Britbike forum Forums Thread Like Summary - 3 peice bearing

I slip the ring in before I fit the bearing into the case. The spool goes on the shaft. When you introduce the crank into the bearing it may take some fiddling to avoid trapping the ring but not much.
I can't see how fitting the bearing the other way would work, fitting the spool to the shaft from the outside and entering it into the ring would be difficult. Fitting the bearing assembly to the shaft and then the crank and bearing into the cases might work, but why would you.
I've never seen cases with a bigger aperture to fit the ring from the outside, but it's a good idea.

PS. I'm trying to recall if my Harris Bonnie was fitted with a roller bearing, but I don't think it was. It's the only Harris engine I've opened completely. I do remember that I fitted it with a roller bearing afterwards. Can't remember if the aperture was bigger, it was a long time ago...

PPS. Why don't the Norton guys use these bearings but insists on letting the crankshaft sail between single lip roller bearings?

SR

...the chamfer goes to the outside of the RH case. You will see the name etc on it. Why you all are saying the other way around?

PPS. Why don't the Norton guys use these bearings but insists on letting the crankshaft sail between single lip roller bearings?

SR

I will when there is a problem, currently my MK2a has never had the bottom end apart as there are no issues.

The bearing can be fitted two ways and still be correct, either with the "washer" fitted next to the crank or next to the crankcase. In either, the chamfer goes to the outside of the bearing. Personally, I fit these bearings with the "washer" next to the case/crank pinion side, it allows easier assembly of the cases. Whatever, raygun will be correct wit the chamfer pointing to the pinion.

So the chamfer faces the crankshaft pinion thanks