I have a 1991 22re that squeals starting at 3500 rpms. Also from time to time I have a belt squeal but the squealing I'm talking about is very metallic sounding like it might be some sort of baring. This sounds a lot higher pitched then a belt. What could it be?

 

a bearing maybe..lol maybe you overtightened one of the belts causing stress on the pulley making it go bad. Im not sure but just a thought.

 

I haven't made any belt adjustments but I guess it could be. Any other ideas?

 

im guessing it only started happening after the belts were exposed to rain/water? If your belts are in good condition (ie. no cracks or glazing), i would recommend loosening the tension and retension the drive belts. if the belts are worn, you should consider replacing them

 

May also be the bearing the cam belt runs on that the outlet water run to the rad. through.
Bigblock

 

besides the belts...
if the truck has air conditioning, could be the clutch
could be the water pump, or power steering pump or alt. bearings

 

Interesting, I have the same condition in my 93 4x4 Pickup starting from about the same RPM. It happens most often in first gear (usually trying to pick up speed too fast off the line) and sometimes even in second. My first thought had always been my belt, but the belt is in great shape. And doesn't seem too tight. The truck has done this since I bought it almost two years ago, so I took it as a fact of life.

When I have a moment, I'll try loosening and tightening the belt and re-post with any useful info.

Another post thought I thought I'd add - perhaps I'll try the RPM's with and without it in gear isolate which bearings/belt etc. it could be. Perhaps this could help you as well. If a friend can rev in the driveway you could isolate it by sound with your ear under the hood, and adjust from there.

 

Now the squeeling is starting at lower and lower rpms. It now starts at 3 grand not 3.5 grand so it must be getting worse. Must be a bearing, which ones could it be?

 

try taking the belt off and rev it up and see if it squeals and spin each accessory by hand and see if you find anything outta the norm

 

I have the same problem, but from idle. Buddies told me something with the fans start squeeling over time. Mine is a high pitched annoying sound.

 

Im going through the same thing right now on my 86 4Runner, but on my truck the squeeling starts as soon as you start it, ive ruled out the power steering pump and there is no belt on the a/c compressor right now, so the only thing left is the water pump, so im going to replace the water pump and timming chain because i don`t know if its ever been done.

 

ck the idler pulley. i had a belt squeeling and thought it was the pwr steering so i took the belt off, after a couple of days of armstrong steering i put the belt back on hoping for a miracle. started it up and no miracle so i took the belt back off and noticed the idler pulley was smoking hot after only a couple seconds. a.z. had a replacement bearing for inside the pulley. no more probs

 

just turn the radio up, and the squeeling goes away

 

I did check the idler pulley when i checked the power steering pump, so its not that either.

 

a fairly easy and somewhat accurate way to check the tension on the belts is to grab the belt in the middle of the longest side and with 2 fingers, try to twist it. If you can twist it more than ~1/4 turn, the belt needs more tension. Also, once a belt starts slipping, the surface that mates with the pulleys can overheat and 'smooth' out (a.k.a. "glaze") and this will amplify, or make worse, the slippage.

If you're brave, and the engine makes the sqealing if you rev it up even when the truck is not moving, very carefully spray some wd40, liquid wrench or similar precisely in the groove of a pulley, preferably where the belt is going into the pulley in order to minimize throwing off the lube. If it's squealing and doing what I said makes the squeal go away, you've found the belt with the problem.

If that doesn't solve the problem, other things may be suspect like I mentioned above: https://www.yotatech.com/forums/f116.../#post50960388 ... could also be the fan clutch, now that I think about it.

I didn't see mention of auto or manual, and it is possible to get some squeal / high-pitched grinding noise out of the torque converter or clutch release (throw-out) bearing in some circumstances.

 

Ive never heard of a fan clutch squeeling before, is that really possible ?.

 

My fan is belt driven and is always on. Is that abnormal?

 

Check the idler pulleys on the power steering and/or A/C belts, those are the likely causes of the noise. How to test? Release the tension on the belt and remove it. Spin the idler by hand and feel for looseness, grittiness or binding as the pulley rolls. If you can't tell the condition, try running the engine without that belt and see if the noise remains or not. Bearings are easy to remove and clean/re-grease and/or replace as needed.

Check your fan clutch:
- http://www.barneymc.com/TOY_ROOT/TECHNEEK/fan_clch.htm

 

Mine did that too for a bit. I loosened all the belts, re-tensioned them, and the noise went away.

 

One more thing, it only does it when its warmed up.