Odd noise

[Tony Press]

Hi Folks,
I used to run the Type 65 with a twin track self aligning ball race at the rear, with no issues, the crank is a 1 1/2" Allan which is very stiff. I used the front bearings for location as standard.
( I think its still in the garden shed, no sign of brinelling when removed )
I also have a very clever shell bearing conversion for the front and rear mains in the spares pile, I have not yet done a trial assembly on this as it would require some cunning in the oil feed dept.

This would be an SKF RM 10 - with a much lower dynamic capacity than the equivalent roller bearing, lower than the ball bearing and not good at all for thrust loads - the outer ring would have to be a sliding fit in the housing. 

What was the reason for using a self aligning rear bearing with a stiff crankshaft and with the rigid front double bearing assembly (or did you mount these face to face?).

With the self aligning bearing the failure would be fatigue (flaking) on the track or balls rather than brinelling.   

Cheers, Tony.