Tools You'll Likely Need:
* Wrench Set: Metric sockets and wrenches, including a socket for the pump pulley nut (likely a large one). Ratcheting wrenches will make the job easier.
* Power Steering Fluid Catch Pan: To collect the fluid that will drain out.
* Jack and Jack Stands: To safely support the vehicle.
* Wheel Chocks: For added safety.
* Socket Extensions and Universal Joints: For better access to hard-to-reach bolts.
* Wrench for the Pressure Line fitting: This is often a flare-nut wrench, and you might need a line wrench.
* Torque Wrench: Crucial for tightening bolts to the proper specification.
* Gloves: To protect your hands from power steering fluid.
* Shop Towels or Rags: For cleaning up spills.
* Pry Bar (possibly): Might be needed to help break loose stubborn connections.
Procedure (General Steps – Consult your repair manual for specifics!):
1. Safety First: Disconnect the negative battery terminal. Support the vehicle securely on jack stands. Engage the parking brake and use wheel chocks.
2. Drain Power Steering Fluid: Locate the power steering fluid reservoir. Carefully remove the cap and drain the fluid into your catch pan.
3. Disconnect Power Steering Lines:
* Pressure Line: This line is usually under pressure. Locate the fitting connecting the pressure line to the pump. Loosen this fitting slowly to release pressure. You may need a special flare-nut wrench to avoid damaging the fitting. Have your catch pan ready to collect any remaining fluid.
* Return Line: Disconnect the return line from the pump. This is usually easier than the pressure line.
4. Disconnect the Pump Pulley: Remove the pulley bolt. This bolt is often very tight. Use the appropriate socket and a breaker bar if necessary. Some pulleys are held on by a retaining bolt in the center.
5. Remove the Pump Mounting Bolts: The power steering pump is usually attached to the engine block with several bolts. Locate and carefully remove these bolts. You may need extensions and universal joints to reach them all.
6. Remove the Pump: Once all the bolts are removed, carefully remove the power steering pump from the engine. It may be stuck due to corrosion, so gently pry it loose if necessary, using caution not to damage anything.
7. Installation (Reverse of Removal): When installing the new pump, make sure to use new gaskets or seals as needed. Tighten all bolts to the proper torque specifications (found in your repair manual). Refill the power steering fluid reservoir to the proper level.
8. Bleed the System (Crucial): After installing the new pump, you'll need to bleed the power steering system to remove any air bubbles. This usually involves turning the steering wheel back and forth while checking the fluid level. Refer to your repair manual for the specific bleeding procedure.
Important Notes:
* Fluid Type: Use the correct type of power steering fluid for your vehicle. Using the wrong fluid can damage the system.
* Gaskets and Seals: Replace any worn or damaged gaskets or seals during installation.
* Professional Help: If you are not comfortable performing this repair yourself, take your vehicle to a qualified mechanic.
Remember, this is a simplified overview. Always consult a repair manual specific to your 1991 Buick LeSabre Limited with a 3800 engine for detailed instructions, torque specifications, and diagrams. Safety should be your top priority.
