CRD 3.0 V6 Mercedes Benz Motor

I have a problem, overturn the cooling water in a few km as if it were the blown joint, it raises pressure without heating and throwing the water gradually, I would like to know if it happened to someone or know it is a general problem. Or I simply play to see where I begin to disarm since I have two cylinder covers, since it was never disarmed and has 100000km, any information that can give me will be very helpful thank you very much