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
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Sunday, March 15th, 2009 AT 8:50 AM