I had the brass bushing in a clutch bobbin seize up on the input shaft. Weird. Did so after just one weekend. The good news, after removing tranny I was able to easily pull the bobbin off the input shaft with help of a bearing puller and was also able to clean up the input shaft. Just a bit of brass deposited on the input shaft which cleaned up nicely. Also able to press the brass bushing out of the steel bobbin.
Input shaft before cleaning it up.
Bobbin and bushing and you can see the gaulding (sp?) in about the first 3/4" of the bushing. (In case you're wondering it's an installation using a Lotus ~3" adapter instead of the usual ~2" adapter. Thus a 1" longer input shaft and longer bobbin required. Also, it's a Tilton clutch.)
Anyway, it was a brand new input shaft and a bobbin that I had from somewhere. Maybe I'd honed the brass bushing in the bobbin for a "nice" fit over the input shaft that didn't have enough clearance and it tried to seize up after being used a bit.
Does anyone know what would be a proper clearance (i.d. of brass bushing vs. o.d. of input shaft)? Scotty, you out there? I can re-press the brass bushing into the bobbin and then re-hone the bushing i.d. to get more clearance. In the past I've seen bobbins where the brass bushing was pretty beat to hell and they still worked OK. So too much doesn't seem to be a huge issue. But to little clearance?????
Any suggested a proper clearance to shoot for.?