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Old 11-12-2019, 10:02 PM
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Exclamation XJ/YJ belt Issue

Hello friends!

I own both a 96 XJ and a 95 YJ, Both use the same power train so id figure id ask you great people.

My YJ has a belt/pulley issue where it will squeal then stop. the pulley is going bad because i can hear it after the belt gets done.

95 YJ: 2.5L 4 cylinder, 5 speed 4wd

could this be the cause of the power loss i am having? It starts and drives fine after running for a bit, but today i noticed a power drop on my charging gauge while it was squealing then back to "normal" -on the edge of the red zone. all the belts are in good shape but the pulley issue is my main concern. could this pulley be binding the belt and that cause the alternator to not charge? or could this be a different issue all together? and my stick likes to shake a little to much while all this is happening. i really hope its a pulley

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Old 11-12-2019, 10:26 PM   #2
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belt might not be tight enough.

If you decide to replace the pulley do not go to the parts store and order one. Parts store pulleys are $20 and made in China and will not last very long. You can tap the bad bearing out of the factory pulley and tap a new quality one in. You can get a quality made in German/USA/Japan bearing that will last 20 years for about $5 shipped to your house off ebay. I dont have the part number for the bearing handy but i could dig it up if your interested in buying one.

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Old 11-12-2019, 10:48 PM
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I will have to check it again but i think its tight. With winter coming and this being my DD my main concern is the power drop. while my engine is running i can see the power at normal. then the squeal. then i see the power start to fall. squeal stops. power back to normal.

after all the noises stop from the engine bay, the transmission likes to act normal and drive very well... so this leads me to conclude that it is something to do in that area and not the transmission... Or maybe its 2 different things all together. Idk.
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Old 11-12-2019, 11:03 PM   #4
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About 99% sure its a 6203RS bearing. I just ordered a couple myself. Pull one of the idlers and the number is on the bearing. Regarding the squeal. Here's another way to possibly look at whats going on. Directly after starting a vehicle with a loose belt its not uncommon to hear a belt squeal if the alternator belt is loose or got wet from a rain storm. This is from the starter draining the battery a bit, and the alternator doing its job recharging it. This recharging the battery also loads the alternator which makes turning resistance,which makes that belt slip. Enough to make you feel a power drop? Cant say Ive ever noticed that one in any of our vehicles. Maybe like turning on the A/C, but thats it. You say your volt gauge dropped into the red after you had been driving it for a while, then back to normal. If everything is good, normal etc that sounds like a problem is brewing obviously. Your alt is working double duty to get the battery back up to snuff for some reason. Somethings putting a drain on the charging system such as a big stereo amp?, a short it sounds like Again, somethings questionable if its happening out of the blue long after its been started and driven a while. IMO factory gauges are ehh for accuracy. Get a Digital Volt meter and see if you can duplicate the issue with the multi meter hooked up and see what battery voltage drops to. That would tell you a lot to see whats up. Your battery voltage while running should be around 13.8 to 14.3 volts.
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Old 11-12-2019, 11:21 PM   #5
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Old 11-12-2019, 11:29 PM
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might be loose. ill make sure to check it. well the jeep acted like it was on battery power with no alternator charge. then it came back on. it was a new alternator when i got the jeep so that's why, with the squeal, i believe it has to do with the belt or a pulley. I have been meaning to check the voltage anyways because it usually runs high, about 16/17, according to the factory gauge.
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Old 11-13-2019, 12:32 AM   #7
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Welcome to the Forum Zusez3,

I suspect the alternator. Was it installed by the PO or did you install it yourself when you first got the Jeep? Do you know if it was a new MOPAR alternator or a new aftermarket alternator? Or, was it a re-manufactured or used alternator.
If it was anything other than a new MOPAR alternator that's the first place I'd start checking. The 16/17 volts is a big clue. Check the voltage with a multi-meter.

Let us know what you discover.

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Old 11-13-2019, 10:16 AM   #8
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16+ volts is not good for your computer or anything else. You say new alt? Id suspect its defective. You really need to verify with a good meter what your getting before frying some electrics. There's lots of junky parts out there so it would be no surprise if the new alt is bad.
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Old 11-13-2019, 11:05 AM   #9
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Might try physically cleaning the battery and all 3 ground connections bright shiny clean make sure they are good and tight. Like others have said get a multimeter to check the voltage at the battery when the Jeep is running. Don't trust the volt gauge on the dash until you confirmed the reading with a multimeter.
Then try tightening your belt but don't over tighten it, get a mechanics stethoscope carefully listen to the pulleys and idlers with the Jeep running and squealing. If it is hitting 16+ volts it could be a sign of a bad battery.
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Old 11-13-2019, 11:58 AM
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Ok friends!

I took the YJ to advance for a full electrical test.

Battery reported 444 CCA while its rated for 600CCA - Low but ok for now
Starter checked out ok. 10.61v for 1.10 seconds
charging system reported 14.88v under no load and 14.84v under full load

While this was going on i noticed the power drop again on my gauge but the test did not notice a drop. the gauge must be acting up or the alternator is about to go out and did not show any signs this time...
so this leads me to the conclusion that everything is ok on that end of the stick... now its just a belt or pulley issue.

Thanks to everyone who gave good information and part numbers!

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