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My first 'Benz had that same sound. I drove it till it made so much noise, that I knew it was done. I doubt yours will throw a rod through the block. The engine would have to be turning high RPM's for that to happen. The clearance between the top of the piston and the head is so small, that a little slop in the con rod bearing will cause the piston to hit the head. When you pull it apart, you will probably see evidence of that. I'd say put another engine in it if you need a car, and maybe the noisy engine can be repaired (done it before). The #2 rod bearing (barely accessible without removing the upper pan) was bad, so I sanded down (on a piece of sandpaper glued to a piece of granite) the mating surface of the rod cap, and used plasti-gauge to know the clearance. A couple times of sanding, and I got it within spec. A new bearing, and the engine was good to go. If the crank is too far gone, there is no way to repair it without removing and disassembling the engine.....Rich
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