I've had my yj for 2 years now.. and its been a downhill battle. had to replace engine, tranny.. and lots more. the list goes on. i dont mind though cause i love my jeep.
Recently there has been a squeaky noise. I can spray belt spray but it starts again after about 5 minutes. It seemed that i was loosing a little bit of coolant and my neighbor told me to check the water pump. so last night in 20 degree weather, lol, i changed the water pump and got everything put back on. I started and there was no squeaky noise for about 30 seconds. Now i dont know what to do next. i have loosened and tighten the belts. replaced the belts. and it just wont go away. I can't stand to drive it.
Did you change the belt at the same time? You would need to.
Also, getting anti freeze on the pulleys will make the belt slip. I always spray brake cleaner on the pulleys to clean them just before installing the new belt. This is assuming you have a serpentine/single belt
wherever you go there you are..........
If all of your pullies look good with none out of round, and your belts are good as you have replaced them, and you have tighted the belts like you said, I would check your alternator. Remove it's belt and spin it by hand to see if you feel the bearings grinding or binding. Just my thoughts.
2004 RED TJ Rubicon
Member of the Gear Grinders 4WD Club
I have just started having this issue as well, when it's cold the squeal varies by rpm, as it warms up it goes away. I'm thinking the idler pulley bearing might be going. Going to try and check it today.
Well I took the idler pulley (to the right of alternator pulley) off and no aparent squeal. Will leave it off for a few days and see if it's gone for good. It hardly puts any tension on the belt, so I will have to decide if I want to put a new one on or run it without.
I know its the belt that drives the alternator. I will take the belt off and turn the alternator by hand tomorrow morning and see if i hear any grinding.. another question, Does it take time for the belts to break in?
If you can safely do so, use a large screwdriver or other long metal pipe and place it on a bracket near the suspected pulley. Hold the other end to your ear. Should help magnify the noise and pinpoint the problem. I used this method to diagnose a bad idler pulley a few days ago.
Just make sure you stay away from any moving parts while doing this. Belts, pulleys, fan, etc.
i had the same problem, i tried everything and belt dressing only made it worse. out of frustration and a last ditch attempt to make the squeal stop i sprayed a small shot of silicone lube on the belt while it was running and to my amazement my squeal is a thing of the past.