My neighbor has a Suburban and yesterday the pulley on his belt tensioner siezed and blew up. The auto parts store told him that the tensioner and pulley are preventative maintenance items that need to be changed.
Is the belt tensioner on a ranger the same way? Mine has 177K on it and I don't know if it has ever been changed. I am going to be driving a lot more next year and don't want it to blow up like my neighbor. Has anyone had a belt tensioner pulley sieze?