My MPV is 5 years old and some noticeable metal clunking was noted over uneven road. Engine noise is also more pronounced at 2,000 rpm. The clunk is like metal knock against metal and happens 0.5 seconds after a bump/ uneven road. Worn engine mount was in my first suspicion but some forum mentioned worn sway bar bushing/ joint and even suspension may cause such clunking. My experience with my Mercedes is that the engine mount will last much longer and will only cause vibration rather than clunk. After thorough hammering, and kicking for loose parts ( jacking up both tyres and hitting , rocking the tyres, connection rods, exhaust pipe ... ) , no postive finding. But then after careful inspection, the motor mount near the engine side (TU31 / QR25 engine has 4 mounts : Font, rear ( not visible from engine bay), engine side, transmission side ), I find the engine mount collapsed by few centimeters and evident from the assymmetry of the rubber on the side. (Photo pending ...)
If you get a new engine mount and you can appreciate the difference.
The collapsed mount causing the metal strut rokcing up and down and hitting the chasis mount and results in clunking.
Replacement is simple and does not need to slip under the car (in which replacement of Mercedes E-class engine mount needs to do so ) .
All you need to replace the engine side engine mount ( Right driver side if you are sitting inside the car) :
1) Foot long 3 inches thick wood, to be placed between the floor jack and the tranny.
2) Floor jack
3) Hex Socket : size 12mm ( to remove the relay box that hinder the access to the engine mount) , 14mm (for the engine mount) . You may need a long 14mm hex socket as one of the screw of the mount is longer than usual.
4) A hex socket extender of at least 12 inches long, as the rear nut of the engine mount is not accessible .
It should be a 30-60 minutes job if all the tools are in hand. The part is cheap and cost only USD $ 60.
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