1985 Ford Bronco pulleys

1985 FORD BRONCO
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JEHUSAFAT
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Engine Mechanical problem
1985 Ford Bronco V8 Four Wheel Drive Automatic

i have a full size for bronco with a 302 it has the v-belt pulleys i am having trouble with the alternator to the crankshaft pulley belt. the pulley after tightened down begins to roll over and comes off once it comes off knocks off all other belts no matter what i do i cant fix the problem and have noticed that the pulleys are not aligned but cant fix. and my crank pulley actually moves forward when engine revs then aligns but belt still pops off
Apr 1, 2009 at 7:26 PM
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BLACKOP555
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the pulley moves towards the back of engine and front. or up towards hood then down towards floor?

you sure that both pulleys arnt popping off at the same time? how long belt stay on?
Apr 4, 2009 at 3:01 PM
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JEHUSAFAT
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hey the crank pulley moves toward radiator when engine revs up and it is only that pulley that moves and the belt rolls in the direction the pulley moves and pops off i am not sure if there is a special pulley or if the harmonic balancer or the pulley is bad.
Apr 5, 2009 at 3:38 PM
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BLACKOP555
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the crank may be worn. could have excessive axial thrust. causing it to pull forward. i would check to make sure the pulley is tight to the crankshaft. theres a large bolt in the center. then check the harmonic balancer and make sure its tight.
Apr 6, 2009 at 5:56 PM
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JEHUSAFAT
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would that also explain why the belt is angled and keeps popping off?
Apr 6, 2009 at 7:25 PM
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BLACKOP555
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if the balancer is loose or the main pulley is loose it can cause vibration and wrong angles causing the belt to pop off.

same if crankshaft is bad and is causing pulling and vibration.
Apr 6, 2009 at 8:57 PM
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JEHUSAFAT
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hey i have one last question if i cant fix it can i replace the vbelt system with a serpentine system off a 1987 ford bronco or is there special kits for this if so please let me know thanks for the info you have given so far
Apr 8, 2009 at 4:27 PM
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BLACKOP555
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i wouldnt suggest it. if the crankshaft is broken yopu need a new anyways.
Apr 8, 2009 at 9:03 PM
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JEHUSAFAT
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i had a chance to take a look at the crankshaft and it is fine the problem still is in just the pulleys so i was wanting to get rid of the vbelt and put on a serpentine system from an 87 or newer bronco if it will fit
Apr 8, 2009 at 10:16 PM
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BLACKOP555
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not worth the money for the parts needed. i would suggest just buying the pulleys needed and fix it.
Apr 10, 2009 at 8:52 AM