Belt Tensioner on ISL

[Larry Geese]

The surpentine belt tensioner "jumps during low speed idle" Just a slight increase in RPM it smooths out. Is this a problem? ISL 2005 Coach has 31K miles.
It this a 'pita" to replace? Can I do something like lube or ??
Thanks
Larry

[Downsizer]

Typically, they will jump a little at idle since there is no real "load" on the tensioner. It isn't throwing the belt, is it?? Never seen one you can lube.. usually all sealed bearings.....The tensioner is usually pretty easy to change... hard part is having enough room/leverage to get the tensioner all the way in so you can reinstall the belt!!!

[Mike Canter]

If you take the belt off then spin the tensioner pulley with your hand and it is not rough and does not make a noise and doesn't wiggle when you grab it and try and move it then it is most likely OK. Check the belt real carefully for fraying and dirt. If the belt looks OK and not too many cracks then I would not worry about it. There is nothing to lube.