# Gear Selector shaft seal, replace.

Support exhaust system
Remove nuts from header flange. |
Loosen 13mm bolts on brackets and remove rubber hangers from rear cross member |
Remove muffler bracket and lower exhaust from car.
Remove the three 17mm nuts and bolts securing the "Guibo" coupling to the transmission. Leave the Guibo attached to the driveshaft. |

Loosen threaded ring at center support. This is best achieved with two large pairs of pliers, apply one set of pliers to the threaded ring (green arrow) and the second set to the weld in the driveshaft tube (yellow arrow). The weld is a rough surface and gives good grip, preventing the pliers from slipping and scarring the tube. It is also the strongest section of the tube.

Loosen ring approximately 5 turns.

CAUTION: Do not allow driveshaft to contact fuel transfer pipe between fuel tank halves.
CAUTION: Drive shaft is balanced as a unit, do not separate the two halves without marking them for correct re-assembly.
Tie drive shaft out of the way, in such a manner that no stress is put on the center universal joint.
Pry locking ring off selector knuckle joint. |
Push pin up and out of knuckle joint, slide joint off selector shaft.
Pry out seal with small pick or screwdriver.
CAUTION: Take care not gouge aluminum seal housing during removal.

### Installation:

Install new seal with a deep 13/16" 12 point socket. Place seal so that it is flush with the aluminum housing.
Replace knuckle joint if there is excess play. Replace foam pad in knuckle to reduce noise transmitted through shifter.
Replace gasket and nuts at exhaust manifold flange. Use copper nuts.
Install manifold nuts and muffler bracket, and tighten to correct torque before installing other mounts.
Correctly positioned exhaust must have tailpipes in center of opening in rear valance. |
Install rubber hanger and bracket at rear sub-frame and position bracket so that rubber hanger has slight tension only.

### Torques

Center support : | : | 22 Nm (16 ft lbs.)
Guibo : | : | 10mm 8.8 bolts, 46 Nm (33 ft lbs.) ; 10mm 10.9 bolts, 72 Nm (52 ft lbs.) ; 12mm bolts, 123 Nm (89 ft lbs.)
Threaded sleeve : | : | 17 Nm (12 ft lbs.)
Pipe to manifold | : | Step 1, 30 Nm (22 ft lbs.) Step 2, 50 Nm (26 ft lbs.)
Muffler brackets | : | 14 Nm ( 10 ft lbs.)
Hanger bracket to rear sub-frame | : | 22 Nm (16 ft lbs.)

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