GENERAL INFORMATION AND MAINTENANCE 1-15 To install: 6. Clean the mating surfaces on the header assembly and the filter. Align the widest key slot in the element cap with that in the header assembly, push the element down until the two surfaces make contact, then tighten the nut by hand. 7. Open the air bleed valve on top of the filter assembly. Connect a hose to the bleeder valve and insert the other end into a suitable glass container. 8. Disconnect the fuel injection pump shut-down solenoid wire or the FUEL SOL relay center fuse (whichever applies to your vehicle, then crank the engine in 10-15 second intervals until clear, clean fuel is coming out of the hose. »»Wait about one minute between cranking intervals!
9. Remove the hose and close the bleeder valve. 10. Connect the shut-down solenoid wire or fuse and install the fuel cap. Start the engine and allow it to idle for a few minutes. Check for leaks. 1 2. 3 4 5
Water drain valve Bail wires Fuel filter element Air bleed Filter adapter
6 7 8 9
Air bleed port Restriction switch Fuel heater Water sensor 84901031
Fig. 40 Exploded view of the fuel filter—6.2L engines
FUEL FILTER/WATER SEPARATOR
FILTER INLET HOSE FUEL FILTE'R/WATER SEPARATOR ^
Fig. 41 Fuel filter/water separator—6.2L engines
7. 8. 9. 0. 1 2 4. 5.
PCV Valve > See Figure 43 "•Diesel engines do not utilize a PCV system. The PCV valve, which is the heart of the positive crankcase ventilation system, should be changed as noted in the Maintenance Intervals chart at the end of this section. The main thing to keep in mind is that the valve should be free of dirt and residue and should be in working order. As long as the valve is not showing signs of becoming damaged or gummed up, it should perform its function properly. When the valve becomes sticky and will not operate freely, it should be replaced. The PCV valve is used to control the rate at which crankcase vapors are returned to the intake manifold. The action of the valve plunger is controlled by intake manifold vacuum and the spring. During deceleration and idle, when manifold vacuum is high, it overcomes the tension of the valve spring and the plunger bottoms in the manifold end of the valve housing. Because of the valve construction, it reduces, but does not stop, the passage of vapors to the intake manifold. When the engine is lightly accelerated or operated at constant speed, spring tension matches intake manifold vacuum pull and the plunger takes a mid-position in the valve body, allowing more vapors to flow into the manifold. The valve is either mounted on the valve cover or in the line which runs from the intake manifold to the crankcase. Do not attempt to adjust or repair the valve. If the valve is faulty, replace it.
NUT. ELEMENT ASSEMBLY, ELEMENT ASSEMBLY. HEADER SEAL. WATER SENSOR ASSEMBLY. WATER SENSOR SCREW. SENSOR MOUNTING SEAL. CAP ASSEMBLY. HEATEfl
6. NUT. CAP 8. CAP, AIR BLEED
Fig. 43 PCV valve location-gasoline engines
REMOVAL & INSTALLATION > See Figures 44 and 45
Fig. 42 Exploded view of the fuel filter—6.5L engines
1. Remove the PCV valve from the cylinder head cover or trom the manifold-to-crankcase hose. 2. Visually inspect all hose connections and hoses for cracks, clogs or deterioration and replace as necessary.