Removing
1. We prepare the car for work (see «Preparing the vehicle for maintenance and repairs»).
2. Remove the engine mudguard or crankcase protection (if installed).
Attention! To avoid burns, work should be carried out after the parts of the exhaust system have cooled to a safe temperature.
3. We process all threaded connections with penetrating lubricant.
4. Disconnect the additional muffler from the catalytic manifold (see «Additional muffler - replacement»).
5. Disconnect the oxygen concentration sensor pads from the engine compartment wiring harness pads and remove the upper oxygen concentration sensor (see «Oxygen concentration sensor - check and replacement»).
6. Using a 13 mm socket wrench, unscrew the two bolts securing the catalytic manifold to the bracket.
7. Using a 13 mm spanner wrench, unscrew the nuts 1 of the upper mounting of the bracket, and then loosen the tightening of the nut 2 of the lower mounting. Move the bracket to the side (The photo shows a view from the side of the partition of the engine compartment).
8. Using a 13 mm wrench, unscrew the eight nuts securing the catalytic manifold.
9. Remove the catalytic manifold.
10. Remove the gasket from the cylinder head studs.
11. Unscrew the lower oxygen concentration sensor with a 22 mm key (see «Oxygen concentration sensor - check and replacement»).
Comment. On a car that has been in operation for a long time, as a rule, it is not possible to unscrew it without breaking off the heads of the bolts securing the catalytic manifold to the bracket. Also, the bracket itself is damaged by corrosion. In these cases, defective parts must be replaced together with the manifold.
12. Using a 10 mm socket wrench, unscrew the nut 1 for fastening the protective screen and with a 13 mm wrench, two bolts 2 for fastening the upper part of the bracket. Remove part of the bracket.
13. If, due to corrosion, it is not possible to unscrew the bolts, with a 10 mm spanner, unscrew the two bolts 1 securing the protective screen to the gearbox and with a 13 mm socket wrench, unscrew the two bolts 2 securing the catalytic manifold bracket to the cylinder block. We remove the bracket assembly with a protective screen.
Installation
Install the catalytic manifold in reverse order. We replace the gasket and parts damaged by corrosion.