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TECHNICAL MOTOBRICK WRENCHING In Remembrance of Inge K. => The Motobrick Workshop => Topic started by: scbmwrider on March 29, 2016, 12:15:03 PM
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A few years ago I found a broken piece on my drain plug of my gearbox. :yow Bought a used gearbox to replace it. Now that gearbox is jumping out of 2nd so opened up the old one to find where the piece came from.
It's small and can't seem to see anywhere that it came from. Pictures in the link.
https://goo.gl/photos/bmXAvjxRgbD6ZPy58
Could it be #5 in the shift fork section? If so how hard to replace?
HELP please!
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I think that it is the roller(#5 on the fiche) that allows the shift fork to follow the groove in the shift drum. It's hard to say how it fell off the pin it runs on, but I do know that when I was putting my transmission back together after tightening the grub screw one of them fell off and got hidden under a gear. Almost didn't see it, and it took about a half hour to get the damn thing out. I suspect it fell off when someone was putting your transmission together and they didn't notice it.
Things will work, just not nice and smooth without that roller. Eventually, the bad shifting and the part banging around in there will make things stop working. Have you checked the gear teeth for damage?
As far as replacing it, shouldn't be too hard. Just get a good manual and take your time and a lot of photos as you take things apart. You should be able to get the drum out enough to get the roller in without having to pull any of the shafts with the gears. I did the grub screw on mine in one day from start to finish. and that included putting that roller back in after it fell out.
I would suggest making a support of some kind to hold the bottom half while you work on it. It will make things easier for reassembly. Make it before you take anything apart.
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Could it be #5 in the shift fork section? If so how hard to replace?
Yes, and not hard unless you have fat fingers.
One thing to watch for is the shims/spacers on the shafts. They may or may not be the same thickness, hey they're called shims for a reason, so make sure they go back in correctly.
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Yes it is one of the "rollers" that are between the shift fork and drum. Can I just lift the shaft that the shift fork is on to replace the ring?