Breathers on top of valve cover-4.0 - Jeep Cherokee Forum
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Breathers on top of valve cover-4.0

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Old 09-03-2009, 03:44 PM   #1
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Default Breathers on top of valve cover-4.0

What will happen if you don't have them connected? I dont have the stock airbox, or the proper hoses to hook them back up to the intake so i just have hose on them venting to the atmosphere.

will this cause issues with vacuum if the crank case is not sealed?
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Old 09-03-2009, 04:10 PM   #2
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the back one should be connected to the intake hit up a j yard and see if you can find the tube.
the front one you cant get a breather filter for and will be just fine
see pic you can see the breather filter dont mind the arrows.
thats in my zj which has more room under the hood for it to fit like that.
on an xj you might need to get the elbow and put it on the end of the elbow
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Old 09-03-2009, 06:48 PM   #3
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it can be done but is NOT emission compliant.......also since you dont have a vacuum source pulling the CCV gases out of the crankcase oil gets dirty quicker.......
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Old 09-03-2009, 07:26 PM   #4
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water ingestion is also a possibility
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Old 09-03-2009, 08:12 PM   #5
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Yes i tried that for about a week and the mess of the oil coming from the breather filter isnt worth it i put it back to stock alot cleaner and safer when going offroad less chance to suck water other then having a snorkel.
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Old 03-12-2011, 09:45 PM   #6
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Could I put anothe pcv valve in the breather hole?? I'm missing my "breather" The old one looked like a pcv valve from what I could tell...
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Old 03-12-2011, 11:13 PM   #7
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one breather (open) and the other needs to be a valve, the valve is a one way valve. if you put one in both it wont vent/close properly. one vent, one valve.
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Old 03-21-2011, 07:15 PM   #8
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where can u get the front and back breathers? i busted mine
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Old 03-21-2011, 07:18 PM   #9
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the back does not have pcv. the 4.0 doesnt use it. Theyre both open grommets.
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Old 03-21-2011, 07:24 PM   #10
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Quote:
Originally Posted by Defiance665 View Post
the back does not have pcv. the 4.0 doesnt use it. Theyre both open grommets.
^^^x2

CCV = Constant Crankcase Ventilation

No valves involved, only open grommets with a constant stream of fresh air going through the system.
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Old 03-21-2011, 07:27 PM   #11
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so front is just unrestricted air flow, and the back pulls the gas vapors out then?
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Old 03-21-2011, 08:36 PM   #12
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Quote:
Originally Posted by 98 JeepJeep View Post
it can be done but is NOT emission compliant.......also since you dont have a vacuum source pulling the CCV gases out of the crankcase oil gets dirty quicker.......
I believe the fat hose in the front is air moving into the valve cover, and the small hose pulls air out and into the intake. I don't have a diagram or anything, but I don't see how a vacuum hose could push air. Thusly, putting a breather on it would act just the same as the tube that runs to the air filter
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Old 03-22-2011, 12:14 AM   #13
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Quote:
Originally Posted by truckntractorhick View Post
where can u get the front and back breathers? i busted mine
I don't know other then the dealer. but you might fond them in the misc breathers the autozone has or online.

Quote:
Originally Posted by Defiance665 View Post
the back does not have pcv. the 4.0 doesnt use it. Theyre both open grommets.
Interesting. I was told it did, havent had one out of the cover to see. I actually don't think I have even seen a system with it constantly venting.
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