over 400 PSI,
> but it needs to be 490 to over 500, I think they said 520. ?They've taken
> the transmission back out, taken the OD all apart, and there's nothing
> 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
> pump, which they called a competition pump, would be hard on the
> differential, but they've got that one in the car now. ? They showed me a
> seal that goes around that piston and said the new seals?are?rubber and
> they got one like the original style that has some sort of metal
> reinforcement in it to hopefully make a better seal. ?Not very clear I
> know, but hopefully that?makes sense. ?They've checked the seats where a
> small ball bearing must make a perfect seal, they all look perfect. ?They
> said everything looks absolutely pristine. ?No scoring down passageways
> that might not allow maximum PSI, etc. ?They also showed me the linin
>  g on a?Sun gear they had on the beach, and said mine looked good and the
> rivets looked original.?They 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
> hours doing internet research on the problem. ?As they described everything
> and what they've checked, which seems like everything, I said I'd send out
> this email to the list. ?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?lead to the solution.
>
> Thanks,
>
> Rye Livingston
> Triumph Travelers Sports Car Club
> Activities Chairman
> 1960 TR3A
> PH: 530-FIND-RYE
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