PCV valve

Tiny
BHOLT4511
  • MEMBER
  • 2000 JEEP CHEROKEE
  • 6 CYL
  • 4WD
  • AUTOMATIC
  • 165,000 MILES
I know the 4.0 doesn't have a PCV valve, is there a part that takes the place of it? My air filter has some blackish residue on it that appears to be blow-by. How do I remedy this?
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Sunday, March 15th, 2009 AT 8:44 AM

4 Replies

Tiny
MERLIN2021
  • EXPERT
CLOSED CRANKCASE VENTILATION SYSTEM 2.5L & 4.0L 1. Closed Crankcase Ventilation (CCV) system is used on both 2.5L and 4.0L engines. CCV system performs same function as a conventional PCV system, but does not use a vacuum controlled PCV valve. CCV system uses a fixed orifice fitting. Ensure locations of fixed orifice fitting and air inlet fitting have not been exchanged. 2. Fixed orifice fitting may be Gray in color and air inlet fitting may be Black in color. On 2.5L, fixed orifice fitting is located on left front side of valve cover and air inlet fitting is located at rear of valve cover. See Fig. 15 . On 4.0L, fixed orifice fitting is located at rear of valve cover and air inlet fitting is located at front of valve cover. See Fig. 16 . 3. On all models, remove fixed orifice fitting from valve cover and leave tube attached. Start engine and let idle. A hissing noise should be heard from fixed orifice fitting. Also, a strong vacuum should be felt with a finger placed at fitting inlet. If vacuum is not present, remove fitting. If vacuum is now present at tube, replace fitting. Do not attempt to clean fitting. If vacuum is not present at tube, go to next step. 4. Check tube for kinks or obstruction. Clean tube fitting at intake manifold, if necessary. A 1/4" drill may be used (by hand) to dislodge any solid particles. Reinstall fixed orifice fitting and tube. Disconnect air inlet fitting and hose from front of valve cover. 5. Hold a piece of stiff paper loosely over opening in valve cover. Allow engine to idle for one minute. Paper should be drawn against rubber grommet in valve cover by vacuum in crankcase. If vacuum is not present, check tubes for restrictions or obstructions. Fig. 15: Locating Closed Crankcase Ventilation Components (2.5L) Courtesy of DAIMLERCHRYSLER CORPORATION Fig. 16: Locating Closed Crankcase Ventilation Components (4.0L) Courtesy of DAIMLERCHRYSLER CORPORATION Page 1 of 1 SYSTEM & COMPONENT TESTING -2000 Jeep Cherokee Classic 3/15/2009


https://www.2carpros.com/forum/automotive_pictures/62217_Jeep_CCV_1.jpg

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+14
Sunday, March 15th, 2009 AT 8:50 AM
Tiny
EXTRUDEDCOW
  • MEMBER
Pulling and cleaning the "fixed orifice fitting" may help reduce the amount of oil that can make it's way through the system. Just remove the tubes from the plastic fitting in the valve cover and pull them out (I believe they turn a quarter to half turn and pull out), then clean any buildup that has accumulated on or in them.
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Sunday, March 15th, 2009 AT 6:56 PM
Tiny
GSPURGEO
  • MEMBER
  • 1997 JEEP CHEROKEE
  • 4.0L
  • 6 CYL
  • 4WD
  • AUTOMATIC
  • 240,000 MILES
PCV valve is brittle. How can I remove without dropping pieces of grommet or valve itself into valve cover? Hard to remove without cracking.
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Friday, February 12th, 2021 AT 12:56 PM (Merged)
Tiny
KASEKENNY
  • EXPERT
Next to impossible. I have been there a couple times and if you cannot get it out without pieces possibly falling in, then I would just remove the valve cover and pull it out on a bench because you will probably have to pull it off and clean out the top of the head if any falls in. So this way, you can pull it off and not have to clean out the head. The other side of it is just go ahead and try to get it out and if any falls in then you are pulling the cover off but you could get lucky.

Let me know if you have any questions. Thanks
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Friday, February 12th, 2021 AT 12:56 PM (Merged)

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