Replacing serpintine belt but belt keeps slipping off and was told that the crank case pulley was needing to be replaced. Is this the actual problem or is there something else that could be causing the problem. I would appreciate some feedback. This is my sons car and he needs it for work. THANKS
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The cars today do not have belt adjustments they have what is caller a idler pulls that keeps a serpintine belt "all in one belt" that snakes around all the pulleys,thus the serpintine..name..anyway if it is slipping most likely the belt needs replacing or the idler itself is bad..neither can be adjusted..the fix is replacement...your car should have a belt route under the hood showing where it goes and the idler is spring loaded and easy easy to take the pressure off to take the old belt off and replace it..not a big job for garages if you wish not to DIY .good lucK
Sounds like the belt tightener unit is wore out and needs replacing.
As the bearings wear out the pulley will move around causing the belt to come off. When you replace the tightener you should replace the belt as well.
You may have a bad bearing or bushing in one of the idler pulleys, the belt tensioner, or the alternator. Normally the crankshaft pulley aligns unless somebody changed timing gears or the pulley itself and it's not all the way in.
Typically a belt will come off if all the pulleys are not perfectly aligned.
If you recently replaced a power steering pump and the pulley was not properly seated all the way down where the pulley front is flush with the metal shaft from the pump then you will shred the belts and they will come off. If you ONLY swapped the tensioner and idler pulley you may have installed the tensioner so it isn't parallel to the other pulleys but that would be very rare because it would have been difficult to get the belt on if it was not properly installed. There also could be a damaged plastic pulley that could be "cutting" into the belt which would also cause the belt to slip off.