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Sounds like the idler pulley. It is what keeps tension on the surpentine belt. Usually a water pump will start dripping water through a small hole in pump that opens when the bearings go bad and start to wobble. You can spray some lube on idler pulley to see if it quiets it down some thou this is not a permanent fix. It will pinpoint the problem
Hello: Remove the serpentine belt, see if the waterpump pulley wobbles/makes noise when you spin it. If thats not it then start the engine, belt still off see if noise is there also while engine is running see if vthe crankshaft pulley wobbles. Also check the A/C compressor pulley (engine off, belt off) spin it by hand and check for noise and wobble. If all the previous is ok then it could be the balance shaft front bearing and or the timing chain.
There is quite an extensive service bulletin from Nissan regarding belt noise on this truck. It involves checking several things, two of which you have already replaced. The only remaining thing that appears to cause the problem is the one-way clutch that is mounted on the front of the alternator. Apparently they slip and cause this noise, and it sounds like this is your problem. They are a bit of a pain to change and probably expensive. Why they needed a one way clutch on the alternator, I'll never know, but that's the way it is.
Hello: That is not difficult to replace the pulley. If the pulley wobbles it is not the pulley.... The shaft bearing may be bad and that would make the pulley wobble. The pulley is held on with three bolts that have a 13mm head. If after removing the pulley you can move the shaft up and down you need a water pump.
your bearings. thats what it sounds like to me. if it almost sounds like you have a big rock just jumbling around in your tire thats most likely your bearings. its pricey but its worth it to get it fixed. if thats not it check into your transfer case and your shocks
the damper could be bad if it's the type with the rubber inbetween the pully and the the rest of the damper. check that and see if it is separated. if not looks like your crankshaft bearings could be bad