25-02-2022, 02:30 PM
I wonder what any objection to fitting tapered roller bearings to A7 front hubs might be.......apart from finding any with cup and cone the right diameter and width to fit in hub, around stub and between hub and felt carrier with washer.
The tapered roller bearings fitted to some cars have a spacer between inner and outer bearing so locking nut and 2 bearings against the shoulder of the stub.
The axial clearance, usually around 0.002 to 0.007 inch is achieved by shims between spacer and inner cone (outer race of a bearing = cup and inner = cone)...the thicker the shimming the more the cups of inner and outer bearings move apart and being tapered roller bearings the smaller the end play.
No fiddling with a split pin.
Nice and easy to set up with sets of correct ID shim washers and hub nut can be done up tight. With tapered roller bearings on one of my cars, for MOT I take along my DTI if I know MOT man is not knowledgable to demonstrate the end float of the wheel being as specified in the manufacturer's workshop manual (or bearing manufacturer's end float requirement for the pair of tapered roller bearings).
I would think that if the edge of the A7 inner hub (officially called the felt carrier in the Austin spares catalogue) had 1/16 inch back and forward (i.e. radiall) play then since that is 0.0625 inches, then 62 thou play in the bearing axially is surely far too much? Put simply that means that with the balls against the cone (inner race) there is a gap of 62 thou between the balls and the cup (outer race)? (assuming the cup is a good push fit in the felt carrier and the cone is a good push fit on the stub and all the play is in the bearing.
Dennis
The tapered roller bearings fitted to some cars have a spacer between inner and outer bearing so locking nut and 2 bearings against the shoulder of the stub.
The axial clearance, usually around 0.002 to 0.007 inch is achieved by shims between spacer and inner cone (outer race of a bearing = cup and inner = cone)...the thicker the shimming the more the cups of inner and outer bearings move apart and being tapered roller bearings the smaller the end play.
No fiddling with a split pin.
Nice and easy to set up with sets of correct ID shim washers and hub nut can be done up tight. With tapered roller bearings on one of my cars, for MOT I take along my DTI if I know MOT man is not knowledgable to demonstrate the end float of the wheel being as specified in the manufacturer's workshop manual (or bearing manufacturer's end float requirement for the pair of tapered roller bearings).
I would think that if the edge of the A7 inner hub (officially called the felt carrier in the Austin spares catalogue) had 1/16 inch back and forward (i.e. radiall) play then since that is 0.0625 inches, then 62 thou play in the bearing axially is surely far too much? Put simply that means that with the balls against the cone (inner race) there is a gap of 62 thou between the balls and the cup (outer race)? (assuming the cup is a good push fit in the felt carrier and the cone is a good push fit on the stub and all the play is in the bearing.
Dennis