Withdrawal
Raise the car.
Coat all bolted connections with rust remover. Wait some time for the action of the solvent.
Remove lambda probe. Unbolt the front pipe from the bottom of the exhaust manifold.
Support the exhaust system with a wooden prop.
Unbolt the exhaust system support from the gearbox.
Unscrew holder 16 (Figure W - 2612) suspension on the rear axle.
Unscrew brackets 1.
Pull out the complete exhaust system.
Installation
Before installing the exhaust system, check whether the exhaust manifold flange is bent and straighten if necessary.
Install lambda probe.
Coat the exhaust manifold studs with copper paste
Slide the pre-silencer over the catalytic converter, screw the flanges with new gaskets. Tighten the bolts slightly. If required, sand the parts before assembly. When assembling the pipes, make sure that the O-rings are in the correct position. Be sure to replace self-locking nuts.
Attention: It is recommended to cover all bolts and nuts with a high temperature paste, for example, Liqui Moly LM-508-ASC, then it will be easier to unscrew them later.
Insert the exhaust system and screw onto the holders without tightening the bolts.
Screw the front pipes to the exhaust manifold. On the M30 engine, tighten the coupling springs to a torque of 10 Nm until the coils of the springs are in contact. Then loosen the nuts 1½ turns.
Caution: The flanges must be parallel and the springs must not be under tension against the block. Due to the danger of constriction, a longer pipe (with compensator) pull the last one.
Before tightening, align the system so that a distance of at least 25 mm from the body is ensured everywhere.
Fasten the mounting brackets so that they are under the tension of the rubber hangers. To do this, with the bracket released, move the muffler slightly forward (about 7 mm).
Tighten all bolts and nuts.
Tightening torques for threaded connections of the exhaust system:
Start the engine and check the tightness of the exhaust system by covering the exhaust pipe with a rag.
Lower the car.