Rear Wheel Bearing / Early 911 Rear Hub Failure, Anyone heard of this happening????? |
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Rear Wheel Bearing / Early 911 Rear Hub Failure, Anyone heard of this happening????? |
John |
Oct 7 2006, 08:46 PM
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#1
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member? what's a member? Group: Members Posts: 3,393 Joined: 30-January 04 From: Evansville, IN (SIRPCA) Member No.: 1,615 Region Association: None |
We were prepairing the track car for the last event of the season for us (in a couple weeks) and noticed one of the rear wheel bearings had given up the fight.
The wheel was very wobbly (could move it about 1/4" in most directions). We had not noticed this while driving at the last event, but we did notice that one or more of the brakes was dragging causing the brakes to fade after several hard laps. I had thought it was one of the front 930 calipers hanging up, but after finding this, I am almost certain that this was the problem. I removed the trailing arm and proceeded to remove the hub to find that the rear hub surface that holds the inner race was badly scored and pitted to the point that it is too far undersize to work with a new bearing. You can visually see where both inner bearing races eroded the outer hub. The inner surfaces of the inner bearing races show no signs of erosion, pitting, or scoring. This is not the condition that the hub was in when I assembled it. Has anyone heard of this happening? On another note, the bearing was a real pain in the ass to remove from the trailing arm (even with my 30 ton press) and I have never had that problem before even with nasty rusty trailing arms. Luckily, I have parts on hand to repair the car. I will try to post pics of the hub later tonight after I finish putting the car back together. I am assuming that somehow the inner races may have spun on the outer hub causing the erosion, but I have never witnessed this before. Anyone have some early 911 outer hubs they want to get rid of????? |
Eric_Shea |
Oct 8 2006, 10:33 AM
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#2
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PMB Performance Group: Admin Posts: 19,278 Joined: 3-September 03 From: Salt Lake City, UT Member No.: 1,110 Region Association: Rocky Mountains |
I have a 914 hub that one of our fine patrons sent me as a core (IMG:style_emoticons/default/dry.gif)
I use it as a paperweight. It had the same issue. I've also had a control arm that was extremely difficult with the bearing... This sounds like a bad bearing/heat situation. They often don't show themselves because they are so tight until they fail. Other than that, I can't think beyond what Paul has mentioned with the 210ftlbs. on the nut. Is the mating flange on the 911 hub in good condition? I have a pair of early 911 hubs if you need them. Eric P.S. Maybe the 3.6 spun the axle/hub assembly faster than the bearing could keep up (IMG:style_emoticons/default/wink.gif) |
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