871 Ac belt tensioner removal

[Waterloo]

If it is the little pulley/tensioner up top by the head and AC, you only need to remove the pulley. Gates makes a replacement for half the cost of Cummins, any good big truck parts store will carry it, FleetPride, NAPA, etc.

Use a good 6 point socket and gently work it back and forth, it should come loose. If it is that pulley I am thinking of, and not one of the lower big ones for the serpentine belt, the bearing in the pulley normally lasts a couple of years and then fails. Gates sells the entire pulley with the new bearing.