Fig. 100. Elements of the front part of the exhaust system: 1 - Engine thermal protection screen; 2 - two-piece exhaust manifold; 3 - lifting eye; 4 - nut, 40 Nm; 5 - Engine thermal protection screen; 6 - Engine thermal protection screen nut; 7 - gasket, for replacement; 8 - intake pipe; 9 - nut, 10 Nm; 10 - nipple for connecting the EGR system, 35 Nm
The exhaust manifold 2 (Fig. 100) consists of two parts and has two separate gaskets 7. A fitting 10 is screwed into the manifold for connecting the exhaust gas recirculation (EGR) system.
The exhaust manifold can be removed after the heat shield 5 has been removed and both inlet pipes 8 have been disconnected.
The exhaust manifold is installed in the reverse order of removal, while observing the following recommendations:
- always replace the gasket between the engine and the exhaust manifold. When installing a new gasket, make sure it is installed in the correct position;
- always replace the self-locking nuts 4 that secure the exhaust manifold to the engine. They should be tightened to 40 Nm;
- replace the gaskets 7 between the intake pipes and the halves of the exhaust manifold. The nuts connecting the exhaust manifold and the intake pipes are self-locking and should therefore always be replaced. Tighten the nuts to a torque of 40 N·m.
Fig. 101. Elements of the middle part of the exhaust system (located between the inlet pipe and the catalytic converter muffler): 1 - heat shield nut; 2 - thermal protection screen; 3 - direction to the first muffler; 4 - catalyst; 5 - protective clamp; 6 - thermal protection screen; 7 - bolt, 10 Nm; 8 - protective clamp; 9 - bolt, 10 Nm; 10 - nut, 40 Nm; 11 - lambda probe; 12 - black plug connector
Catalytic converter 4 (Fig. 101) is installed after the exhaust pipe. It looks like a "swollen" muffler and consists of a large number of metal or ceramic honeycombs that are coated with platinum or similar metals. Exhaust gases pass through these honeycombs. Platinum accelerates the chemical reaction in which harmful gaseous waste is converted into harmless gases. Lambda probe 11 installed in front of the catalyst constantly measures the amount of harmful CO gas contained in the exhaust gases and transmits information to the ECU in the form of electrical signals, on the basis of which the required adjustment is made, i.e. the composition of the combustible mixture is changed.
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