Pcv was changed 3 months ago and cannot see any holes or splits in any of the piping. How does one check the crank shaft pulley

Hi all I'm Terry andnew to this group. I have a freelander 1 td4 which when I reach about 80 kph I hear a chain like noise and then I see black smoke at the back When it's cold it drives fine but as soon as it gets hot it's starts giving this problem. Over 80 kmph the noise is almost continuous...

Hi all I'm Terry andnew to this group. I have a freelander 1 td4 which when I reach about 80 kph I hear a chain like noise and then I see black smoke at the back When it's cold it drives fine but as soon as it gets hot it's starts giving this problem. Over 80 kmph the noise is almost continuous...