Hello,

After replacing the timing belt, the new serpentine belt slips off of the largest pulley, which also holds the p/s belt. It slips to the center of the engine. I have tried resetting it and increasing tension on the alternator, which holds the belt in place, but after a while it just slips again. In this engine the alternator moves front and back to create tension, btw. In case it helps, after the belt slips, the alternator has not moved. The edge of the belt has become weak and bends on the side that kept slipping, so I turned the belt around left to right, but it continues to slip. I know the belt needs to be replaced now, and I will do it, but the same thing will happen. Does anyone know what can solve this problem? Is it pulley-related? 2.4 Liter 4cyl

 

The serpentine belt should never slip off a grooved pulley. Be absolutely sure you have the correct length belt, that the pulleys are clean and not oily or greasy or crudded up with little globs of melted belt.

Make sure you have it routed properly as per the diagram that is on a label somewhere in the engine compartment. These things vary greatly by model and year, so if they sold you a belt that is a little too long, it won't work right.

Eyeball the pulleys for the serpentine belt. They must all be in the same plane.

 

The pulley appears to be clean. i checked and rechecked the routing several times while installing it. i will verify the part number for the belt. i think this pulley may be misaligned, now that i think about it, when the car first starts there is squeaking and the wheel is hard to turn. that pulley also holds the p/s belt, so maybe the two are related.although that belt never slips. thanks for help.