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Check the belt alignment with the rest of the pulleys and idlers and if ok remove the belt and spin the alternator and power steering along with any other pulley to see if you can find the squeal. I hope this helps. Take care.
Make sure its simply not the A/C tensioner thats gone bad. You might just have to replace that one. There's absolutely no reason a belt should be the culprit unless it is tearing or ripped so you can look for wear and tear on the belts. Most likely a pulley is out of alignment or the pulley bearing is just starting to squeal when it gets wet. But it can still squeal if its dry outside.
Take the belt off and spin it with your hand, if it squeaks, its bad. I had to replace one years ago, they just go bad. Make sure the A/C compressor isn't whats squealing too, and the other top pulleys too. Sometimes you can be fooled on where the squeal is really coming from. Spin everything that can be spun, by hand.
the squeel is most likely the pulleys are contaminated with old rubber from the old belts or that you have a dry alternator bearing,if you try running the engine without the belt you will locate the problem easier.
the timing belt should be changed every 60k or 5 years whichever soonest...
try checking the belts adjustment first, adjust it if its loose, check the the belt width against your pulley , it could be that belt is wide enough thats why itshitting the pulley thats why it squecks, get a candle and slide it on your belts edge just enough to lubricate them, run the engine and check....
You didn't mention the alternator, power steering pump, or water pump. In fact, any pulley other than the crankshaft one can have a bad bearing or dry seal. Remove the belt and spin each pulley while listening for any rough noise or squeal. If it was the crankshaft, it might be time to check the oil. Start the engine with the belt off to see if it does squeal. Make sure the noise isn't coming from the radiator fan(s).
yeh, mine did the same thing with a hydralic belt. it was the bearings. mazda capellas use a lot of 6202 bearings which, luckily, are fairly cheap, and are commonly used in pool pumps. so you can find them at pool pump repair stores. although pool pumps use 6202 2RSR bearings. these are just the water proof type, but are excactly the same size and can be used.
to test if it is a bearing problem, remove the belt and try to twist the individual wheels by hand, you should be able to turn the 2 smaller ones.
from memory the alternator belt is in a fairly in accessable postition so the belt is going to be hard to put back on.try other things first, like wiping the inner side of the belt with a dry cloth to remove moisture.
worst case senario is your alternator has, or is starting to, seize up and you need to replace it.
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