Timing chaim on MB 300E

Hi you guys there,

I have Mercedes Benz 300e 86, over 200k miles, still runs good. I am concerned whether previous owner replaced timing chain or not because of car's age. I have tried to look into the engine to find where that chain is located but couldnt see anything except a belt behind the fan. Can someone tell me how much i should expect it to cost to be replaced. If it breaks, how much damage may i have on the engine. Also what is the sign of worn timing chain?. I am asking this because sometimes when i start my car in the morning i hear some sound like tak tak tak,it lasts for around 10 seconds and then everything is ok. Also oil pressure goes up to 3, so that is ok.
Thanks Alex