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944 rear bearing installation


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I have a perplexing rear axle bearing installation problem and thought some 944 pros might know the answer or be able to point me to the right direction.

I recently got my 89 944T sideways in an event and when the contact patches hit a seam in the track pavement a rear bearing was damaged. There was no other damage to the car other than the tire needed to be re-seated onto the rim (it did not knock clear off).

So, while the off ruined an otherwise great day, it was not catastrophic to the car.

To remove/replace the damaged rear axle bearing, I purchased the Sir B90-P02 tool set which seems to work fine

  • Here is my problem:

  1. I have been able to extract the stub & remove the bearing remnant from it.
  2. I also removed the bad bearing from the trailing arm with no issues.
  3. I then installed a new bearing into the arm with the indicated SIR disk #12 (watching & measuring installation alignment closely) and the bearing appeared to install correctly.
  4. I then re-installed the stub with the indicated SIR disk #14 and the stub appeared to install correctly.
  5. Now re-assembled, the stub wobbles 3/8 inches or so, just the same as when the broken bearing was in the trailing arm!
  6. I have confirmed that the bearing saddle (trailing arm) is not damaged or loose.

Thinking I did something wrong, I took it all apart & re-did the job with a second new bearing. This time, before re-inserting the stub, I examined the bearing for play/damage, and sure enough, the second new bearing also had significant side to side play. Thus, it appears that I am doing something very wrong which is damaging the new bearing at the time of its installation to the trailing arm.

I have been careful to follow the Sir Tool instructions, and have also cross-referenced their instructions with other instructions found on-line, but I must be doing something incorrectly.

Might anyone here have any idea/experience with what could be causing the described bearing installation failure? Has anyone heard of or seen this 944 rear axle bearing installation failure?

Many thanks in advance for any information.

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