Tight Front Bearing Install

Lytemup

Member
Hi all,

I'm installing new spindles and bearings on the front of my NAA. The outer bearing has an ID of 0.747" and the shaft OD (just past the castle nut threads) is 0.751". 0.004" seems tight...especially since I don't think there is supposed to be a press fit here at all. Is this how it is supposed to be?

If I heat it up to put it on, it's not like I can pack it first...and then what's the point of the castle nut to set the preload...so I'm thinking something's not right. The inner bearing slides on perfectly.

BTW, many thanks go to you all. I have used the forum for many years but rarely need to post as I can usually find tons of great info in the archives!
 
Lytemup ,The 86576860,/09074,/B1216,/831333M1,/118 should have a ID bore of 0.7500. You say the inside bore of your bearing is 0.747" something is not right with that bearing.
 
You're right. That is not how it's supposed to be. Both bearing inner races should slide on the spindle without being sloppy.
 
ok, unfortunately both bearings came this dimension (exactly)...so I don't have confidence that if I return them I'll get anything different (and will just loose a week or two). I obtained them from this site...

...any suggestions...
 
(quoted from post at 07:50:24 08/18/16) ok, unfortunately both bearings came this dimension (exactly)...so I don't have confidence that if I return them I'll get anything different (and will just loose a week or two). I obtained them from this site...

...any suggestions...
I would call the good folks at YT parts and talk to them about this problem.
 
spoke with YT and they are going to send bearings from another supplier, all their stock from what they sent me measured the same. Great response from them as usual! Thx all for the input!
 
(quoted from post at 11:28:17 08/18/16) spoke with YT and they are going to send bearings from another supplier, all their stock from what they sent me measured the same. Great response from them as usual! Thx all for the input!

Sounds like somebody sold/shipped/packaged the wrong bearings. Wheel bearings would be everyday ordinary "standard" precison bearings and the ANSI/ABMA manufacturing tolerance for inch series tapered roller bearings in that size and class ( Class 4) is .7500/.7505. No bearing manufacturer anywhere is going to miss it by .004 and in the wrong direction.

TOH
 
I had much the same thing happen on front wheel bearings for a Chevy LUV. The inner bearings looked identical to the old ones, but when assembled the hubs just touched the brake backing plate. Only happened on one side and I was able to compare the numbers on the bearings. That way I could tell when the next two sets came in that they were wrong as well. Third set finally included another one that was the right size.
 

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