Question about 1994 Volvo 850

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850 crankacse breather getting clogged with emulsion. I have a Volvo 2.4 20 valve 850 engine in my 1998 Renault Safrane. Yes, believe what you read. It dates from a period when the two companies were collaboarating and swapping stuff like engines. The Renault garage aren't over-familiar with the engine but there is no Volvo garage on our island. A couple of times the crankcase breather has become clogged with emulsion on long journeys and caused most of the engine oil to be chucked out. I would like to be able to check it periodically my self. Can anybody pass any diagrams, or whatever, to enable me to locate the crankcase breather and know what to do?

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  • lombardo Sep 10, 2008

    My 94 850 is pushing oik up through the filler cap. The cap has been replaced to overcome the problem but did not work. I need a solution. Can anyone help please?



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You are going to have to remove the intake filter, figure out which one of 13 oil traps you have, and replace it with a new one, as well as the associated hoses for the PCV system. Make sure you have an intake gasket before you go back together.

Posted on Oct 31, 2008


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  • 1

    Turn the Volvo 850 off and allow the engine and its components to cool for 30 minutes.

  • 2

    Open the hood of the Volvo 850 by pressing the hood release button within the vehicle. Locate the PCV valve; the valve is identified as a small rubber valve located on the engine crankcase. You will also notice a small hose sticking out of the end of the valve. If needed, read the Volvo 850 owner's manual for more information.

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  • 4

    Turn on the engine of the Volvo 850. Place your finger over the hole in the valve where the hose was connected. If you feel a strong suction, the valve is working properly and fine. If you do not feel a strong suction, the valve may be clogged and needs replacing.

  • 5

    Turn off the engine of the Volvo 850. Use needle-nose pliers and grip the valve. Pull the valve off of the crankcase.

  • 6

    Install a new valve by putting the valve in place on the crankcase. Insert the hose into the new PCV valve. Secure the new valve in place by pushing it down until it locks into place. Close the hood of the Volvo; pull up on the hood to ensure the hood is shut properly.

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