2007 S60 2.5T To Banjo With Or To Banjo Without Check Valve Topic is solved

Post by **MoVolvos** » Yesterday, 14:19

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Can the banjo bolt without the check value be used for the PCV system? Reviews seem to indicate the check valve is unnecessary.

Volvo PCV Banjo Bolt - Genuine Volvo 8653884
https://www.fcpeuro.com/products/volvo- ... 70-8653884
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Post by **chrism** » Yesterday, 15:06

I’m thinking the check valve acts to protect the PCV system in the event of a bad engine backfire.

Post by **MoVolvos** » Yesterday, 15:51

chrism wrote: ↑Yesterday, 15:06 I’m thinking the check valve acts to protect the PCV system in the event of a bad engine backfire.

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Not sure how that works to protect it. Can't remember when I had an engine backfire so don't think that is the main reason for the check valve.
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pobracara · Post by **pobracara** » Yesterday, 16:13

The check valve prevents pressure from escaping from the intake manifold to the crankcase when you are in boost mode

Post by **chrism** » Yesterday, 16:35

pobracara wrote: ↑Yesterday, 16:13 The check valve prevents pressure from escaping from the intake manifold to the crankcase when you are in boost mode

Ah-ha. That would make sense. Thanks.
So naturally aspirated engines don’t have it?