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Originally Posted by chitowndad
So what's the difference between the RMS and IMS? I'm familiar with the RMS (Rear Main Seal) which I believe is on the block behind the cams, correct? What exactly is the IMS and when it fails why do you have to replace the entire engine?
Thanks,
-Steve
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The IMS is the intermediate shaft. Unlike RMS it's not a seal. My very basic understanding is that there is a ball bearing in the intermediate shaft that fails and as it fails it comes apart in tiny pieces of metal that you'll later find in your oil and oil filter. Some, like mine, are detected while the car still runs and theoretically you should be able to tear down the motor, replace the bearing and shaft, rebuild, and go on your merry way, but Porsche does not manufacture the replacement parts necessary. Porsche knows they messed up designing it and does not manufacture the identical bottom end any more. They've since upgraded to a larger bearing, which should be better. I hope this helps, and I'm sure others will chime in.