Rear spndle tool

[Chuck S.]

Re: Just why ??

Larry, the purpose of the press fit is to KEEP the inner race from turning on the spindle.

Unless the inner race has an interference fit on the spindle, it WILL rotate when the grease in the bearing resists the rotation of the spindle. In machinery, you can not have relative movement between straight shaft fits and inner bearing races, coupling hubs, etc ; it creates overheating and failure by meltdown if rotation is unlimited, or fretting which can lead to failure by fatigue cracking (typically starts in a shaft keyway).

The outer races on wheel bearings are driven into the hub or spindle supports whcih creates a light interference fit. On the rears, the wheel bearings with the inner race is pressed onto the spindle. I don't know why this is not a problem on the fronts, where the wheel bearings can be easily slipped on and off the spindle, unless the very slight wheel bearing adjustment pre-load is enough to keep the inner races from turning.

[Larry Clain]

Re: Just why ??

Thanks Chuck that was my only thought about it also. I have done many of them for years and loosened the small bearing race to where it was a less of a interference fit but still was tight just not as tight as they came from the factory. To date they have never gave a problem or have I ever had a come back. They are a horror to get apart the first time. I think they use just too tight a interference fit on them from the factory. I am suprised that they don't split the iner race from being so tight.