Exhaust system

Description - Exhaust Pipes, Catalytic Converter, Mufflers

Issues - Exhaust Pipes, Catalytic Converter, Mufflers

• Occasionally the exhaust system will develop an annoying rattle. This may be a simple loose bracket or clamp. However W220's are known to have an issue with the catalytic converters which come apart internally and make a loud rattling sound.
• Catalytic converters must not be disposed of as regular scrap. The catalytic converter contains valuable rare earth metals, which can be recycled.

Solutions - Exhaust Pipes, Catalytic Converter, Mufflers

• To investigate an annoying rattle jack the vehicle up and place on stands. (TIP: You may find that When you put the car up on front jack stands only, it will not rattle. One BenzWorld enthusiast Had to level out the back of the car to get the rattle going.)

• Tap the exhaust system with a rubber mallet while listening for the rattle. If you are lucky it is often a broken strap or bracket making the noise. If you are unlucky you may have the dreaded interval issue with the catalytic converters.

Tips - Exhaust Pipes, Catalytic Converter, Mufflers

• When reassembling a new or repaired exhaust system apply high temperature anti-seize copper grease to all the gaskets, seal rings, flange surfaces, and bolt threads. You will really appreciate having done this next time the system has to come apart.
• Also cover all exposed bolt threads with silicon to prevent corrosion. The silicon is easily peeled off before undoing the next time. If you have previously used the copper anti-seize grease you will be able to undo the nut by hand.

Parts - Exhaust Pipes, Catalytic Converter, Mufflers

• 210 Seal Ring Catalyst on Flange Right 1269970041 and 2024920181
• 220 Seal Ring Catalyst on Flange Left 140920281 and 202490281
• 245 Seal Ring Left to Right Pipe to Exhaust Pipe 2024920281 ie same as 220 Seal Ring Catalyst on Flange Left

DIY Procedures - Exhaust Pipes, Catalytic Converter, Mufflers

• To investigate an annoying rattle jack the vehicle up and place on stands. (TIP: You may find that When you put the car up on front jack stands only, it will not rattle. One BenzWorld enthusiast Had to level out the back of the car to get the rattle going.)

• Tap the exhaust system with a rubber mallet while listening for the rattle. If you are lucky it is often a broken strap or bracket making the noise. If you are unlucky you may have the dreaded interval issue with the catalytic converters.