Hello all, Ive recently started to hear a knocking noise a few minutes after starting from cold that I think also is causing a whistling noise when driving. I removed the wheel arch cover today and stuck my head in trying to find this noise and it seems to be the crank pulley. How easy a job is it to do,,home or garage? Im hoping to do it myself to eliminate this before I start looking at the p/s pump or alternator. Will I need stretch belt kits and pulley pullers etc? Thanks for any help.