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It has been many years (< 25, I think) but I once rebuilt a TR6 transmissi=
on with a used mainshaft that had similar wear on a shoulder like that.=C2=
=A0 There was a thrust washer that fitted up against shoulder.=C2=A0 A few =
years later I was rebuilding it again.=C2=A0 The thrust washer had broken i=
nto parts.=C2=A0 My solution was to buy a new mainshaft (that is a story in=
itself) along with some other parts.=C2=A0 25 years later that part is sti=
ll soldering on.=C2=A0 (I had to rebuild again for layshaft issues but that=
's unrelated)
I would be very reluctant to reuse that mainshaft.=C2=A0 The raised ridge i=
s not what worries me it is the fact that the edge of the grove is not squa=
re and the thrust applied by the helical gears will point load the split co=
llars and they will fail again.=C2=A0 The TR6 transmission si probably diff=
erent but the basic design is similar and the force loading is also similar=
.=C2=A0 Helical gears are sued to keep tooth noise down but the fact that t=
hey are wound in a helical manner around the axis means the forces applied =
to the gears is at an angle to that axis.=C2=A0 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 tha=
t force as an interface between the shaft and the bearing inner race.=C2=A0=
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 c=
onfidence in a new, quality shaft.
=20
Dave=20
=20
=20
-----Original Message-----
From: aribert neumann <aribertn@gmail.com>
To: triumphs@autox.team.net
Sent: Sun, Mar 19, 2023 6:46 pm
Subject: [TR] Calling anyone with transmission rebuilding experience - seco=
nd attempt, part 1
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) imag=
es.=C2=A0 =C2=A0I'll splint it into two messages and reduce the image file =
sizes - hopefully this message will go thru.
I'll start off with a quick comment - as I started to type the e-mail addre=
ss, up popped suggestions that started with TR.=C2=A0 =C2=A0Third on the li=
st was "TR3driver" - the late Randall (Young, I think).=C2=A0 =C2=A0I since=
rely hope someone will "fill his shoes" with respect to my questions.=C2=A0=
=C2=A0I'm not on any other Triumph related groups - you are all I've got f=
or input.
I am in the process of reassembling (or trying to) my GT6 transmission - pl=
ease don't tune out, conceptually the trans is similar to the big Triumphs.=
=C2=A0 =C2=A0On dismantling my trans, I observed that the split collars had=
spun on the main shaft, wearing a relief in the collars and raising an edg=
e on the main shaft.=C2=A0 What keeps the collars from rotating when 1st ge=
ar is in motion?=C2=A0 I am focused on preventing this problem in the futur=
e.=C2=A0 When I rotate first gear on the shaft, the split washers rotate wi=
th the shaft.=C2=A0 I am wondering if the tolerance stack up of the 2nd & 3=
rd 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 shaf=
t.=C2=A0 What else could cause this rotation/wear?=C2=A0=C2=A0
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.=C2=A0 =C2=A0 Off in digest mode preparing part 2 of this messa=
ge.
** triumphs@autox.team.net **
Archive: http://www.team.net/pipermail/triumphs=C2=A0 http://www.team.net/a=
rchive
sey@cs.com
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<div style=3D"color:black;font: 12pt Arial, Helvetica, sans-serif;">
<div> <font size=3D"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 agains=
t shoulder. A few years later I was rebuilding it again. The th=
rust washer had broken into parts. My solution was to buy a new mains=
haft (that is a story in itself) along with some other parts. 25 year=
s later that part is still soldering on. (I had to rebuild again for =
layshaft issues but that's unrelated)</font></div>
<div><font size=3D"3"><br>
</font></div>
<div><font size=3D"3">I would be very reluctant to reuse that mainshaft.&nb=
sp; 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 p=
oint load the split collars and they will fail again. The TR6 transmi=
ssion si probably different but the basic design is similar and the force l=
oading is also similar. Helical gears are sued to keep tooth noise do=
wn but the fact that they are wound in a helical manner around the axis mea=
ns 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 b=
earings 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 bea=
ring inner race. I don't have enough experience to say whether the tr=
ansmission 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>
</font></div>
<div> <br>
</div>
<div style=3D"clear:both">
<div style=3D"color:black;font:12pt Arial, Helvetica, sans-serif;">
<div style=3D"color:black;font:12pt Arial, Helvetica, sans-serif;">
<div><font size=3D"4">Dave <br>
</font></div>
<div><span style=3D"font-size:10.0pt;font-family:sans-serif;color:black;"><=
br>
</span></div>
<br>
</div>
</div>
</div>
<div> <br>
</div>
<div> <br>
</div>
<div style=3D"font-family:arial,helvetica;font-size:10pt;color:black"><font=
size=3D"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 - seco=
nd attempt, part 1<br>
<br>
<div id=3D"yiv0386429821">
<div dir=3D"ltr">
<div class=3D"yiv0386429821gmail_quote">
<div class=3D"yiv0386429821gmail_attr">I tried to send this message yesterd=
ay but it has not appeared yet so I am resending it - guessing that I may h=
ave 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>
<br>
<div dir=3D"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. &nbs=
p;Third on the list was "TR3driver" - the late Randall (Young, I think).&nb=
sp; I sincerely hope someone will "fill his shoes" with respect to my=
questions. I'm not on any other Triumph related groups - you a=
re all I've got for input.
<div><br>
</div>
<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 Triu=
mphs. On dismantling my trans, I observed that the split collar=
s had spun on the main shaft, wearing a relief in the collars and raising a=
n edge on the main shaft. What keeps the collars from rotating when 1=
st 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 rota=
te with the shaft. I am wondering if the tolerance stack up of the 2n=
d & 3rd gear bushings, spacers, etc (from the circlip to the split coll=
ars) was too large allowing first gear to push the split collars forward on=
the shaft. What else could cause this rotation/wear? </di=
v>
<div><br>
</div>
<div>Images as follows - old mainshaft with raised edge from the spinning s=
plit washers, good & worn split washers, good split washers nested in t=
he first gear pocket. Off in digest mode preparing part 2 of t=
his message.</div>
<div><br>
</div>
<div><br>
</div>
<div><br>
</div>
</div>
</div>
</div>
</div>
** <a ymailto=3D"mailto:triumphs@autox.team.net"; href=3D"mailto:triumphs@au=
tox.team.net">triumphs@autox.team.net</a> **<br>
<br>
//www.team.net/donate.html</a><br>
Archive: <a href=3D"http://www.team.net/pipermail/triumphs"; target=3D"_blan=
k">http://www.team.net/pipermail/triumphs</a> <a href=3D"http://www.t=
eam.net/archive" target=3D"_blank">http://www.team.net/archive</a><br>
<br>
hs/dave1massey@cs.com" target=3D"_blank">http://autox.team.net/mailman/opti=
ons/triumphs/dave1massey@cs.com</a><br>
</font></div>
</div>
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** triumphs@autox.team.net **
Archive: http://www.team.net/pipermail/triumphs http://www.team.net/archive
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