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

[MoVolvos]

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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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[chrism]

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

[MoVolvos]

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]

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

[chrism]

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?

[jonesg]

pine hollow diagnostics on youtube had a volvo where the ball bearing from the banjo went through the engine, they found it on the FOD screen in the cat converter, it chipped an exh valve on its way out , besides a misfire it drove for 50K miles before the valve burned up.