I own a 1979 Mercedes 240d with the om616 engine. I used to frequent the forum a while ago but wasn't too active with posts and replying. But now I need some help and advice. Here is the back story; driving the car at around 35mph, loud bang and engine shuts off. I pull to the side of the road and try to crank the engine three times but it doesn't start. I have the car towed home and do a visual inspection. There was a spot of oil on the inner fender well that looks like it came from under the valve cover with fairly high pressure but other than that everything looked intact. Upon removing the valve cover I find that the timing chain has broken in between the links and I can just pull it out. From there the car sat for 2 months until today when I removed the head. It looks like the valves contacted the piston on cylinder 2 and 4. No valves were bent and came out of the head just fine. The camshaft is toast as well as the rocker arms. With the head removed the crank spins freely and does not bind. Here is where I need the help. I need to know if the pistons can be reused or if I need to go through the whole block. I have attached pictures of where the valves contacted the block. Also, when looking at the cylinder walls the factory cross thatch pattern is still visible, only problem is on cylinder 2 there is a visible scratch on the cylinder wall. So what do you guys think, are the pistons okay to reuse as well as the block? What test can I do to provide peace of mind? If needed I can provide more pictures.

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