It can be done with everything in place. Remove the fan shroud and then put a socket on the bolt in the middle of the tensioner pulley to rotate the pulley inwards then take the belt off it. Remove the belt and put a new one on using the same method. Make sure you route it right.

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Ali Al-Chalabi

2001 CLK55
1999 Dodge Ram 2500 Cummins Diesel
2002 Harley-Davidson Fatboy
Merlin Extralight w/ Campy Record