Exhaust system — design description (BMW X5 E53)

The exhaust system includes an exhaust manifold, a turbocharger (TC), a three-way catalytic converter, extinguishers, an exhaust gas recirculation system, pipelines with system fastening elements on the vehicle body. The M57TU engine is additionally equipped with a particulate filter. The exhaust manifold (Fig. 6.18) has a flange connection with the engine cylinder head on studs, using asbestos-free sealing gaskets (2.5). The exhaust manifold is covered with a heat shield (6).



The exhaust manifold, TC and inlet pipe are connected with bolts on flanges. The fastening elements for the exhaust system (Fig. 6.19) are threaded connections, clamps, retaining rings and rubber-metal hinges, which must be replaced each time the system as a whole is disassembled or its individual elements are replaced.



The catalytic converter used (1) is a so-called three-component catalytic converter based on rare earth metals. Due to their presence, oxidation of carbon oxides (CO) and hydrocarbons (HC) occurs, and the concentration of nitrogen oxides (NOx) is reduced.