Crankshaft pulley (vibration damper) moved forward.
My son was driving my 1993 Jeep Grand Cherokee this morning and the serpentine belt came off. I installed a new belt and it came off immediately when the engine started. I took a closer look and discovered the crankshaft pulley was forward of the other pulleys and idlers by about 3/4" and actually touched the fan. I removed the fan. I turned the engine over with a 3/4" socket and breaker bar. The bolt on the crankshaft pulley is not loose. The engine turns over by hand easily. What could cause the crankshaft pulley to move forward? Could the crankshaft be broken?
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You have an out of alignment belt run across the pulleys of the engine, this causes the belt to make noise as it rubs on the edge. Many times this is causes by the crankshaft vibration damper coming part and the pulley walking outward.
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Place a small amount of grease on the damper shaft to ease installation. Align the key slot of the damper with the key in the crankshaft and push damper on. The damper bolt is tightened to 80 ft. lbs. (108 Nm), except on 5.2L and 5.9L engines. On 5.2L and 5.9L engines, tighten to 135 ft. lbs. (183 Nm).
Install pulley and tighten bolts to 20 ft. lbs. (27 Nm).
Install drive belt and adjust to the specified tension.
does it have a serpentine belt?,check tensioner pully. I just fixed this on my son's car. I shut engine off making sure to not get any on belt or pully contack surface,i sprayed licquid wrench on it where the berrings should be,it quited right down,may need new one anyhow but that is what it was. I found it using a lenth of garden hose held up to my ear, be carefull of moving parts!
It sounds like a loose serpentine belt. Check the belt for cracking or frayed edges. It may need to be replaced or simply tightened.
If the sound is minimal or gone when the engine is idling, and you hear it whine when you step on the gas, then the belt is probably your issue.