I have three 617 turbo engines in my family's fleet. Invariably, when I have to replace the motor mounts, the right one is the more worn - usually collapsed so the engine support arm makes contact with the metal shell of the motor mount. I keep the engines clean so there is no oil deterioration of the mounts - they just gradually compress over time.

I have always used 123 241 13 30 for both mounts. That's the number that is shown on most web sites as the correct part number for both mounts.

Today, I looked into the MB Factory service manual for the OM617 Engine. It shows a 123 241 27 30 (one blue dot) for the right mount and 123 241 40 13 (two blue dots) for the left mount.

Does anyone know the difference between these two motor mounts? Since I have been having trouble with the right motor mount, should I use a 123 241 27 13 in that application?

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Tom Evans
69 280SE 91K (wish I still had it)
73 220D 98K
78 300D 134K
78 300D 185K
81 300SD 301K (still have)
82 300SD 321K (still have)
84 300D 268K
84 6.2 Diesel GMC Suburban 225K (a whole different story!)