Exhaust manifold and three-way catalytic converter 1. Heated oxygen sensor 1; 2. Gasket; 3. Exhaust manifold and three-way catalytic converter assembly; 4. Three way catalytic converter cover; 5. Exhaust manifold cover (lower); 6. Heated oxygen sensor 2; 7. Exhaust manifold cover (top).
Removal and installation
Removal
1. Remove the heated oxygen sensors as follows:
- A. Disconnect the connectors from the heated oxygen sensors and remove the wiring from the bracket and middle clamp.
- b. Unscrew the heated oxygen sensors using a heated oxygen sensor wrench (special tool).
Attention:
- Do not damage the heated oxygen sensor.
- Discard the heated oxygen sensor if it has been dropped on a hard surface, such as a concrete floor. Replace it with a new one.
2. Disconnect the front exhaust pipe. See chapter "Accelerator, fuel system and exhaust system".
3. Remove the generator. See chapter "Electrical equipment".
4. Remove the top cover from the exhaust manifold.
5. Loosen the nuts in the reverse order shown in the illustration and remove the exhaust manifold and three-way catalytic converter assembly.
Note. Ignore #6-10 when weakening.
6. Remove the gasket.
Attention. To prevent foreign particles from entering, seal the openings in the engine.
7. Remove the lower cover from the exhaust manifold and the converter cover from the exhaust manifold and three-way catalytic converter assembly.
Installation
Installation is carried out in the reverse order of removal, taking into account the following:
Exhaust manifold
- If the studs were turned out, screw them in and tighten them to the required torque
. 14.7 Nm (1.5 kg-m)
- Tighten the nuts in the order indicated by the numbers in the figure
Note. Nos. 6-10 mean double tightening of bolts Nos. 1 and 5.
Heated oxygen sensors
Attention:
- Before installing a new heated oxygen sensor, clean the exhaust system threads using a heated oxygen sensor thread cleaner (suitable special tools) and apply anti-seize compound.
- Do not over-tighten the heated oxygen sensor, otherwise you may damage the sensor and cause the malfunction indicator to illuminate «M1».
Check after removal
Surface warping
Using a ruler (A) and feeler gauge (IN) Check whether the contact surface of the exhaust manifold is warped.
Limit: See section below «Technical data and specifications»
- If warpage exceeds the limit value, replace the exhaust manifold.