Rear Wheel Bearing Difference, Comparison that may have caused my failures |
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Rear Wheel Bearing Difference, Comparison that may have caused my failures |
914Sixer |
Jan 15 2017, 03:50 PM
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#1
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914 Guru Group: Members Posts: 8,882 Joined: 17-January 05 From: San Angelo Texas Member No.: 3,457 Region Association: Southwest Region |
For months now I have maintained there is a big difference in the quality of the new rear bearings verses the original ones. Today I had time to compare an original FAG (Germany)and a new SKF (Italy) bearing shells. MY conclusion is what I suspected, the new ones are NOT the same. I took pictures and measurements to document what I saw. I hope the pictures let you see the difference. Guess which one is the original German one!
Attached image(s) |
jd74914 |
Jan 17 2017, 12:57 PM
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#2
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Its alive Group: Members Posts: 4,780 Joined: 16-February 04 From: CT Member No.: 1,659 Region Association: North East States |
Interesting. It looks like they are trying to save some material cost in the races.
Do they have the same number of balls? If they do I would expect the newer ones to be stronger given larger balls. What's the failure mechanism? I assume people notice slop, but are the balls or races failing? Perhaps there is some surface hardness issue? Or a preload mismatch? Do Boxsters have the same loading a 914's? I feel like grease shouldn't be an issue since they are pre-greased and the fact that the bearing world should have a pretty good handle on greases... |
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