Exhaust Gas RECIRCULATION System
| ITEM | DESCRIPTION |
|---|---|
| 1 | Actuator rod |
| 2 | Cooler bypass valve vacuum actuator |
| 3 | Vacuum connection |
| 4 | EGR intake tube |
| 5 | Cooler |
| 6 | Valve housing |
| 7 | Coolant intake connection |
| 8 | Electrical connector |
| 9 | EGR valve motor |
| 10 | EGR outlet tube connection |
| 11 | Coolant outlet connection |
The EGR system comprises an EGR cooler and valve housing assembly bolted to each cylinder head, above the exhaust manifolds. Each EGR cooler and valve housing assembly incorporates an EGR valve and motor, an EGR cooler, and a cooler bypass valve and actuator.
On each valve housing, an EGR intake tube is connected to the exhaust manifold and directs exhaust gasses into the valve housing. A second pipe from the valve housing connects to the electric throttle and passes the exhaust gasses into the electric throttle to mix with the clean air entering the engine from the turbochargers.
The EGR cooler is attached to the valve housing with a gasket and 5 screws. The valve housing has an engine coolant connection which allows coolant to flow into a water jacket within the cooler, which cools the exhaust gasses. The coolant returns to the engine cooling system through an outlet pipe on the cooler.