exhaust question ml320 2000 - Mercedes-Benz Forum

 
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post #1 of 8 (permalink) Old 06-02-2014, 08:40 PM Thread Starter
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Smile exhaust question ml320 2000

a rattling noise has started inside the resonator. It only happens when it is idling in drive. the object in question is on the left side of the exhaust system. there is the catalytic convertor then the resonator than another muffler like compartment than it connects to the muffler. The other muffler like compartment is where the rattling is occurring. The dealer tells me its all one part. Is there a safety issue if I don't repair this right away. The noise is annoying but the cost is also a bit more annoying at this time. ml320 2000 200,000 miles.
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post #2 of 8 (permalink) Old 06-02-2014, 11:04 PM
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I believe your are talking about the second cat. There are 2 on each side.

Please tell us which number on this diagram you are referring to.
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post #3 of 8 (permalink) Old 06-02-2014, 11:46 PM
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there is the catalytic convertor then the resonator than another muffler like compartment than it connects to the muffler. The other muffler like compartment is where the rattling is occurring. ... Is there a safety issue if I don't repair this right away. The noise is annoying but the cost is also a bit more annoying at this time.
The 2nd bulge is another catalytic converter. Part of the ceramic honeycomb of the converter has broken off and is rattling around. When exhaust pressure increases, that fragment is trapped by the airflow.

It's not a safety issue and won't cause increased damage if you put up with it. You can buy a remanufactured cat cheaper than a new one. Works the same. --> CATALYST. REMANUFACTURED. EXHAUST SYSTEM USED ON SIX-CYLINDER GASOLINE VEHICLES. 2000 Mercedes ML 320 # 163490971488

Last edited by DrX; 06-03-2014 at 05:56 PM.
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post #4 of 8 (permalink) Old 06-03-2014, 06:12 AM Thread Starter
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On the diagram its number 5, the third part after the exhaust manifold. Is it another catalytic converter?
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post #5 of 8 (permalink) Old 06-03-2014, 12:20 PM
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That is the catalytic pipe which contains both the upstream and downstream cats. It is usually sold as one whole pipe. The price is alarming. Seeing as you are not in California you can get an aftermarket one for $1000 less than one from MB.
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post #6 of 8 (permalink) Old 06-03-2014, 05:55 PM
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The remanufactured cat for your MY2000 is only $420 full RRP. The catalyst is made of rare earth minerals which don't come cheap.

I see that part #5 has 2 bulges which contain the catalyst, then a 3rd section which is where the rattle is. The 3rd section is not another cat, but it has caught the fragment from the 2nd cat. Doesn't matter anyway as you need to replace the whole assembly.
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post #7 of 8 (permalink) Old 06-18-2014, 11:01 AM Thread Starter
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how difficult is it to remove the torsion bar? Special instructions on replacing the torsion bar.
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post #8 of 8 (permalink) Old 06-18-2014, 12:19 PM
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how difficult is it to remove the torsion bar? Special instructions on replacing the torsion bar.
http://www.benzworld.org/forums/w163...converter.html

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