Motorsports tapered roller bearing

[wd6681]

I'm still trying to understand what the failure (or damage) mode is for your bearings. The photos suggest there may be debris denting, so cleanliness may be an issue.

As far as setting clearance, aim for 0.010 mm, or as close to 0 as possible. Err on the side of clearance, not preload.

The picture is not super clear apologies. These were just wiped with a rag in the cold. The bearings and races both look perfect with no pitting, scoring or even haze. This makes sense as they were not making noise. I believe that the increases play comes from either the grease pack of the bearings themselves dropping (grease running out of hub face (not blowing out rear seal) out due to the extreme temperature. Or the bearings are taking an additional further seat after some use.
My current plan for the next spring race is to the use these bearings replaced with a higher drop point grease (clay or calcium sulfonate, please make your suggestions). Set them up. Run it for a few minutes then re-dial in the bearings.
Thankyou

 

[Kestas]

Before setting clearance, you should crank down really hard while hand turning to seat the races. You won't damage the races doing this. This would preclude any movement or developing clearance during use.

 

[wd6681]

Before setting clearance, you should crank down really hard while hand turning to seat the races. You won't damage the races doing this. This would preclude any movement or developing clearance during use.

Right, unfortunately the way this is designed is with a spacer between the two bearings so you still torque it down to the original cassette style hub spec (approx 90ft lb, don't have in front of me). Think of it as a setup similar to a crush sleeve on a pinion. The purpose of the arbor shims is for the variance in either race depth, machining, etc. Clearly the whole setup was poorly thought out. I do agree though that it is likely that the bearings may have not been completely seating.

This is not a traditional setup with a slotted spindle and castle but where you can seat the bearing then back off to the desired preload.

 

[willbur]

Any specific suggestions? Such as polyrex?

in my opinion polyrex is intended for ball bearings, not roller