On vehicles with diesel engines, an unregulated oxidative catalytic converter is used to reduce the toxicity of exhaust gases.
Reducing the content of nitrogen oxides in the exhaust gases of a diesel engine is achieved by installing an exhaust gas recirculation system on the car (EGR).
Through the EGR valve on a warm engine, part of the exhaust gases is directed to the combustion chambers of the engine, as a result of which the combustion temperature decreases and the content of nitrogen oxides in the exhaust gases decreases.
Pic. 4.83. Exhaust system on vehicles with DW10TD engines: 1 - clamp, 25 Nm
Elements of the exhaust system are connected by clamps, the fastening bolts of which must be tightened with a torque of 25 Nm (pic. 4.83).
After servicing and repairing the exhaust system, check that the system is installed freely, without stress, with sufficient clearance relative to the body elements.
Attention! When removing the exhaust system, it is necessary to protect the connecting element in the exhaust pipe from any mechanical damage and contact with any corrosive products. The connector in the exhaust pipe must not be bent more than 20°or misaligned by 20 mm axially and 25 mm radially, otherwise it will be damaged.
Before re-assembling the elements of the exhaust system, clean their joints with sandpaper from the remnants of sealant and rust.