So I'm getting a whining noise that gets louder as I build up the rpm's. I've read other people have had the same problem after going through water or mud. I'd rather fix it myself than be without transportation for a few days while my jeep sits at a dealership but I have no clue how to replace the tensioner pulley. I haven't been able to find much "how to" info on the 3.6 so I'm hoping someone can help me out or give me some insight. Any help is very appreciated, I'm still pretty new to the jeep world. It seems like every time I play in the mud I regret it but I keep going back...
If it is a pulley or other bearing it is to track down. Get a mechanics stethoscope for $10 or less from Harbor Freight or Autozone and place the the rod sensor on each pulley on the belt. You hear a distinct grinding noise instead of smooth sanding like noise.
"A man has got to know his limitations."
Yes, there are 2 black plastic Idle pulleys. You need to replace both of them. Unbolt both pulleys, one bolt each and replace... Then use a torque wrench on the tensioner to get the belt back on. It's a 20 min job.
I had to replace both of mine at 9k miles. It was from playing in the mud. I kept driving with it whining and then burnt up and the belt came off while driving. So I had to replace my on the side of the road.
Check the vendor here, moparonlineparts. They should have them. Note, order 2 of the single pulleys. The tensioner is replaced as a complete unit. The pulley is the same as the one mounted on the top right.