Peugeot 206 1.4 petrol rattling problem

I have been dealing with a rattling problem in my Peugeot 206 x-desing 1.4 gasoline vehicle for about 6 months. There is no problem with the car's traction or operation. There is no misfiring, but I hear a rattling noise when I step on the gas pedal or when the car is loaded while going uphill. Sometimes I also hear this noise when the car is first started. I have changed the catalytic converter, had the valves checked, had the oil serviced and all the heavy maintenance done, but the problem has not been resolved.

If there is a problem with the crankshaft, there may be a gap in the rod bearing or main bearing. I recommend removing the crankcase and having it checked.