Volkswagen Jetta Water Pump Pulley

Is It Possible That A Loose Water Pump Or Power Steering Pulley Can Cause Rattling That Will Go With Rpms My Car Sounds Like A Deisel When...

How Do I Get At The Coolant Pump Pulley Bolts To Loosen Them? And Do I Have To Do That In Order To Remove The Timing Belt For A Head Gasket...