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<div> <font size="3">It has been many years (< 25, I think) but I once rebuilt a TR6 transmission with a used mainshaft that had similar wear on a shoulder like that. There was a thrust washer that fitted up against shoulder. A few years later I was rebuilding it again. The thrust washer had broken into parts. My solution was to buy a new mainshaft (that is a story in itself) along with some other parts. 25 years later that part is still soldering on. (I had to rebuild again for layshaft issues but that's unrelated)</font></div>
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<div><font size="3">I would be very reluctant to reuse that mainshaft. The raised ridge is not what worries me it is the fact that the edge of the grove is not square and the thrust applied by the helical gears will point load the split collars and they will fail again. The TR6 transmission si probably different but the basic design is similar and the force loading is also similar. Helical gears are sued to keep tooth noise down but the fact that they are wound in a helical manner around the axis means the forces applied to the gears is at an angle to that axis. Part of that force is used to rotate the shaft but the other is applied to the bearings at either end of the transmission meaning the split collars in your case will take up that force as an interface between the shaft and the bearing inner race. I don't have enough experience to say whether the transmission will last a week, month, year or 10 years with that shaft but I would have much more confidence in a new, quality shaft.<br>
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<div><font size="4">Dave <br>
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<div style="font-family:arial,helvetica;font-size:10pt;color:black"><font size="2">-----Original Message-----<br>
From: aribert neumann <aribertn@gmail.com><br>
To: triumphs@autox.team.net<br>
Sent: Sun, Mar 19, 2023 6:46 pm<br>
Subject: [TR] Calling anyone with transmission rebuilding experience - second attempt, part 1<br>
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<div class="yiv0386429821gmail_attr">I tried to send this message yesterday but it has not appeared yet so I am resending it - guessing that I may have had too many (or too large of) images. I'll splint it into two messages and reduce the image file sizes - hopefully this message will go thru.</div>
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<div dir="ltr">I'll start off with a quick comment - as I started to type the e-mail address, up popped suggestions that started with TR. Third on the list was "TR3driver" - the late Randall (Young, I think). I sincerely hope someone will "fill his shoes" with respect to my questions. I'm not on any other Triumph related groups - you are all I've got for input.
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<div>I am in the process of reassembling (or trying to) my GT6 transmission - please don't tune out, conceptually the trans is similar to the big Triumphs. On dismantling my trans, I observed that the split collars had spun on the main shaft, wearing a relief in the collars and raising an edge on the main shaft. What keeps the collars from rotating when 1st gear is in motion? I am focused on preventing this problem in the future. When I rotate first gear on the shaft, the split washers rotate with the shaft. I am wondering if the tolerance stack up of the 2nd & 3rd gear bushings, spacers, etc (from the circlip to the split collars) was too large allowing first gear to push the split collars forward on the shaft. What else could cause this rotation/wear? </div>
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<div>Images as follows - old mainshaft with raised edge from the spinning split washers, good & worn split washers, good split washers nested in the first gear pocket. Off in digest mode preparing part 2 of this message.</div>
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