Tools You'll Likely Need:
* Socket wrench set: Various sizes (metric), including a deep socket.
* Ratchet: A 3/8" drive ratchet is generally sufficient.
* Wrench set: Metric wrenches, possibly including a box-end wrench for stubborn bolts.
* Extension(s): To reach difficult-to-access bolts.
* Jack and jack stands: Essential for safe working conditions.
* Wheel chocks: To secure the vehicle.
* Battery terminal wrench: For disconnecting the battery.
* Wire brush: To clean corrosion from battery terminals and starter connections.
* Penetrating oil (like PB Blaster): To loosen rusted or stubborn bolts.
* New starter motor: Ensure you get the correct one for your specific engine (e.g., 2.5L, 3.3L, 3.8L V6).
* Gloves and safety glasses: Protect yourself.
Steps (General Guide - Consult Your Repair Manual):
1. Disconnect the Battery: This is the most crucial step. Disconnect the negative (-) terminal first to prevent short circuits.
2. Access the Starter: The starter is usually located on the engine block, near the bellhousing (where the transmission connects to the engine). You'll likely need to access it from underneath the vehicle. Jack up the car, secure it on jack stands, and use wheel chocks for added safety.
3. Remove Components Obstructing Access: This varies depending on the engine and its accessories. You may need to remove:
* Some engine shielding or splash guards: These often bolt on.
* Possibly the air cleaner housing or components: To give you more room.
* Wiring harnesses: Carefully disconnect any connectors attached to the starter; take photos to help with reassembly.
4. Disconnect the Starter Wiring: There will be at least two large cables attached – one positive (+) and one from the ignition switch. Loosen the nuts carefully. Clean the terminals with a wire brush.
5. Remove the Starter Bolts: There are usually two or three bolts holding the starter to the engine block. These can be difficult to reach and may be seized. Apply penetrating oil and allow it to soak for a while before attempting to loosen the bolts.
6. Remove the Starter: Once the bolts are removed, carefully pull the starter away from the engine. It can be heavy, so be prepared.
7. Install the New Starter: Follow the steps in reverse order. Ensure the new starter is properly seated before tightening the bolts.
8. Reconnect the Wiring: Attach the wiring harness and carefully tighten the nuts.
9. Reinstall any removed components: Replace engine shielding, air cleaner housing, etc.
10. Lower the Vehicle: Carefully lower the vehicle from the jack stands.
11. Reconnect the Battery: Connect the battery positive (+) terminal first, then the negative (-) terminal.
12. Test the Starter: Try starting the engine. If it doesn't work, double-check all connections.
Important Considerations:
* Torque Specifications: Tighten all bolts to the manufacturer's specified torque. Using a torque wrench is highly recommended to prevent damage.
* Ground Connections: Ensure all ground connections are clean and secure. Poor ground connections can cause starting problems.
* Professional Help: If you are uncomfortable performing this repair yourself, it's best to take your vehicle to a qualified mechanic. A botched starter replacement can lead to further damage.
This is a general guide, and the exact procedure might vary depending on your specific Buick Century model. Always consult a repair manual for detailed, model-specific instructions. These manuals provide diagrams and specific torque specifications, significantly increasing your chances of a successful repair.
