Upper arm rear suspension — removal, repair and installation (BMW 3 Series E46)

Note: When installing you will need a new bolt and nut to secure the upper arm to the subframe.

Removal

1. Remove the suspension spring (see paragraph 12).

2. Unscrew the bolt securing the longitudinal arm to the transverse arm (Fig. 14.2). Remember the location of the bolt.



3. Support the final drive unit with a jack (see chapter 8). Loosen the final drive mounting bolts so that the assembly can be moved when removing the axle bolt. Alternatively, remove the drive shaft (see chapter 8).

4. Loosen the nut of the axle bolt connecting the wishbone to the subframe. Remove the bolt by slightly moving the final drive assembly back and remove the wishbone from the vehicle (Fig. 14.4). Note that on some models this requires disconnecting the propeller shaft.

Note: If you remove the lever for an indefinite period of time, reinsert it and tighten the final drive mounting bolts securely.

Repair

5. Thoroughly clean the lever and the area around the fasteners. Remove all traces of dirt and sealant. Check for damage, wear, paying particular attention to the support bushings. If the bushings need replacing, contact a specialized service station, as this work requires a hydraulic press and a set of spacer bushings (for pressing in new bushings).

6. Inspect the bolts and make sure they are not damaged or worn. Replace the bolts if necessary. The bolt and nut that secure the arm to the subframe must be replaced regardless of their condition.

Installation

7. Install the lever in place, insert the new axle bolt securing the lever to the subframe and screw on the nut. Do not tighten the nut yet.

8. Install the main gear in place and tighten its mounting bolts to the required torque. Connect the cardan shaft to the main gear (if it was disconnected).

9. Insert (from the rear) the bolt securing the upper arm to the trailing arm, screw it on (but don't delay) nut.

10. Install the suspension spring (see paragraph 12).

11. Once assembly is complete, lower the vehicle to the ground and rock it to ensure that the suspension assemblies are in working position. Tighten the wheel mounting bolts, lower shock absorber support bolt, and wishbone axle bolts to the specified torque.

Note: After completing the work, check and, if necessary, adjust the rear wheel alignment angles.

The original source of the article is on the website BMWMAN.ru