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I have inspected my gearbox internals, and they are mostly in great condition.
Apart from new ball bearings and seals (routine), the sleeve gear and mainshaft second gear bushes are a little sloppy on their shafts.
They have very thin walls. Is there a better way to get them out than putting the pinions in a soft jawed vice and using a hacksaw?
Steve
I can reveal a workable me…
I can reveal a workable method to an anxious world. The sleeve gear is trickiest, having two bronze bushes with a gap between them.I made up a length of 6mm MS studding with a couple of locknuts 1" from the end. I added two thick washers ground to fit within the bushes, then three thick washers ground to the OD of the bushes. The smaller ones were only to keep the assembly located on the central axis of the sleeve gear.I then used the assembly to pull the outer (kickstart end) bush inward just about 1mm, just to crack the stiction between this bush and the sleeve, using a bunch of big thick washers and a 6mm nut against the pinion end.Then I slipped a big box spanner over the sleeve, 'bridged' it with the main bar borrowed from a two leg sprocket puller, and then pulled both bushes through together. Took a fair amount of force, not far away from the stud threads failing. It would have been no problem with high tensile steel stud/nuts though.Simples
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Previously steve_marshall…
Previously steve_marshall wrote:
I can reveal a workable method to an anxious world. The sleeve gear is trickiest, having two bronze bushes with a gap between them.I made up a length of 6mm MS studding with a couple of locknuts 1" from the end. I added two thick washers ground to fit within the bushes, then three thick washers ground to the OD of the bushes. The smaller ones were only to keep the assembly located on the central axis of the sleeve gear.I then used the assembly to pull the outer (kickstart end) bush inward just about 1mm, just to crack the stiction between this bush and the sleeve, using a bunch of big thick washers and a 6mm nut against the pinion end.Then I slipped a big box spanner over the sleeve, 'bridged' it with the main bar borrowed from a two leg sprocket puller, and then pulled both bushes through together. Took a fair amount of force, not far away from the stud threads failing. It would have been no problem with high tensile steel stud/nuts though.Simples
My thought is that freezing the gear/bushings first would help here. The bronze would shrink more than the steel, and make them easier to remove. Dry ice or liquid nitrogen would probably work even better.
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