dklawson
Yoda
Offline
Later this fall I will rebuild the gearbox in my Mini. There are a few parts shared between the early Mini and Spridget gearboxes. I'm looking for information, observations, and measurements for "The Pill", BMC part number 22G89.
This is a hardened pin, radiused on both ends. It is 3/16" in diameter but I don't know the exact length (it is approximately 9/16" long). It is used on the 1st/2nd selector hub on 3-synchro gearboxes. It is supposed to somehow control/prevent overthrowing the shift which in turn prevents the selector hub from spewing out its detent balls and springs.
My questions are:
1) Does anyone have one of these 22G89 pins that they can measure with calipers? My practice/parts gearbox is missing this and a couple of other parts. I can make a practice pin out of an alloy dowel but I need the end-to-end length measurement.
2) Can anyone explain how this pin is supposed to work? I can see that it goes into a full radius groove on the gearbox mainshaft and that sliding motion of the synchro hub SHOULD allow the pin to lock the inner part of the hub to the mainshaft. I just don't understand what's supposed to happen and still have the outer ring of the hub able to move to engage gears.
Any observations and measurements will be greatly appreciated.
This is a hardened pin, radiused on both ends. It is 3/16" in diameter but I don't know the exact length (it is approximately 9/16" long). It is used on the 1st/2nd selector hub on 3-synchro gearboxes. It is supposed to somehow control/prevent overthrowing the shift which in turn prevents the selector hub from spewing out its detent balls and springs.
My questions are:
1) Does anyone have one of these 22G89 pins that they can measure with calipers? My practice/parts gearbox is missing this and a couple of other parts. I can make a practice pin out of an alloy dowel but I need the end-to-end length measurement.
2) Can anyone explain how this pin is supposed to work? I can see that it goes into a full radius groove on the gearbox mainshaft and that sliding motion of the synchro hub SHOULD allow the pin to lock the inner part of the hub to the mainshaft. I just don't understand what's supposed to happen and still have the outer ring of the hub able to move to engage gears.
Any observations and measurements will be greatly appreciated.