Replacing the cathode collector (Priora 2170)

The nuts securing the exhaust manifold to the cylinder head are difficult to access. In addition, the flange of the exhaust manifold is sealed with a metal-reinforced gasket. The sealing gasket must be replaced every time the connection is disassembled. Before removing the exhaust manifold, you need to remove the intake manifold - this will make it easier to access its mount.

1. Remove the decorative engine cover (see "Removing and installing the decorative engine cover").

2. Remove the wire from the negative terminal of the battery.

3. Disconnect the exhaust pipe of the additional muffler from the exhaust manifold by unscrewing the nuts securing the exhaust pipe flange to the exhaust manifold flange and removing the exhaust pipe flange from the exhaust manifold flange studs (see "Replacing the additional muffler").

4. Remove the air filter (see "Removing and installing the air filter").

5. Remove the air supply hose and three crankcase ventilation hoses (see "Cleaning the crankcase ventilation system").

6. Disconnect the four connectors of the ignition module wiring harness and move the harness to the side. Remove the ignition modules (see "Removing and installing ignition coils").

7. Remove the throttle assembly (see "Removing and installing the throttle assembly").

8. Remove the intake manifold (see "Replacing the cylinder head cover gasket").

9. Disconnect the control and diagnostic oxygen concentration sensor wiring harness connectors from the engine harness…

10. …and disconnect the holders of the control and diagnostic oxygen concentration sensor wire harnesses from the steering gear heat-insulating shield.

11. Unscrew the three nuts securing the steering gear heat-insulating shield to the engine shield and remove the shield.

12. Unscrew the two nuts securing the water pump inlet pipe bracket, unscrew the bolts securing the catalytic converter to its mounting bracket, unscrew the eight nuts securing the catalytic converter to the cylinder head and remove the catalytic converter. Disconnecting the catalytic converter from the cylinder head and its defect detection are described in detail in the subsection "Replacing the catalytic converter gasket".

13. Remove the exhaust manifold sealing gasket from the cylinder head studs.

Attention! Be sure to replace the sealing gasket of the exhaust manifold and intake pipe with a new one each time the connection is disassembled.

14. Clean the cylinder head and catalytic converter flanges from any remaining old gasket and carbon deposits.

15. Remove both oxygen sensors from the catalytic converter and install them on the new catalytic converter.

16. Install the exhaust manifold and all removed parts and assemblies in the reverse order of removal.

Note: To prevent the gasket from sticking and to improve its tightness, we recommend that you lubricate the gasket on both sides with a thin layer of graphite grease before installation.