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2007 GL450; 2012 E350 Wagon; 1995 E32000 SL500 sold sad!); 1999 CL500 sold sad;
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Discussion Starter #1 (Edited)
I had an after market trailer hitch installed on my 06 R350, and they did a good job overall. However, I have always had a slight squeak somewhere in the back and it seemed to become more constant over bumps; 70k miles on car.

I asked shop to take a look while up on the wheel alignment machine, but they found nothing; alignment very good though. Cured what I thought was a shock going bad, and a bump steer. Steers straight, no slight bump steer/slight cork screw over bumps. Now rides very normally.

At any rate, I ran the rear tires up on my two 7k #'s rated ramps for look in the rear, where the squeak seems to emanate.

I found some dented heat shields and straightened those. But still kept looking.

Well, loe and behold, there is a bracket that runs between the left and right exhaust pipes and just above the factory X brace for the trailer hitch and just aft of the rear differential. The bracket is factory twisted/bent to provide a clearance for the differential, but the twist takes it near the X brace. This bracket is stamped with a part # (gotta love MB detail).

I found that the movement of the exhausts just barely allowed the exhaust-pipe bracket to come down in contact with the factory hitch X brace. The factory left enough threads exposed in the hold-down bolts for the brace to allow for a couple of washers, which I installed, raising the bracket about 1/8-3/16"'s. Voila no more contact. Note that the bolts have "torx" head configuration, so I picked up a socket set and that was a fit to the bolt head. The bolts screw into the bracket and some welded nuts attached to the bracket. Very sanitary.

I took her out for a run over the types of roads that have been eliciting the squeaks. Gone! These vehicles are amazingly quiet when all fits together correctly.

I think this is going to be one of those MB's that will be rattle free at 300k miles. I also shot some marine grade corrosion fluid around in various places, while I was under there.

That's my report.
 

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'08 MY R320 CDi LWB, '86 Pontiac Fiero SE 2M6, '10 Ford Fiesta 1.25 82 PS Zetec for city driving
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53 Posts
These vehicles are amazingly quiet when all fits together correctly.

Bought mine with 3 months of the original MB warranty still to run - it has since spent 15 days over 4 visits in the MB workshop and must have cost MB 1000s of £s to correct all the original build errors to get rid of all the squeaks and rattles to my satisfaction. How the previous owners lived with them, I don't understand.

It is pretty quiet now.
 
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