I replaced the belt without removing the fan on a 603 engine. It is not that hard (30 minute ?) but you have to move the belt and tensioner around to try to put the belt in place. You may need to go under the car to slip the belt thru tight spaces. The MB tire iron bar is just the right size to insert into the lever for loading/unloading the tension. There is no need to go to Home Depot for the tool.