Tried locating it in the crankcase but could not find it
There's a relatively easy test. Use a rubber glove and hold it over teh oil filler while the engine is idling. If it inflates the glove, you need to replace the PCV kit.
Also, do the same over the dip stick tube. If it inflates...
It should gently suck the glove in, showing slight vacuum.
As for replacing it - wheee! That's a fun one. You basically remove the fan, the air tube (if it's a turbo) and then the intake manifold. Then you replace the oil separator, use a zip tie to poke around the drain from the oil separator to ensure that's open. The banjo bolts are the hard parts to get to, but otherwise it's more tedious than difficult.
There's a kit from FCP that is about $350 or so, and contains all the parts. I ended up using regular screw-type clamps instead of the Oetiker 'squeeze' clamps Volvo used on the hose connections.
SOURCE: pcv valve location
volvo s80 y reg 2.4 runs ok little bit lumpy tickoover when warm but very loud whistling noise take dipstick it stops but very big suction from tube not pressure it is not breather box under manifold
SOURCE: How to replace a front crankcase seal on a 1993 Volvo 960
seal will be on crankshaft pulley
when you remove pulley will be in timing case knock out and refit new one making sure same as old one and refitted the same way
Turn the Volvo 850 off and allow the engine and its components to cool for 30 minutes.
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.
Disconnect the hose from the valve by pulling the hose out of the valve. The hose will come off the valve with minimal force.
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.
Turn off the engine of the Volvo 850. Use needle-nose pliers and grip the valve. Pull the valve off of the crankcase.
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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