I am replacing a rear wheel bearing. Need advice. O'Reilly: gives me a MPB A-9 and the center race slides out. If it is a correct replacement, which part of the inner race goes toward the seal; The thick or thin edge? NAPA: Gives me a PBR9 which is .004 smaller dia. in the inner race and will not slide onto the axle within an inch or so of the machined area. The inner race is thick on both sides and not removable. I'm thinking of using the O'Rielly Chinese version due to the inner dia is bigger, But the style of the inner race is so strange. Hope the 2146 seal is thich enough (vs the 712146 mentioned on other posts) My rear has a round cover, squarish lugs under the cover, 3 hole axle flange and I was given a MPS 2146 seal. I have read a bunch about the variations and problems of the 71-72 rears. No help from the parts counter guys.
Just bought a set locally for mine. Turns out I was getting more road noise with the wider tires on some very rough local asphalt. Yes, the asphalt is on the highway. Found a stretch of new roads & the car is quiet as a mouse. Had my buddy with me & asked him to diagnose it. Now I have a spare set for future needs. Carquest # 2146 seal. (National). Carquest # SET 9 bearing/retainer.(Timken) I can send you the sheet from the bearings or a cut from the parts manual. Send me your e-mail.
I just installed the O'Riley bearing and the collar behind it. The bearing is totally jamed and will not turn.
Oh man, Just saw this...NOT good. Jim Either you have it on backwards (should have been instructions in the box) OR the retaining collar is too large a diameter and pressing on a part of the bearing it should not be. Jim Pictures? Jim
MONZAZ, thanks for looking at this. There were NO INSTRUCTIONS with either part #. This A-9 from O'Reillys was such a mystery. The inner race had a shouler on only one side and was removable. With the race installed from either side the bearings were longer than the race! (yes, shorter than the roller bearings) This left the bearings EXPOSED, UNPROTECTED AND UNRESTRAINED to jam against the larger diameter of the seal step or, when turned around, jam the base of the retaing collar. My friend, who has far more rear differential experience than I, agreed with me that there was no combination to form comfortable solution. Even if we installed the retainer and left some gap, the bearing would easily move off the inner race and allow the bearings to collide with the axle, or retainer, with the inner race fliped either way. He got impatient with me and said "just put the NAPA bearings in" so we pressed the a-9 off and drove the NAPA on. With no instructions, I placed the curved ID of the inner race toward the brake drum, and the flat side toward the retainer....hope it was correct. Thanks guys.
pictures...Need pictures... Is the NApa a tapered bearing? IF so the cone faces inward and the race it rides on will go into the housing FIRST. Jim
The NAPA bearing had an inner race that inclosed the bearings from both sides (not removable). One side had a little roundness comming off the axle surface. That is the side I butted toward the end of the axle, against the larger diameter for the seal. I wish I could post pictures, but failed after many attempts.
Pictures could be helpfull for many members ! Fitting these bearings is still a strange science !:Smarty:
Pictured above is the oddball O'Reiley bearing that had the removable inner race. The race was shorter than the roller bearings and did not protect them from rubbing the collar or the big end of the axle. One too many strokes of the hammer and the collar jammed this bearing. Weird! The inner race is now missing and not in the picture. The NAPA bearing had an inner race with shoulders on both sides and allowed a snug fit and free rolling bearings. That is what I am running now.
What the HELL is that? That IS NOT A A( bearing...They sold you the wrong part....If that was in the box someone put the WRONG bearing in that box. That is a c-clip bearing... That bearing presses into the housing end NOT the on the axle shaft. I can not stand freakin parts stores these days!!! The bearing you need will have a inner race and outer race. SO did the NAPA bearing work? JIm
Yes, Napa gave a bearing with a full width inner race. It worked. I am glad you explained what that stupid bearing was for. It all makes sense now. Thank you MONZAZ for explaining this.
DID you have the INNER race? There were some that did have the inner race that would go inside of the bearing??/ BUT it is not pictured so either it was lost or that is just the wrong bearing with the retaining collar...??? Jim
Yes it came with an inner race, but I forgot to save it. It had a shoulder on one side and the other side was shorter than the width of the roller bearings by about an 8th of an inch.
