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
March, 15, 2009 AT 8:57 AM
FUEL FILTER/FUEL PRESSURE REGULATOR Removal & Installation (Grand Cherokee) 1. Fuel filter/fuel pressure regulator is located on body next to fuel tank. Perform FUEL SYSTEM PRESSURE RELEASE . Disconnect battery cable. Raise and support vehicle. Clean fittings. Disconnect 3 fuel lines. See FUEL LINE DISCONNECT FITTINGS . Remove bolts and fuel filter/fuel pressure regulator. 2. To install, reverse removal procedure. Ensure "O" rings are installed onto fittings. Apply a small amount of engine oil to "O" rings to ease installation. Start engine and check for leaks. Removal (Except Grand Cherokee) 1. Fuel filter/fuel pressure regulator is mounted in gasket on top of fuel pump module. Fuel pump module is located on top of fuel tank. See Fig. 24 . 2. Manufacturer recommends removing fuel tank for access to fuel filter/fuel pressure regulator. See FUEL TANK . Ensure area around fuel filter/fuel pressure regulator and fuel pump module is clean. 3. Note direction of fuel supply line in relation to fuel tank. Remove fuel supply line from fuel filter/fuel pressure regulator. Remove retainer clamp from top of fuel filter/fuel pressure regulator. See Fig. 25 . Discard retaining clamp. Fig. 24: Locating Fuel Pump Module & Components Courtesy of CHRYSLER CORP. Fig. 25: Removing Fuel Pump Retaining Clamp Courtesy of CHRYSLER CORP. 4. Using 2 screwdrivers, pry fuel filter/fuel pressure regulator from gasket on fuel pump module. Discard gasket. Ensure 2 "O" rings are still on fuel filter/fuel pressure regulator fuel inlet tube. See Fig. 26 . If lower "O" ring is not on fuel filter/fuel pressure regulator fuel inlet tube, remove "O" ring from fuel inlet passage on fuel pump module. Installation 1. Apply a small amount of engine oil onto "O" rings. DO NOT install "O" rings separately into fuel pump module. "O" rings will be damaged when installing assembly. Install NEW gasket on fuel pump module. Install fuel filter/fuel pressure regulator into fuel pump module until it snaps into position. Rotate fuel filter/fuel pressure regulator to install fuel supply line. Install fuel supply line. 2. Install NEW retainer clamp. To install, remaining components, reverse removal procedure. Reinstall fuel tank. See FUEL TANK . Fig. 26: Locating Fuel Filter/Fuel Pressure Regulator "O" Rings Courtesy of CHRYSLER CORP. Page 1 of 1 REMOVAL, OVERHAUL & INSTALLATION -2000 Jeep Cherokee Classic 3/15/2009
March, 15, 2009 AT 6:56 PM
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.