Procedures

Subframe, servicing





WARNING:
Do not attempt to weld and/or straighten the axle beam.

CAUTION:
If using power tools (pneumatic or electric), do not tighten the bolted connections more than hand-tight. Otherwise, the specified tightening torques could be exceeded.

1 - Subframe

Tightening sequence (item -4-):

- 1. Right-rear
- 2. Left-rear
- 3. Right-front
- 4. Left-front

^ Align rear axle after removal and installation
^ Check and if necessary adjust wheel alignment after installing

2 - Bonded rubber bushings

Note:
Apply assembly lubricant G 294 421 A1 before installing.

CAUTION:
Part numbers are listed here for reference only. Always check with your Parts department for the latest information.

3 - Washer

^ Always replace
^ Ribbed side faces upward

4 - Combi-bolt

^ Always replace
^ 110 Nm (81 ft lb) plus additional 1/4-turn (90°)





Fig. 1 Pulling out front bonded rubber bushing from subframe

- Assemble 3291/4 tubular section (pay attention to recesses) together with 3291 assembly device at right angle to subframe.

- Attach two brass washers in such a way that annular grooves are next to one another (3291 assembly device). Install washer and screw on nut.
- Pull out bonded rubber bushing by turning nut.

Note:
Insert hex head of 3291 assembly device into the recess in the 3291/4 tubular section. Apply grease to the annular grooves of the brass washers and to the threaded stem.





Fig. 2 Pressing in front bonded rubber bushing in subframe

- Apply lubricant (e.g. G 294 421 A1) when pressing in bonded rubber bushings.
- Assemble 3291/1 thrust piece to bonded rubber bushing and insert at right angle into hole in subframe using 3291/5 tubular section (pay attention to recesses) and 3291 assembly device.
- Attach two brass washers with annular grooves facing one another and to 3291 assembly device.
- Install washer and screw on nut.
- Press in bonded rubber bushing fully by turning nut.
- While pulling in, hold 3291/1 thrust piece or bonded rubber bushing by hand to prevent turning.

Note:
Insert hex head of 3291 assembly device into the recess of 3291/5 tubular section. Apply grease to the annular grooves of the brass washers and to the assembly device.





Fig. 3 Pulling out rear bonded rubber bushing from subframe

- Assemble 3291/2 tubular section together with 3291 assembly device at right angle to subframe.
- Attach two brass washers with annular grooves next to one another and to 3291 assembly device. Install washers and screw on nut.
- Pull out bonded rubber bushing by turning nut.

Note:
Insert hex nut of 3291 assembly device into recess in 3291/2 tubular section. Apply grease to the annular grooves of the brass washers and to the assembly device.





Fig. 4 Pressing in rear bonded rubber bushing in subframe

- Apply lubricant (e.g. G 294 421 A1) when pressing in bonded rubber bushings.
- Attach 3291/1 thrust piece to bonded rubber bushing and insert at right angle into hole in subframe using 3291/3 tubular section and 3291 assembly device.
- Attach two brass washers with annular grooves next to one another and to 3291 assembly device.
- Install washer and screw on nut.
- Press in bonded rubber bushing fully by turning nut.
- While pulling in, hold 3291/1 thrust piece or bonded rubber bushing by hand to prevent turning.

Note:
Insert hex nut of 3291 assembly device into recess in 3291/3 tubular section. Apply grease to the annular grooves of the brass washers and to the assembly device.





Fig. 5 Installation positions of bonded rubber bushings in rear subframe

Note:
The kidney-shaped recesses (arrows) must be parallel to the center line of the vehicle. Max. deviation of 10° to left or right is permissible.