Need help. I have MAC pulleys installed for a few years now. Recently after having a rebuilt engine installed, started hearing loud squeaking noise come from the water pump pulley. Installed a new belt, but noise still there. Took off pulley and turned waterpump, but no noise. only comes from pulley when everything is hooked up. Pulley has some rust now from over the years. Could that be the problem? Very annoying loud noise. Is there anything short of getting new pulleys that can cure this?