Safety First!
* Jack up the car securely: Use jack stands, never rely on just a jack.
* Wear safety glasses: Oil and other fluids can splash.
* Work in a well-ventilated area: Engine oil fumes are harmful.
* Dispose of used oil properly: Take it to a recycling center.
Tools and Materials:
* Jack and jack stands: Essential for safe vehicle support.
* Wheel chocks: To prevent accidental rolling.
* Oil pan gasket: Get the correct one for your specific engine (3.0L V6 or 3.8L V6, possibly others depending on the trim level). A high-quality gasket is recommended.
* New oil filter: While you're at it, change the oil filter.
* New oil: Use the correct weight and type of oil specified in your owner's manual.
* Wrench set: Metric, including sockets and ratchets. Sizes will vary depending on your specific engine.
* Oil pan drain plug wrench: Often a special socket size.
* Torque wrench: Essential for tightening bolts to the correct specification (found in your repair manual).
* Drain pan: To catch the old oil.
* Shop rags or paper towels: For cleaning.
* Pry bar (optional): May be helpful to gently separate the oil pan.
* Clean parts degreaser (optional): To clean the mating surfaces.
* Repair manual: A Haynes or Chilton manual for your specific year and model is invaluable. It will show you diagrams, torque specs, and other crucial information.
Procedure:
1. Preparation: Warm up the engine slightly to thin the oil, making it drain easier. Consult your repair manual for the precise location of all the components.
2. Drain the oil: Locate the oil drain plug on the bottom of the oil pan. Position your drain pan and carefully loosen and remove the drain plug. Let the oil drain completely – this can take a while.
3. Remove the oil filter: Unscrew the oil filter, letting any remaining oil drain into the pan.
4. Access the oil pan: This will vary depending on your specific engine. You might need to remove other components like the skid plate, exhaust components or other parts that block access to the oil pan. Your repair manual will guide you.
5. Remove the oil pan: Carefully remove the bolts securing the oil pan to the engine block. Work your way around evenly to prevent warping. Once the bolts are removed, the pan might be stuck due to the old gasket. Gently pry it loose using a pry bar if needed. Be cautious not to damage the oil pan or the engine block.
6. Clean the surfaces: Thoroughly clean both the engine block and the oil pan mating surfaces using a clean rag and degreaser (if used). Remove any old gasket material. Ensure both surfaces are perfectly clean and free of debris.
7. Install the new gasket: Carefully place the new oil pan gasket on the engine block, making sure it's properly seated.
8. Install the oil pan: Carefully lower the oil pan onto the gasket, ensuring it sits evenly.
9. Tighten the bolts: Install and tighten the oil pan bolts in a star pattern, using the correct torque specifications from your repair manual. This prevents warping of the pan.
10. Install the oil filter and refill with oil: Install the new oil filter, hand tighten, and then tighten another ¾ - 1 full turn with a filter wrench. Refill the engine with the correct amount and type of oil (check your owner's manual).
11. Replace the drain plug: Replace the oil drain plug and tighten it to the correct torque specification (from your repair manual).
12. Lower the vehicle: Carefully lower the vehicle using the jack.
13. Check for leaks: Start the engine and let it run for a few minutes. Carefully check for any leaks around the oil pan.
14. Check oil level: Once the engine is off, check the oil level using the dipstick. Add more oil if necessary.
Important Notes:
* Consult your repair manual: This procedure is a general guideline. Your 1985 Buick Riviera's repair manual contains specific instructions, torque specifications, and diagrams for your vehicle. Following the manual is crucial for success.
* Take pictures: Take photos as you disassemble things to help with reassembly.
* Don't rush: Take your time and be careful to avoid damaging parts.
This is a complex job. If you are not comfortable performing this repair, it is strongly recommended that you take your vehicle to a qualified mechanic. Improperly installing the oil pan gasket can lead to serious engine damage.
