PCV - Whats it all about?

sebasteeno · Jul 29th, 2009, 19:20

Having recently bought my first Volvo, a V70 classic 2.5T with 126K, ive heard a lot about this PCV thingie but dont know a thing about it.

So can anyone enlighten me on what it is, when it needs changing/replacing etc?

BlueBrickSte · Jul 29th, 2009, 21:22

Ay up S. I'm sure somebody will correct me if I get this slightly wrong. They usually do. Here goes. PCV; positive crankcase ventilation. afaik as opposed to crankcase ventilation, pcv uses the vacuum on the inlet to basically drag the excess vapours from the crankcase. When your pcv clogs up( flame trap,oil separator, hoses) it creates excess pressure in the crankcase and can cause your crank and camshaft seals to leak as there is nowhere for the vapours to go hth. Ste

ps like the colour and the dark wheels. Smart

the alarming man · Jul 29th, 2009, 21:28

sounds about right..it would seem mine is blocked on my 960....i have just ordered a new flame trap from braydons...and it also seem the 850/960 use the same one ...it cost £1.66...the p and p cost more than the part!!!!!!

Jul 29th, 2009, 19:20	#1
sebasteeno Member Last Online: Jun 26th, 2010 22:49 Join Date: Jul 2009 Location: Hull	PCV - Whats it all about? Having recently bought my first Volvo, a V70 classic 2.5T with 126K, ive heard a lot about this PCV thingie but dont know a thing about it. So can anyone enlighten me on what it is, when it needs changing/replacing etc? __________________

Jul 29th, 2009, 21:22	#2
BlueBrickSte Premier Member Last Online: May 8th, 2016 20:48 Join Date: Mar 2009 Location: near Wigan View Photos By: BlueBrickSte	Ay up S. I'm sure somebody will correct me if I get this slightly wrong. They usually do. Here goes. PCV; positive crankcase ventilation. afaik as opposed to crankcase ventilation, pcv uses the vacuum on the inlet to basically drag the excess vapours from the crankcase. When your pcv clogs up( flame trap,oil separator, hoses) it creates excess pressure in the crankcase and can cause your crank and camshaft seals to leak as there is nowhere for the vapours to go hth. Steps like the colour and the dark wheels. Smart

Jul 29th, 2009, 21:28	#3
the alarming man V.O.C MEMBER Last Online: May 25th, 2015 00:17 Join Date: Dec 2008 Location: medway	sounds about right..it would seem mine is blocked on my 960....i have just ordered a new flame trap from braydons...and it also seem the 850/960 use the same one ...it cost £1.66...the p and p cost more than the part!!!!!!

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