R56 vacuum in crankcase

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12-15-2021, 05:07 PM

DJewell

2nd Gear

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vacuum in crankcase

I have a 2008 mini cooper S. N14 I have vacuum in the crankcase. I am thinking PVC valve. Is there something else I should look at?
Thanks for any help

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12-16-2021, 03:48 AM

njaremka

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You actually want vacuum in the crankcase, as it helps the piston rings seal better. What you DON’T want is boost in the crankcase!

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12-16-2021, 05:22 PM

DJewell

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This is so much vacuum that it's hard to get the oil cap off. Never seen this much vacuum.

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12-17-2021, 03:35 AM

njaremka

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If “that” much vacuum, yeah, I would suspect PCV valve too

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