Anyone?

 

Most or many PCV valves are just seated in a rubber grommet. I see nothing unusual with our Subarus.

 

The PCV valve is indeed threaded into this cylindrical housing that inserts into the block on my particular engine. I do understand what you are refering to on other engines, but it is not so on the 03 EJ 25 engine. Thanks for the input though.

 

I just searched the entire Service Manual, and there is no reference to that shouldered insert. I call it that because when I went to look at MY04 NA, I see just what you are talking about. I did then remove my PCV valve, just to see if that insert is loose, on mine it is not. Also I see it has 2 flat sides on it as if it were threaded into the engine block. I didn't try to turn that as I didn't want to cause a problem I didn't have before I started. So I put it all back together again.

If there are no threads on it, I might try to clean the surfaces and try an adhesive to hold it in place. Short of trying to contact a Subaru Engine re builder to ask them how it is held in place, I would just try a high temp adhesive to fasten it. Just don't use RTV, as the fumes are known to poison or ruin the current type of Oxygen sensors most vehicles use. You might try to send a message to CCR Inc in Boulder Colorado. They rebuild ONLY Subaru engines and they might give you an answer.

End of MY $.02.

 

Thanks for the reply, ferret. I know of the flat sides of the cylindrical housing that you refer to. I used them to remove the housing from the PCV valve. Housing is smooth machined and I didn't see how it could thread into the block. When I put the housing with new PCV valve back into the engine I used the PCV Valve head to turn it and make sure it was seated back into the block fully, but did not feel it tighten up.
I will check with the local Subaru shop to see what is what, or there is an independant shop that has a master Suby mechanic working there that may be able to provide insight.

 

How often do you have to change it? I never changed it on my last car. (Oldsmobile 88, 240k miles).

 

I do mine once a year. Its only $3

 

Subaru has no change interval on the 2.5L engine.

 

As above, no change interval, I just like to make sure the little things are taken care of before they become bigger problems. This would be bad if it became gummed up and stuck closed as pressure could build up and possibly blow seals.