# Differential Mount, replace

There are two methods of replacing the rear mount, with and without BMW special tools.

### Replacing mount with BMW special tools :

Raise and support the rear of the vehicle.
Disconnect wiring for speedometer (green arrow) and remove harness from securing clip (blue arrow). |
Support differential, remove the two 6mm Allen bolts (green arrows) on each side of the rear sub-frame and loosen the two 22mm nuts (red arrow) on rear sub-frame. Do not remove the nuts, or sub-frame can drop out of car. |
Remove 19mm nut and bolt from rear differential mount. |
Lower differential until bushing is clear of body bracket.
Install BMW special tool 33 2 120 and press out bushing. Bushing is eccentric, ensure correct installation of tool.
Lubricate new bushing with soap and water and install using same special tool. Ensure that bushing is installed in correct orientation.

### Without BMW special tools

Raise and support the rear of the vehicle. |
Disconnect wiring for speedometer (green arrow) and remove harness from securing clip (blue arrow). |
Drain oil from differential |
Support differential and remove 19mm nut and bolt from mount. |
Lower differential until mount is clear of body bracket
Remove 17mm bolts securing rear cover to differential and remove cover.
If a press is available, press out old bushing and press in new.
If no press is available, use a hacksaw or equivalent to cut rubber center from mount, then make two cuts in outer edge of mount. Use a hammer and chisel to knock remnants of old mount from differential cover.
Lubricate the new mount with soap and water, use a piece of wood to protect the mount and knock it into the differential cover with a hammer. Take care to keep the mount even, and in the correct orientation.

### Part Numbers :

Differential Mount | : | 33 17 1 135 242

### Torques :

Differential to rear sub-frame, 19mm bolts | : | 110 Nm (80 ft lbs.)
Differential cover mount to body | : | 87 Nm (63 ft lbs.)
Cover bolts | : | 44 Nm (32 ft lbs.)

E30 M3 Repair Manual V2.7. Copyright ©1999-2001 Koala Motorsport & Brett Anderson