[Fot] Triumph 4 speed O/D's and Layshaft bearing failures.

[Glenn Franco]

Just to clarify, the problem is on both 4 speed and 4 speed O/D
transmissions.
Every failure I encounter is with the caged needle bearings not the loose
needle bearings in the very early transmissions. The last few years I have
been rebuilding many TR3 and TR4 Transmissions.
The bearing shell (that holds the needles in place) works/walks along the
shaft and forces itself into the small thrust washer that is near the
smaller 1st gear. The shell will then fracture into pieces and the
remaining will dig into the thrust washer and then the case if not removed
soon enough.
The caged bearing shells are available through Moss but the problem is
getting that laygear out of the transmission case. As I stated earlier, to
remove the laygear ( after the shaft is removed ) the small thrust washer
needs to be removed so the laygear can tilt and worked out of the case.
When the bearing shell machines its way into the thrust washer its almost
impossible to get it out. Then you have a scrap case on your hands.
Glenn with 2 n's

On Sun, Aug 11, 2019 at 8:14 AM fubog1 <fubog1 at aol.com> wrote:

> That problem isn't unique to the O/D boxes.
>
> Glen with 1 "n".
>
>
>
> -----Original Message-----
> From: John Styduhar via Fot <fot at autox.team.net>
> To: Glenn Franco <brakey6666 at gmail.com>
> Cc: FOT list <fot at autox.team.net>
> Sent: Sat, Aug 10, 2019 6:41 pm
> Subject: Re: [Fot] Triumph 4 speed O/D's and Layshaft bearing failures.
>
> Glenn, are you saying that the layshaft bearing failure you described is
> more prevalent when the tranny has an O/D or is it a general problem?
> Thanks
>
>
> On Sat, Aug 10, 2019 at 3:52 PM Glenn Franco via Fot <fot at autox.team.net>
> wrote:
>
> Just finished another A Type Overdrive rebuild this afternoon. Next one I
> do I'm going to insist that the owner bring a spare 4 speed for parts or
> maybe 2.
> I very rarely find an overdrive transmission that the layshaft bearing
> next to 1st that hasn't walked and tried to escape the case through the
> thrust bearing. I have tried in vane to remove the laygear with one that
> ground its way into the thrust bearing and sometimes the case. I sometimes
> get the laygear out but in most cases the trans case with the laygear is
> sent to scrap.
> Does anyone have a solution, trick, special tool, to ease the laygear out.
> The normal way is to remove the small thust bearing with a magnet so you
> can tilt the laygear enough to get it out. I have even once resorted to a "
> Slugger Slide Hammer" and chain wrapped around the laygear to get it out.
> Didn't end well however.
> I did read somewhere that someone is using a tapered roller bearing on
> that end which would make more sense than the original design.
> Please advise
> Thanks in advance
> Glenn
> TR6, TR250, Miata, 47 MG TC For Sale, 73 BMW E10 2002 being restored
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