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I had a knocking problem on my 300CD a few years back. It was in fact a bad rod bearing, as it ran perfect, but the oil smelled burnt. I replaced the engine, and soon after the sound came back. I thought I had another rod knock in the second engine. The difference was that it did not idle right this time. If I was a betting man, I would have put money on a bad rod, as it sounded identical. However, the oil was not burnt smelling, so I was hoping it was just injector nailing. A trip to the wrecking yard for a $25.00 set of injectors, and the sound went away! Wheeew, what a sigh of relief to only spend $25.00 and a few hours work and not have to replace another engine!
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