PCV Valve replacement

krh2

Administrator
Article title: PCV Valve replacement

Article description:

Category: Engine/Drivetrain

Date added: Feb 12 2009, 05:46 PM

Article starter: krh2



PCV valve replacement.



The PCV valve connects the crankcase to the intake manifold from a location more-or-less opposite the breather connection. Typical locations include the opposite valve cover that the breather tube connects to on a V engine. A typical location is the valve cover(s), although some engines place the valve in locations far from the valve cover. The valve is simple, but actually performs a complicated control function. An internal restrictor (generally a cone or ball) is held in "normal" (engine off, zero vacuum) position with a light spring, exposing the full size of the PCV opening to the intake manifold. With the engine running, the tapered end of the cone is drawn towards the opening in the PCV valve, restricting the opening proportionate to the level of engine vacuum vs. spring tension. At idle, the intake manifold vacuum is near maximum. It is at this time the least amount of blow by is actually occurring, so the PCV valve provides the largest amount of (but not complete) restriction. As engine load increases, vacuum on the valve decreases proportionally and blow by increases proportionally. Sensing a lower level of vacuum, the spring returns the cone to the "open" position to allow more air flow. At full throttle, there is nearly zero vacuum. At this point the PCV valve is nearly useless, and most combustion gases escape via the "breather tube" where they are then drawn in to the engine's intake manifold anyway.



The 2 PCV valves… $22 at my dealership.







Remove engine cover (10 mm)























Pull up on the rear of the cover to remove..







Done.







Passenger side PCV valve. Notice the oil around it…







Passenger side. Same oil residue…







Intake Manifold…







Pull back the spring clamps…



















Driver side Crank case hose removed..







The PCV valves are plastic and are 22mm. When installing the new valves just get them nice and snug not too tight







Valves removed and new clamps installed…



















Now install engine cover and you are done!



Old PCV valve... Notice the difference in sound of the valve opening and closing?



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New PCV valve....



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scottsbro23

New Member
Nice Job POOT!



I deffinitly need to do this replacement...matter of fact I think I lost one of the OEM clamps on the passenger side hose.
 

TitanCanuck

New Member
same here, mine are leaking as well.....gonna pick up the new ones tomorrow!!



maybe I will let Steve help me...lol
 

krh2

Administrator

honeykeeper

New Member

krh2

Administrator
[quote name='honeykeeper' post='140629' date='Feb 12 2009, 08:26 PM']Oh yes there is.....one can of carb cleaner I have on the mountain.... <img src='http://www.titanspot.com/Titan/public/style_emoticons/<#EMO_DIR#>/004.gif' class='bbc_emoticon' alt=':smt003' />[/quote]



Dont you dare spray any of that stuff! Sheesh.. <img src='http://www.titanspot.com/Titan/public/style_emoticons/<#EMO_DIR#>/009.gif' class='bbc_emoticon' alt=':smt004' /> <img src='http://www.titanspot.com/Titan/public/style_emoticons/<#EMO_DIR#>/003.gif' class='bbc_emoticon' alt=':smt017' />
 

honeykeeper

New Member
[quote name='krh2' post='140627' date='Feb 13 2009, 12:20 AM']Prolly like chit.. BTW there are no aftermarket valves available. You have to go Nissan or nuttin... <img src='http://www.titanspot.com/Titan/public/style_emoticons/<#EMO_DIR#>/009.gif' class='bbc_emoticon' alt=':smt009' />[/quote]



Nuttin's changed in 30 years...

Just removed the pcv valves with 81,775 miles and cleaned them with carb cleaner. No signs of oil leakage on the manifold but the valves were clogged. Three blasts of the carb cleaner on both sides and good to go with the "rattle" back in the can again.... <img src='http://www.titanspot.com/Titan/public/style_emoticons/<#EMO_DIR#>/001.gif' class='bbc_emoticon' alt=':smt003' />

I used a 23 mm wrench but pliers would work too..... <img src='http://www.titanspot.com/Titan/public/style_emoticons/<#EMO_DIR#>/004.gif' class='bbc_emoticon' alt=':smt004' />



My local NISSAN dealer sells the valves for $5.63 + tax... <img src='http://www.titanspot.com/Titan/public/style_emoticons/<#EMO_DIR#>/017.gif' class='bbc_emoticon' alt=':smt005' />



Aftermarket:

Beck/Arnley: # 0450350 for $15.99 each

Purolator: # pv1091 ?$$$

AZ: # pcv1015 for $15.99 each



I'm going to pull and clean the pcv valves every 12K after seeing them.
 

krh2

Administrator
[quote name='honeykeeper' post='151013' date='Jul 20 2009, 10:12 AM']Nuttin's changed in 30 years...

Just removed the pcv valves with 81,775 miles and cleaned them with carb cleaner. No signs of oil leakage on the manifold but the valves were clogged. Three blasts of the carb cleaner on both sides and good to go with the "rattle" back in the can again.... <img src='http://www.titanspot.com/Titan/public/style_emoticons/<#EMO_DIR#>/001.gif' class='bbc_emoticon' alt=':smt003' />

I used a 23 mm wrench but pliers would work too..... <img src='http://www.titanspot.com/Titan/public/style_emoticons/<#EMO_DIR#>/004.gif' class='bbc_emoticon' alt=':smt009' />



My local NISSAN dealer sells the valves for $5.98 each?... <img src='http://www.titanspot.com/Titan/public/style_emoticons/<#EMO_DIR#>/017.gif' class='bbc_emoticon' alt=':smt005' />



Aftermarket:

Beck/Arnley: # 0450350 for $15.99 each

Purolator: # pv1091 ?$$$

AZ: # pcv1015 for $15.99 each



I'm going to pull and clean the pcv valves every 12K after seeing them.[/quote]



So, your valves had no rattle? Wow! Look into a Catch can. Not that that would save your valves but if you plan on handing down (wait you dont have kids) driving the T forever it might be a good mod.. <img src='http://www.titanspot.com/Titan/public/style_emoticons/<#EMO_DIR#>/002.gif' class='bbc_emoticon' alt=':smt004' />
 

DClights

New Member
man why do you have to do write-ups that make everything look so easy <img src='http://www.titanspot.com/Titan/public/style_emoticons/<#EMO_DIR#>/012.gif' class='bbc_emoticon' alt=':smt004' /> <img src='http://www.titanspot.com/Titan/public/style_emoticons/<#EMO_DIR#>/003.gif' class='bbc_emoticon' alt=':smt003' /> Cause the easier that you make them look the more likely it is I am going to try this <img src='http://www.titanspot.com/Titan/public/style_emoticons/<#EMO_DIR#>/003.gif' class='bbc_emoticon' alt=':smt005' />
 

honeykeeper

New Member
[quote name='krh2' post='151040' date='Jul 20 2009, 10:39 PM']So, your valves had no rattle? Wow! Look into a Catch can. Not that that would save your valves but if you plan on handing down (wait you dont have kids) driving the T forever it might be a good mod..
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honeykeeper

New Member
Two more notes:

1- Don't forget to remove and spray the lines/hoses out with the carb cleaner when you clean or replace the PCV valves.

2- Stick some rags in between the intake manifold pipes in the pcv area when changing the pcv valves to prevent an accident like dropping one...it's a long way down in the valley where the starter lives.... <img src='http://www.titanspot.com/Titan/public/style_emoticons/<#EMO_DIR#>/009.gif' class='bbc_emoticon' alt=':smt009' /> <img src='http://www.titanspot.com/Titan/public/style_emoticons/<#EMO_DIR#>/005.gif' class='bbc_emoticon' alt=':smt013' />
 

titanbiotch25

New Member
well i replaced both pcv valves today, and good thing no rattle what so ever!! found new one's at auto zone, 15 bucks each. the new ones i got don't rattle a lot but there is a rattle! is there any diff between oe/aftermarket?
 

honeykeeper

New Member
[quote name='titanbiotch25' post='151210' date='Jul 26 2009, 08:55 PM']well i replaced both pcv valves today, and good thing no rattle what so ever!! found new one's at auto zone, 15 bucks each. the new ones i got don't rattle a lot but there is a rattle! is there any diff between oe/aftermarket?[/quote]



How many miles did you have on them? I'm going to clean mine every 12,000 miles. OEM pcv valve is $5.63 + tax at my NISSAN dealer.
 

titanbiotch25

New Member
i just hit 65000 miles with the original pcv's. oops!! lol who would of thought the stealer would be cheaper.... not me! with all the other crapola going on i just spaced the pcv's. but they are done now.
 

noahsark6454

New Member
So hi, I'm new to this forum. This write up was very useful. Sorry for rekindling this thread but I've got a quick question (hopefully). I've got a 07 King Cab SE 4X4 flex fuel with about 150k. A P0153 code popped up,I replaced the B2S1 (bank 2 sensor 1) O2 sensor, cleared the code and it came back. I then tried cleaning the fuel system, checking for obvious bad wires, vacuum leaks and couldn't find anything. I came across this post and replaced both PCV valves (never been replaced or cleaned) I cleared the code and about 50-75 miles the same code showed as pending, then it disappeared no fault codes? And now I have forward/driverside exhaust leak. So my question is why/how would old PCV valves possibly pop the P0153 code? Sorry for the rant, just wanted to give the whole story. Thanks for any help.
 
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