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Ack! I was going to replace a missing clutch rod bushing in the Mainshaft when I realized WHY it was missing - it fell out or wore away. The bore for the bushing is gone! End of shaft is all wallowed out.
I thought I might drill and place the bushing further back in shaft but the metal at the threaded shaft end (for kickstart gears) is so thin - I don't dare use this shaft.
I have an earlier shaft that is serviceable but the gear is different - see the engaging teeth in photo. Can I press the later gear off and press it onto this early shaft?
[Linked Image from i.postimg.cc]
Bushing falls into end of shaft.

[Linked Image from i.postimg.cc]
Different engagement teeth on gears.

[Linked Image from i.postimg.cc]


Al Eckstadt
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I can't see that it can't be done. The later type of gear was altered to engage gear easier, the 4 speed boxes were slow shifters, as you will know.
I think I'd use the shaft as is though, the difference wasn't great IMHO.

SR

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I think I will give removing the gear from the bad shaft a try. Can't hurt since shaft is junk. If it goes well, then I may install on the older shaft.
Thanks, SR!
I see Tinkerer is OK with it also. Good.


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You should be able to press it off. I have pressed off the gears from T100 shafts with just an arbor press. The hard part is setting it up so as to prevent any damage in either the off or on process.

Gordo


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Hi Al, I’ve never pressed gear off triumph shaft. At work I’ve pressed hundreds of gears off.

I found it best to use long tube with square ends to support gear. Parallels can chip edge of gear if it’s a tight press. If your press cannot fit long tube, use short tube with parallels under tube.

Going back on we had electric deep fat fryer set to 350f. Gears would usually drop on. We had tube & hammer handy for stubborn cases. Done quickly a few taps of hammer seated the gear.

I’d like to know what stops this gear? A shoulder or do you have to measure it?

At all times wear safety glasses as chips can unexpectedly pop off.
Don


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Yes, there's a shoulder to stop the gear. I'll get some tube pieces ready this afternoon. I can cut them 90 degrees on the lathe. I think Craig has a press in his garage - he lives about 3 houses away. No deep fat fryer but I can put it in the kitchen oven (when Tamara's at work!).


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Put the shaft in the freezer and the pinion in hot water from the tap. It'll go on with little or no effort.
I have a simple hot plate in my shop, cheap and very useful. Still, hot water combined with the freezer is usually enough, even for installing flywheels. Hot water is around 70 C and the freezer - 18 C, a difference of say 85 C allowing for variations.

SR

Last edited by Stein Roger; 11/19/22 8:45 pm.
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Done! Pressed off two gears and one back on other shaft. No heat or cold required.. Pressed off smoothly. With the arrival of a new clutch center piece I can now begin assembly of gearbox and primary trans. Then Project 39-1/2 will get its engine mounts, exhaust and various bits re-installed, and - almost the final task - finish the custom wiring harness.
Picture from mock-up stage...
[Linked Image from i.postimg.cc]


Al Eckstadt
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Hi Al, Excellent!! Thanks for the info & follow up. Nice when a plan, goes to plan & works smoothly.

Super cool bike!!
Don


1973 Tiger 750

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