|
If the "oil breather box" is one and the same with the positive crankcase ventilation (PCV) system, the answer is simple.
It doesn't need to be replaced. The only thing it needs is a regular cleanup.
If you want to replace it, you can buy a new one from Volvo, IDP or FCP Groton.
Still it's not necessary since it's just a metallic filter that can be easily cleaned. You can follow the instructions in the Haynes manual, but as I recently discovered the chemical cleaning with acetone is a process that can take days if it wasn't done regularly.
So based on my experience the quickest way to clean a totally clogged filter is to burn it with a gas torch. It won't melt (you keep it for one to two minutes at once under the flame, then let the oil burn by itself, and so on until completely clean), and you will have a clean filter in less than 30 minutes. The only thing you need to be careful about is the way you hold it, it tends to get very hot and if you use pliers be careful not to sqeeze to deform it.
You should also clean the plastic casing, best with a dry cloth (WARNING: NOT with acetone!!! - I never tried, I don't know if it melts).
And third of all, ALWAYS check the hose that goes to the intake manifold, especially the metallic piece that connects the hose to the manifold. That one can be clogged too, so you can have the surprise to find a relatively clean filter (that is to be read that it still had a small opening in the center, and blowing thru the tube was still possible) and a completely clogged hose to the intake manifold (This happened to my 1979 Volvo 244).
And by the way, from my experience oil blowing thru the front and rear seals is something that appears very late after PCV is completely clogged, if the seals are OK. The first signs of PCV failure are leaks and oil blowing at the oil cap, which are much more easy to be seen since it spreads oil all over the valve cover. (after experiencing this in both my 1991 Volvo 245 and my 1979 Volvo 244) - :-))
Good Luck
|
