VALVE - EGR 2.8L DIESEL
DESCRIPTION
| EGR AND AIR CONTROL VALVE |
| 1 - REAR OF INTAKE MANIFOLD | 4 - EGR VALVE COOLER |
| 2 - AIR INLET ELBOW | 5 - EGR VALVE |
| 3 - EGR AIR CONTROL VALVE | 6 - ENGINE |
The EGR system consists of:
- EGR valve
- Air Control Valve
- EGR cooler
The EGR valve and cooler are located under the intake manifold toward the left rear of the engine. The air control valve is located in the charge air inlet before the intake manifold.
OPERATION
The EGR system reduces oxides of nitrogen (NOx) in engine exhaust. Formation of NOx increases proportionally with combustion temperature. To reduce the emission of these oxides, the cylinder temperature must be lowered. The system allows a predetermined amount of hot exhaust gas to recirculate and dilute the incoming charge air. The diluted air mixture reduces peak flame temperature during combustion. The EGR cooler further reduces these temperatures.
REMOVAL
1. Disconnect the negative battery cable.
2. Remove engine cover.
3. Drain cooling system.
4. Disconnect the electrical connector at EGR valve.
5. Disconnect coolant hoses at EGR valve (1) and cooler (5).
6. Disconnect tube at the EGR valve housing.
7. Remove EGR valve housing to engine block fastener.
8. Remove EGR valve and cooler assembly from vehicle.
9. Remove EGR valve to cooler retaining bolts and separate EGR valve from cooler.
INSTALLATION
1. Clean all gasket mating surfaces.
2. Assemble EGR valve (1) and cooler (5) to housing (3). A new gasket should only be required if the cooler has been replaced. Torque bolts to 11 N·m (95 in.lbs.).
3. Install EGR valve/cooler assembly to head and tighten bolts to 24.5 N·m (216 in. lbs.).
4. Install EGR tube to EGR assembly and tighten bolts to 32 N·m (24 ft.lbs).
5. Tighten EGR tube clamps to 7 N·m (62 in. lbs.).
6. Connect the EGR cooler hoses.
7. Refill cooling system.
8. Install engine cover.
9. Connect negative battery cable.