Tools You'll Need:
* New alternator belt: Make sure you get the correct size and type. Your owner's manual or a parts store employee can help you with this.
* Socket wrench and sockets (if needed): Some Aleros may require loosening bolts to adjust tension or access the belt.
* Wrench(es): For loosening/tightening the alternator or tensioner. Sizes will vary.
* Gloves (optional): To protect your hands.
* Flashlight: To improve visibility.
* Repair manual (highly recommended): This will show you the exact belt routing and any specific instructions for your car.
Steps (General - Consult your repair manual for specifics):
1. Locate the Belt: Identify the alternator belt. It's the belt that runs around the alternator (usually a cylindrical component with a pulley) and other engine components like the crankshaft pulley and power steering pump.
2. Inspect the Old Belt: Before removing it, examine its condition. Cracks, fraying, or glazing are signs it needs replacement.
3. Loosen Tension: This is the most crucial step and the way it's done varies. There are several possibilities:
* Manual Tensioner: Some Aleros have a manual tensioner which you might need to use a wrench to loosen. This will create slack in the belt, allowing you to remove it. Consult your repair manual for its location and how to adjust it. Often it's a bolt that pivots a tensioner arm.
* Automatic Tensioner: Many modern cars have an automatic tensioner. These usually have a built-in spring mechanism. You might be able to use a wrench on a specific bolt to temporarily release tension on the automatic tensioner, or it may simply require manipulating a specific pulley to allow for slack. This usually is done by using a tool to leverage against the automatic tensioner, not simple wrenching.
* If uncertain about the tensioner: Do not force anything. Incorrectly attempting to remove a belt with tension can cause damage to the belt, tensioner or other components. Seek professional help.
4. Remove the Old Belt: Once there's enough slack, carefully work the old belt off the pulleys. Start with the loosest pulley and work your way around.
5. Inspect Pulleys: Check the pulleys for cracks, damage, or excessive wear.
6. Install the New Belt: Starting with the tightest pulley, carefully guide the new belt onto each pulley, following the exact routing of the old belt (crucial!). Again, your repair manual is your best friend here.
7. Tighten Tension: Once the belt is on all pulleys, restore the tensioner to its normal position, tightening any bolts you loosened. The belt should have a snug fit, but don't overtighten it. It should not be so tight that it squeals or whistles.
8. Check Tension: Manually check for belt deflection (how much the belt moves when pressed). The amount will vary, check your manual for the specifications.
9. Start the Engine: Start the engine briefly and check for squealing or slipping. If there is any noise, recheck the tension and belt routing.
Important Warnings:
* Safety First: Disconnect the negative battery terminal before starting any work.
* Consult Your Repair Manual: This guide provides general steps, but your car's specific belt routing and tensioning mechanism might differ. Use a repair manual specific to your 2002 Oldsmobile Alero.
* If Unsure: If you're uncomfortable performing this repair yourself, take your car to a qualified mechanic. Improperly installing the belt can cause damage to the alternator, engine, or other components.
By following these steps and referring to your repair manual, you should be able to replace your alternator belt successfully. Remember safety is paramount!
