17-02-2019, 09:32 PM
(This post was last modified: 17-02-2019, 09:34 PM by Bob Culver.)
If assembled as described, and assuming correct crankcase, bearings would have been preloaded, the rear one backwards and thus near collapse! Presumably the front cover plate was not over tight! Examine races carefully for damage. Balls and tracks should all be very smooth. The lower edges of the tracks of one bearing may not look too good, but not normally in contact.
NSK: For unselected ac ball races the axial clearance of a twin assembly unmounted ac bearing of Normal tolerance is given as 20 to 40 microns (.0008-.0016). This is same as Normal rollers but more than for ball races. Definitely no preload.
I dunno what the supplied Seven a.c bearings in the past or now provide but unless especially ordered would expect similar.
Incidentally, to avoid confusion, the NSK catalogue refers to the inner and outer assemblies as rings.
NSK: For unselected ac ball races the axial clearance of a twin assembly unmounted ac bearing of Normal tolerance is given as 20 to 40 microns (.0008-.0016). This is same as Normal rollers but more than for ball races. Definitely no preload.
I dunno what the supplied Seven a.c bearings in the past or now provide but unless especially ordered would expect similar.
Incidentally, to avoid confusion, the NSK catalogue refers to the inner and outer assemblies as rings.