There is a loud noise coming from my 2000 Jeep cherokee 4.0 engine. Seems to be coming from the A/C unit and the pulley attached to the unit. Found shavings around and near pulley. Pulley has ceized once. Not sure if the whole unit should be replaced or just the pulley and bearing. Is this a job for the shop or could i figure it out and do it a t home?
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If the noise still sounds like it's on top, I'd remove the valve covers and check the rocker arms to make sure they aren't broken or worn. Also crank the engine over and observe how far each travels. If any are different, a lifter or lifter and cam have gone bad. If your oil pressure is low or the noise is deep inside the engine, likely you have a crank bearing problem. In most cases it's more economical to get a scrapyard replacement rather than do a rebuild. Before doing anything like that, have an experienced tech listen to it. Only other thing that can make a noise like that is a broken flywheel. A good tech can tell the difference between noises and give you better advice than I can because he can hear it.
Is it when the engine first starts? It sounds like to me that the starter is getting stuck in the fly wheel. what happens is when you go to start it, the solenoid push's the gear out and spins the gear almost one full action, the grinding noise could be the starter staying engaged after the motor has starter but quickly comes out of it after driving out of it. just a thought.
One of your pulleys is seizing. Most likely the a/c compressor or the tensioner (idler pulley).
Use a helper.... turn OFF a/c and have someone start the car. Observe the pulleys and see if the center one quits turning or is the source of the noise.
If can't determine and no noise, turn ON A/C and observe.
You will find it, but stay out of the line-of-fire if the belt breaks... it will be slingshot out of the engine compartment!!
Try removing the belt and turning each pulley by hand. If everything is smooth and free, with the belt still off, drive down the block once and see if the noise is there (this will eliminate all rotating accessories on the front). If you hear the noise, then there is a problem deeper inside. Oil pressure is good? Dont' forget when doing this, you will have no power steering, so be careful.
it sounds like the bearing is going bad in the pulley through chrysler i believe you have to replace the whole unit. to do this you will need to recover the freon from the system which makes it hard to do at home
if the compressor is not dammaged you can just replace the whole clutch assembly which comes with the a/c clutch coil, and bearings and the clutch plate i would suggest you to seek proffessional help on this one cause it needs special tools and equipment because of freon or r134 in the system!!!!