Tools You'll Likely Need:
* Pulley Puller: This is the most crucial tool. You'll need a puller that's the right size and type for your pulley. There are several types, including:
* Three-jaw puller: This is a common and versatile type.
* Two-jaw puller: Sometimes necessary for pulleys with specific features.
* Socket Wrench (or Wrench): To loosen the pulley nut (if there is one). The size will depend on your pump.
* Penetrating Oil (like PB Blaster): Apply this to the pulley shaft to help break free any rust or corrosion. Allow ample time for it to penetrate.
* Hammer (optional): Sometimes a gentle tap with a hammer on the puller can help break the pulley loose. Use caution to avoid damaging the pump.
* Gloves and Safety Glasses: Essential for protecting yourself.
Steps:
1. Disconnect the Battery: This is crucial to prevent accidental shorts.
2. Remove the Belt: Carefully remove the serpentine belt or any belts routed through the pulley.
3. Loosen the Pulley Nut (if applicable): Some pulleys are held on by a nut. Use the appropriate socket wrench to loosen and remove this nut. If the nut is stubborn, use penetrating oil and a breaker bar if necessary.
4. Apply Penetrating Oil: Generously spray penetrating oil on the shaft where the pulley sits. Let it sit for at least 15-30 minutes, or even longer if necessary.
5. Position the Pulley Puller: Carefully position the pulley puller onto the pulley. Make sure the jaws of the puller are evenly seated on the pulley.
6. Tighten the Pulley Puller: Slowly and steadily tighten the puller's center bolt. This will put pressure on the pulley, causing it to separate from the shaft. Do this gradually to avoid damaging the pump or pulley.
7. Remove the Pulley: Once the pulley is loose, carefully remove it from the shaft.
Important Considerations:
* Pulley Type: The method may vary slightly depending on the pulley design (e.g., whether it's pressed on, keyed, or bolted).
* Shaft Damage: Be extremely careful not to damage the power steering pump shaft during the removal process. A damaged shaft could lead to pump failure.
* If you're uncomfortable: If you're not mechanically inclined or lack the proper tools, it's best to take your vehicle to a qualified mechanic. Improper removal could cause significant damage.
Remember to consult a repair manual specific to your 1990 Buick Riviera. A Haynes or Chilton manual will provide detailed diagrams and instructions for your vehicle. This will show you the exact location of the pulley and any special considerations for your particular power steering pump.
