I ran into this problem on 2 of the 3 transmissions with A-type overdrives
I rebuilt in late November / early December.
What happens is the caged needle bearing on the smaller end of the laygear
walks out of place and grinds its way into the small thrust washer that
makes it almost impossible to remove.
It seems that the small circlip if used also fails allowing the bearing to
move into the thrust washer.
In both instances we had to replace the case since the damage was so bad it
destroyed the flat surface of the case.
Since 4 speeds with out O/D are readily available we stripped down 2 to use
their cases.
The last one I built was so bad and the washer would not come out. I had to
wrap a chain around the cluster gear (layshaft) and use a heavy "Slugger"
Body Dent Puller to get the laygear out.
I replaced that laygear as well.
I found this to be on the O/D transmissions but have not seen it on 4 speed
only transmissions.
FYI
Glenn TR6, TR250, MGTC, BMW 2002 Roundie, Mazda Miata
On Tue, Jan 9, 2018 at 6:40 AM, fubog1 via Fot <fot at autox.team.net> wrote:
> What Steve said, this is the way to do it.
> Also I recently noticed that Moss is selling a double bearing gear now.
> Glen
>
>
> -----Original Message-----
> From: Steve Yott <tr4 at wi.rr.com>
> To: van.mulders.marcel <van.mulders.marcel at telenet.be>; 'fubog1' <
> fubog1 at aol.com>
> Sent: Mon, Jan 8, 2018 7:01 pm
> Subject: RE: [Fot] TR6 transmission rebuild - counter shaft gears
>
> For all gearboxes I rebuild and for a number of other builders I modify
> the lay gear by boring the 1st gear end in order to fit a double bearing
> which pretty much eliminates bearing and shaft failure. There is too much
> load on the bearing and shaft in this area and the double bearing
> installation mimics the more durable Stag gearbox. At the same time I
> machine a groove in the end to fit a circlip to prevent bearing walk. I
> also use Loctite retaining compound to add a little further fixing for the
> bearings.
>
> Steve Yott
> Silver Lake Triumph Centre
>
> *From:* Fot [mailto:fot-bounces at autox.team.net] *On Behalf Of
> *van.mulders.marcel---
> via Fot
> *Sent:* Monday, January 08, 2018 12:20 PM
> *To:* fubog1 <fubog1 at aol.com>
> *Cc:* fot <fot at autox.team.net>
> *Subject:* Re: [Fot] TR6 transmission rebuild - counter shaft gears
>
> These shell needle bearings are easily damaged : when the shell is warped
> a bit, it will fail. When the bearing is in place, one should check if the
> needles can be spinned freely.
> A nylaton bush of the TR4a -TR6 inner wishbone bearing is great for
> pushing these shell bearings in place. These bearings are not secured by a
> circlip, contrary to the open cage needle bearings.
> But the needles of the open cage bearings are running directly against the
> ev. worn or damaged inner surface of the laygear.
> Marcel
>
> ------------------------------
> *Van: *"fot" <fot at autox.team.net>
> *Aan: *gblake58tr3 at icloud.com, "fot" <fot at autox.team.net>
> *Verzonden: *Maandag 8 januari 2018 15:33:33
> *Onderwerp: *Re: [Fot] TR6 transmission rebuild - counter shaft gears
>
> It probably has the later type shell bearings and 1 or both have worked
> loose in the laygear housing bore and "milled" into the thrust washer (s).
> Glen
>
>
>
>
> -----Original Message-----
> From: Greg Blake via Fot <fot at autox.team.net>
> To: Fot <fot at autox.team.net>
> Sent: Sun, Jan 7, 2018 8:56 pm
> Subject: [Fot] TR6 transmission rebuild - counter shaft gears
>
> I am rebuilding a TR6 transmission and ran into a strange snag. When I
> removed the countershaft the counter shaft gears did not drop to the bottom
> of the case. I had to tap on the counter shaft gear set with a brass punch
> to get them to move far enough to allow the input shaft and gear to be
> removed. Now that I have the main shaft out of the case, I can't get the
> counter shaft gears out of the case. I've been able to move them a little
> bit by tapping on the gears with a brass punch through the drain hole but I
> can't get them out. Has anyone run into this before? Any ideas to get them
> out?
>
> Thanks.
>
> Greg
>
> Sent from my iPhone
> _______________________________________________
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> _______________________________________________
> fot at autox.team.net
>
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> marcel at telenet.be
>
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