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That looks like the heat treated, hardened=C2=A0 surface is starting to br=
eak up.=C2=A0 That is what happened to my layshaft.=C2=A0 Another reason to=
abandon that mainshaft.=C2=A0 If you have an alternate bearing combination=
that doesn't relay on that surface for the bearing rollers then the harden=
ed surface is no longer critical.=C2=A0 But this is above my pay grade.
BTW, I misinterpreted one of your previous photos.=C2=A0 The split washers =
transfer the lateral forces from the synchro hub to the mainshaft but the e=
nd result is the same, with a compromised groove surface like that the spli=
t collars will fail prematurely.=C2=A0=C2=A0 If you open the grove to clean=
up the shoulder will the split washers stay in place?=C2=A0 If they fall o=
ut you have serious problems.=C2=A0 Even if they stay in place will it incr=
ease backlash?=C2=A0 Can you get oversized split collars?=C2=A0 Make shims?=
=C2=A0 All this is above my pay grade.
=20
Dave=20
=20
=20
-----Original Message-----
From: aribert neumann <aribertn@gmail.com>
To: triumphs@autox.team.net
Sent: Sun, Mar 19, 2023 6:52 pm
Subject: [TR] Calling anyone with transmission rebuilding experience - 2nd =
attempt, part2
Next question - my (new) replacement main shaft is oversize in a couple of =
places.=C2=A0 =C2=A0The diameter under the 2nd & 3rd gear bushings (I have =
opened up the bushings to only have a light interference fit).=C2=A0 Worst =
is the diameter under the rear bearing.=C2=A0 I can install the bearing but=
I have to hammer it ***hard*** to get it to fit on the shaft - can't be go=
od for the bearing - guessing I might change the inner race diameter a mini=
scule amount.=C2=A0 I'm thinking of sending this main shaft back to Spitbit=
s and reusing my old main shaft.=C2=A0 I have cleaned up the groove for the=
split collars on my lathe.=C2=A0 The other damage on the shaft is on the n=
ose where the cage bearing rides in the input shaft - this damage is only o=
n one side of the shaft and only on half of the bearing surface (fore/aft).=
=C2=A0 I am already going to replace the cage bearing with a bearing bronze=
bushing since the surface inside the input shaft pocket is showing wear al=
so.=C2=A0 The max amount of surface missing on the nose of the old main sha=
ft is 0.003 in diameter.=C2=A0 =C2=A0Images:=C2=A0 exploded view from Bentl=
ey=C2=A0 manual, nose of the old, worn mainshaft
Your thoughts and suggestions please - off in digest mode awaiting your res=
ponses.=C2=A0 Trying to formulate a new plan of attack for Monday morning.
** 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">That looks like the heat treated, hardened sur=
face is starting to break up. That is what happened to my layshaft.&n=
bsp; Another reason to abandon that mainshaft. If you have an alterna=
te bearing combination that doesn't relay on that surface for the bearing r=
ollers then the hardened surface is no longer critical. But this is a=
bove my pay grade.<br>
</font></div>
<div><font size=3D"3"><br>
</font></div>
<div><font size=3D"3">BTW, I misinterpreted one of your previous photos.&nb=
sp; The split washers transfer the lateral forces from the synchro hub to t=
he mainshaft but the end result is the same, with a compromised groove surf=
ace like that the split collars will fail prematurely. If you o=
pen the grove to clean up the shoulder will the split washers stay in place=
? If they fall out you have serious problems. Even if they stay=
in place will it increase backlash? Can you get oversized split coll=
ars? Make shims? All this is above my pay grade.<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 6:52 pm<br>
Subject: [TR] Calling anyone with transmission rebuilding experience - 2nd =
attempt, part2<br>
<br>
<div id=3D"yiv7397812571">
<div dir=3D"ltr">
<div class=3D"yiv7397812571gmail_quote">
<div dir=3D"ltr" class=3D"yiv7397812571gmail_attr">Next question - my (new)=
replacement main shaft is oversize in a couple of places. The =
diameter under the 2nd & 3rd gear bushings (I have opened up the bushin=
gs to only have a light interference fit). Worst is the diameter unde=
r the rear bearing. I can install the bearing but I have to hammer it=
***hard*** to get it to fit on the shaft - can't be good for the bearing -=
guessing I might change the inner race diameter a miniscule amount. =
I'm thinking of sending this main shaft back to Spitbits and reusing my old=
main shaft. I have cleaned up the groove for the split collars on my=
lathe. The other damage on the shaft is on the nose where the cage b=
earing rides in the input shaft - this damage is only on one side of the sh=
aft and only on half of the bearing surface (fore/aft). I am already =
going to replace the cage bearing with a bearing bronze bushing since the s=
urface inside the input shaft pocket is showing wear also. The max am=
ount of surface missing on the nose of the old main shaft is 0.003 in diame=
ter. Images: exploded view from Bentley manual, nos=
e of the old, worn mainshaft<br>
</div>
<div dir=3D"ltr">
<div><br>
</div>
<div>Your thoughts and suggestions please - off in digest mode awaiting you=
r responses. Trying to formulate a new plan of attack for Monday morn=
ing.</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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