Quote:
Originally Posted by SC-986
If this premise is correct then why did the Porsche engineers specify a sealed grease filled bearing and not a bearing with the outer seal removed?
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No clue. The idea of a grease-filled bearing would not be entirely wrong if the shaft wasn`t sealed. Since it`s sealed, the pressure that builds up inside the tube in normal operating temperature forces the grease out of the bearing. When cooling down the opposite happens, vacuum in the tube results in seeping oil into the bearing. Eventually the grease gets replaced by engine oil, that`s what we see when we open a genuine bearing. I think if the IMS was depressurized this wouldn`t happen. Not sure though which is better...
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