Question about 2001 BMW 5 Series

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Tension pulley or alternator bearing making loud screech i need to slack belt to check bearings

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Take belt off check each pulley, and replace as needed 

Posted on Sep 13, 2009

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2 Answers

Screeching sound when cold not tha fan belt not the power steering belt not the top tensioner


It is possible you have a bad bearing in the alternator. They make an automotive stethoscope to listen for this, but sometimes you can get by using a screwdriver and pressing your ear against the handle while touching the tip to the body of the alternator. Be careful not to get the screwdriver into the alternator fan. You can generally hear a bad bearing. Perhaps a better check is to take the belt off the alternator and spin it by hand (when cold). If it turns rough, makes noise, or wobbles, the bearing is bad.

Mar 23, 2014 | 2006 Mahindra Scorpio 2.6

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02 Mitshu Lancer OZ screeching start up noise


Check the fan belt and re tension it as required.

Sep 09, 2017 | 2002 Mitsubishi Lancer OZ Rally

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My 92 chevy blazer is making a loud squealing noise sounds like my belts but its not that I've replaced the belt and the tensioner what else could it be?


Bearings in Alternator, water pump, power steering pump or even a squeal from Vacuum line, EGR diaphram or similar. Check power steering fluid level.



Now when you replaced the tensioner, did you notice more pulleys that were just "there" and not connected to anything? These are idler pulleys and are helpful in routing the belt. They have bearings too!

Pleae rate my info.

Nov 15, 2012 | Cars & Trucks

3 Answers

Why belt keeps shredding


usually due to a bad bearing, or from resistance due to a frozen or failing assemble, as in power steering, alternator, or an idler. The best way to determine is to remove the belt and check all pulleys for play and resistance.

Feb 10, 2011 | 2000 Chevrolet Venture

3 Answers

The belts continue to make a loud screeching noises when i drive over 55. Sometimes when the car is idling the belts make noise. Could it be the tension pulley.


it could be the tensioner, water pump, alternator, A/C compressor, power steering, or even a really bad serpentine belt. The only way to be sure is to remove the s-belt and spin-check the pulleys and listen for squeaks or grinding bearings.

Jan 13, 2011 | 1984 Buick LeSabre

3 Answers

My belt on a 1989 suburban is scretching. how do i tighten it?


The drive belt has an automatic tensioner pulley. It will be a pulley on it's own attached to an arm. It'll be the top left pulley under the drive belt if there are only 2 at the top, or it'll be on the top righton top of the drive belt if there are 3 or 4 pulleys across the top.

Check to make sure it is moving freely. You can do this by attaching a wrench to it and moving it down if it is under the belt, or up if it is ontop of the belt. It should require a bit of force. If it doesn't move or is easy to move then it needs to be replaced. If it feels like it's moving freely and the spring seems strong then your belt is stretched past it's limit and needs to be replaced.

Alternatively it may be screeching due to a pulley seizing up. Check to make sure things like the idler pulleys or the A/C and Alternator pulleys move freely.

Jan 06, 2011 | 1989 Chevrolet Suburban

1 Answer

My serpintine belt started making a loud screeching noise, and eventually slipped off. I got it put back on but its still making a screeching noise. All of this started after i got the AC compressor fixed....


One of the belt pulleys likely has a bad bearing. watch the pulleys for binding while it's running or remove the belt and check each pulley by hand. AC puts more strain on the belt...if the belt is not new and pulleys check out, (and tensioner is working properly) change the belt.

Jun 07, 2009 | 1997 Pontiac Bonneville

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