Removal and installation of the exhaust system

Exhaust system models 316i, 318i

Exhaust System Models 320i, 323i, 328i

Exhaust System Models 320d

Withdrawal

The operation of lifting and placing the vehicle on stands is dangerous! Therefore, before carrying out the operation, read Section Jacking and towing

1. Raise and place the vehicle on stands. Remove the lower cover of the engine compartment, refer to Section Removal and installation of the bottom cover of an impellent compartment.

2. Spray all exhaust system bolts with rust dissolver. Wait a while for the rust to dissolve.



3. Models 316i, 318i: Turn away bolts of fastening and remove a reception pipe from a flange of a final collector -1-.



4. Models 320i, 323i, 328i: Loosen the mounting bolts and remove the exhaust pipe from the exhaust manifold flange (arrows in the illustration).


5 Models 320d: Loosen the mounting bolts and remove the exhaust pipe from the turbocharger flange.



6. Disconnect the muffler from the manual transmission holder by unscrewing the fastening bolts -1-.

When installing the exhaust system, the bolts -2- are turned away in order to expose the system without constrictions.

7. Models 316i, 318i: Disconnect the connector -3- of the oxygen sensor -4- in the exhaust pipe.

The second oxygen sensor is located in the downpipe behind the catalytic converter. Disconnect the second oxygen sensor connector.

8. Move a garage lift with a wooden pad under the exhaust system. The weight of the system is about 30 kg.



9. Turn away bolts of fastening of a traverse to the bottom (arrows in the illustration).




10. Disconnect both holders of the additional muffler to the bottom (arrows in the illustration).

11. Lower the exhaust system and remove it.

The catalytic converter is sensitive to shock. Handle it with care, avoid bumps and drops.

Installation

When installing elements of the exhaust system, make sure not to crush the pipes. Otherwise, incorrect results may be obtained during the analysis of exhaust gases.

Bolts, fastening nuts and seals must be replaced with new ones. Rubber holders should also be replaced with new ones if they have pores or deformations.

1. It is recommended to lubricate the mounting bolt threads with high temperature copper grease such as Liqui Moly LM-508-ASC. This will make it easier to disassemble for repairs.

2. If mufflers are not replaced, the sealing surfaces must be sanded to remove residues of combustion products and gaskets before assembly.

3. Align the exhaust system so that there is a gap of at least 25 mm in relation to the bottom everywhere. In addition, the end of the pipe must have a uniform clearance in relation to the contour of the rear body.


4. Install the traverse, tighten the fastening bolts to 20 Nm.

5. Diesel engine: Fasten the downpipe to the turbocharger with a torque of 30 Nm. Check the O-ring first, replace it if necessary. Lubricate the ring with high temperature grease.

6. Petrol engine: Install the exhaust pipe on the exhaust manifold with a new seal and evenly tighten the nuts with a torque of 30 Nm.



7. Turn away bolts -2 - fastenings of the muffler to RKPP. Tighten the bolts only after installing all other fasteners to prevent deformation.

8. Tighten all fastening bolts and nuts to the torque given in the Specifications.

9. Models 316i, 318i: Connect the plug connections of the oxygen sensors and lay the cable.

10. Check the tightness of the exhaust system, refer to the relevant section.

11. Install the bottom cover of the engine compartment, refer to Section Removal and installation of the bottom cover of an impellent compartment.