The drive pully has groves that the belt is suposed to fit in and has more groves than the belt so that the belt can be moved in order to line up the belt into the center of the drum pully.
However the belt will not ride on the drum pully even when placed to the furthest outside groves.
If I place the belt on the furthest outside groves the belt wears against the back of the machine and comes off.
And if I place the belt outside the groves it throws the belt off during the spin cycle
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double check that you are going around the correct side of each pully,
rule of thumb the belt has a front "grooved" side and a back "flat" side the pullys will be set up the same, (flat with flat, groved with grooved)
Start by drawing a diagram of the belt routing. Serpentine belts normaly have 1 spring loaded tensioner (1 pully will have a nut or 3/8 or 1/2 inch drive hole) That will be the tensioner. get spanner or ratchet to fit & lever the tensioner away from the belt. Remove belt. fit new belt to most pullys except the easiest to get to, lever the tenioner back & fit the belt to the last pully, Check the belt is on all pullys properly & your done
you have all 7 marks lined up? there are the top two pullys that need to be lined with the top marks on the rear timing covers, and then there are two marks on the bottom of those pullys that need to be lined with the marks on the two bottom pullys, as well as the two side marks on the bottom pullys that need lined on the belt, and then the mark on the crak pully that needs lined up with the mark on the oil pump?
if you look at the engine youll see the alternator directly above the alternator you will see a pully which doesnt have grooves on the surface like the rest of the pullys. this smooth pully is the tensioner pully and you will need to use a large ratchet or spanner to to lift up the pully (its on a spring) so you can fit the belt.
shiney pullys indicate that they sit or rest on the outside of the belt.
if you have a serpintine (belt with groves on the side that rides on pullys) if ther are cracks on the groves it needs to replaced if the groovesn are just clogged and dirty take it off and cleane it with soap and water and old toothbrush
These belts are really sensitive. Try messing around with it. Making srue that the belt isnt coming off the big tub pully. You tub pully isnt loose is it. Make sure the bolt that hold the pully onto the tub is tight on. Make sure the pully isnt loose. Inspect it for any small craks where that boltt tightens up. If the pully check out ok. Check the small motor pully as well. Make sure that isnt loose or anything. Pull on it if if its loose then thats you problem.. Inspect both pullys good. I would assume belt is in good shape right? If both pullys check out ok, then i would try to get the belt on and just mess around with it, spin the pully and if you se the belt starting to slip off adjust it as you keep spinning the pully....hope this helps
the pullys with the groves need the ribbed side of the belt. and the pullys with the flat serfice need the back side of the belt. if u try it a few difrent ways u should be able to put it on in a few minuts
this is hard to exsplain without showing you a photo ,but i will try. first get the belt around the engine crankshaft which is the pully closest to the bottom and center of the engine. when standing in front of engine start to lead the belt to the right and connect to power steering pump then up to generator, next thare is going to be a smooth pully not groved like the others to the left,put the smooth side of the belt on bottom of this pully and continue left to the ac/compressor go around ac/compressor andstraight down to the belt tensioner , and then right over to the water pump which has a smooth pully not grooved. remember the smooth pullys will always carry the smooth side of the belt and the grooved pullys the grooved side of belt. the belt tensioner will half to be released by a serpantine belt tensioner tool sold at your local auto parts store. these instructions is for 3.8 liter engine, if you have a 4.6 liter engine it will be different, so repost stating that you have a 4.6 if this dont help