Audi Workshop Service and Repair Manuals

Removing and installing catalytic converter with centre silencer

Removing –  Remove bolts -arrows- and detach heat shield for turbocharger.

–  Remove nuts -arrows- for catalytic converter. –  Move clear electrical wiring harness leading to alternator at catalytic converter.

–  Remove noise insulation -1- → Rep. gr.66.

–  Remove electrical connector -4- for Lambda probe -G39- from bracket and unplug connector.   Note Disregard -items 1, 2, 3-.

–  Move clear electrical wiring harness at catalytic converter. –  Remove bolts -1-. –  Press mountings -2- for exhaust system off pins.

–  Unscrew nuts -arrows- and push clamp towards rear. –  Detach catalytic converter with centre silencer from underneath. Installing Installation is carried out in the reverse order; note the following: l  Tightening torques → Chapter „Silencers - exploded view“   Note Renew gasket and nuts.

–  Note sequence for installing catalytic converter:   Caution Avoid damage to flexible joint. While the catalytic converter is being secured to the engine, a second mechanic must take hold of the centre silencer to take the load off the flexible joint. –  Secure catalytic converter in 6 stages as follows:

Stage	Bolts/nuts	Tightening torque
1.		Insert centring lug -1- on catalytic converter in hole in cylinder block -arrow-.
2.		Fit catalytic converter onto studs of turbocharger.
3.	-2-	Screw in by hand until it makes contact
4.	-3-	Tighten
5.	-4-	Tighten
6.	-2-	Tighten

–  Engage centre silencer in rubber mountings. –  Align the exhaust system so it is free of stress → Chapter. –  Install noise insulation → Rep. gr.66. –  Install heat shield for turbocharger → Chapter.