Pcv Question


misa

Recommended Posts

Hi guys!

I'm planning to replace pcv system on my '97 850 2.5 20v soon.I just wait to do that on my next oil change,because it's highly recommended to change oil when servicing pcv.I read a lot about replacing pcv,but unfortunately not so much about cleaning it.What is a difference?

So my question is:

-is there some valves or filters inside that is hard to clean or what?

-can it be cleaned or it needs to be replaced?

Thanks!

Link to comment
Share on other sites

Thanks lee,i know.This topic was active for a while at matthew's,but in a past few days i read here at volvospeed something about cleaning pcv and that is the reason that i activated this topic again.

Thanks again!

Link to comment
Share on other sites

You can try to clean it. I buy old beater cars that have not, with the exception of the '94 N/A, been well cared for. In all of my cases the PCV lines were very brittle and broken or very brittle and they broke when I removed them. I have not had the broken nipples on the top of the oil trap that I have seen pictured here and elsewhere but I change it anyway since it is cheap and it is the heart of the system.

I understand thrift but given the labor involved this is not a place that I cheap out on parts.

Best of luck to you whatever you decide to do.

...Lee

Link to comment
Share on other sites

You can try to clean it. I buy old beater cars that have not, with the exception of the '94 N/A, been well cared for. In all of my cases the PCV lines were very brittle and broken or very brittle and they broke when I removed them. I have not had the broken nipples on the top of the oil trap that I have seen pictured here and elsewhere but I change it anyway since it is cheap and it is the heart of the system.

I understand thrift but given the labor involved this is not a place that I cheap out on parts.

Best of luck to you whatever you decide to do.

...Lee

agreed you're just better off replacing the whole thing. look at the lines wrong and they break if they're original

Link to comment
Share on other sites

We just did that on 1997 850R, and ended up replacing lines, flame trap, and some hoses. Don't forget the intake manifold gasket.

If you buy the kit from FCP it will come with a new gasket, I think DW's kit comes with one aswell.

Link to comment
Share on other sites

Don't forget to check the lower passage for blockages. This would be the connection @ the block where the small silver hose goes. You need to blow through with a hose to make sure the oil pan isn't blocked, if it is you will still have crankcase pressure. You should hear the oil bubbling in the pan, if not it's clogged in the pan. I see lots of threads on here about PCV replacement, and nobody every mentions this portion of the job. Most aren't blocked, but I have seen engines that aren't slugged that have a little buildup in the pan and are blocked.

Link to comment
Share on other sites

Don't forget to check the lower passage for blockages. This would be the connection @ the block where the small silver hose goes. You need to blow through with a hose to make sure the oil pan isn't blocked, if it is you will still have crankcase pressure. You should hear the oil bubbling in the pan, if not it's clogged in the pan. I see lots of threads on here about PCV replacement, and nobody every mentions this portion of the job. Most aren't blocked, but I have seen engines that aren't slugged that have a little buildup in the pan and are blocked.

Wait a minute...i know about passages from block,but what silver hose?All hoses i have are black!

Link to comment
Share on other sites

Archived

This topic is now archived and is closed to further replies.