This post got me thinking. Tha last of the water damaged vehicles at my dealership finally got OK's from the insurance company to start repair work. It's a 2002 E320 with about 35K on the clock. When it came in several weeks ago (on a flat-bed) it didn't run, but it cranked over OK. We found the air filters and MAF sensor soaked. A compression test revealed cylinder #4 to be a little low, about 145 PSI vs. 175 PSI for the rest. The insurance company authorized removal of both cylinder heads to inspect for internal damage. The piston-to-deck height @ TDC was checked and found to be uniform across the board, however, the #4 piston appeared to be turned slightly clockwise when looking closely, straight down at it. I don't know if the compression was low before the water event, but I doubt it. We're going to recommend replacing all the rods and the #4 piston, but with insurance companies you never know. They may only want to replace the #4 rod or they may pay for a shortblock.