2006 Chrysler 300 water damage

I'm really not sure if I can help you, but here goes...

First of all, who is "claiming" these things that your are referring to??? And did you recently have work done to your car???

Next, water can't crack an engine block. And what do you mean "Small engine block"??? You only have one engine block in your car. Also, you don't have "Piston rods". You have pistons that are connected to rods that are both connected to a crankshaft. And if your block is cracked, then something had to crack it. But either way, whatever cracked it (whether it was a piston or a rod), your block is no good anymore and you'll need another engine.

Finally, if someone did work on your motor and either caused the damage or didn't properly fix damage, then you need to take your car back to them and demand that the fix it right or refund your money.

if piston rod number 6 is bent can this cause a crack in cylinder number 2

If any "connecting rod" is bent, there's no telling what kind of damage will occure or where that damage will show up.

A bent "connecting rod" will place a lot of stress on that piston, cylinder, rod bearing and main bearing. And when your crankshaft is spinning at a few thousand r.p.m.s, something inside of your engine will let go, and who knows what happens next.

Sometimes a rod will fly out of the side of the block traveling at several hundred feet per socond. Or the rod will snap in half and the crankshaft will fling it around the insides of the block until the motor self-destructs.

So "maybe" your bent "piston rod" caused a crack to appear inside of cylinder no.2.