Bushing dances again - Page 2 - Alfa Romeo Bulletin Board & Forums
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post #16 of 20 (permalink) Old 05-18-2019, 12:34 AM
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Crackie, if I discovered those gears in a box I was rebuilding, I would be concerned about the striations on the inner walls of the dimpled bronze bushings and the fact that the oil passages on the bushes were no longer aligned with the oil passages on the gears. Clearly a sign that at some point those gears seized up on the shaft, probably due to a lack of adequate lubricant.
I would press those bushes out and replace them, and use Loctite when installing the new ones. Even if you are successful in re-aligning the oil passages of the current bushings (whether by removing and rotating them or just rotating them somehow) or if you leave them where they are and just cut a second set of notches where the gear oil passages are, you will still have those rough scratches or striations on the old bushes that really need to be dressed out, and that minor dressing will certainly increase the ID of the bore.
You have gone this far, you might as well rebuild it right and make sure you won't have to pull the gearbox again in a few years.
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post #17 of 20 (permalink) Old 05-18-2019, 07:51 AM Thread Starter
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It spun and also moved longitudinally in the gear. The surface of the bushing should not extend above or below the thrust surface (as RJ reminded me).

I’d replace it. Or at a minimum, recenter it and expand to get a tight fit. But as Norse pointed out, if you want a great crisp precision box, don’t leave something like this hanging in the rebuild. Better to make the extra effort. You could also ask RJ (alfar7) as he has decades of experience in this work.
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post #18 of 20 (permalink) Old 05-20-2019, 11:26 PM
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So what gives me pause about doing the bushings is the bad stories about not being able to find a machine shop capable of this work. Seems like several folks have had to do this job more than once, with non-trivial expense and time, to get it right. If what I have is still serviceable, I am reluctant to open a pandora's box.

But I am still going to talk to a good machine shop here in Portland to get their take.

To that end, a few questions:
  • Do any suppliers still have the "spiral" bushings that often don't need machining? What I see on Centerline, Classic Alfa, Alfa Service and OKP web sites are the "dimple" ones.
  • I think what I am asking the machine shop if they can do is making sure the bushing is perpendicular and straight with no offset at .003-.005, correct?
  • What are you all using to press out the bushings? I often use sockets to press things out. OK in this application, assuming I have one that fits well?

And a different but related rebuild question:
  • What are folks using to replace the shift rod o-rings? And are you getting zero leaks as a result? It was suggested on another thread that Viton O-ring 14 x 2.5mm is a good bet.

Thanks!

--Scott
Current: 85 GTV6, 69 Duetto, 17 Giulia, 74 GTV
Past: 65 Giulia Sprint GT, 77 Alfetta, 79 Alfetta, 87 Milano Gold, 74 GTV (Euro)
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post #19 of 20 (permalink) Old 05-24-2019, 03:23 PM
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AFRA has/had the spiral bushings,but I wouldn't expect them to fit right out of the box.Mine do not slip fit over the shaft or spacer,so still need machining https://www.afra.it/en/cambio/1396-b...mbio-alfa.html
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post #20 of 20 (permalink) Old 05-25-2019, 10:47 AM
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Thanks alphil.

--Scott
Current: 85 GTV6, 69 Duetto, 17 Giulia, 74 GTV
Past: 65 Giulia Sprint GT, 77 Alfetta, 79 Alfetta, 87 Milano Gold, 74 GTV (Euro)
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