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Belt and idler pulley replacement 2005 Chevy 2500hd 6.6 Duramax

Replacing idler pulley and belt on 2005 Chevy 2500hd 6.6 Duramax

Chevy 8.1 with bad idler pulley.

Our 2001 Chevy 2500HD had it's belt tensioner go bad. I replaced the tensioner, but didn't change the idler pulley. This is the result ...