Tools You'll Need:
* Socket set: You'll need sockets to remove various bolts. The sizes will vary depending on the specific fasteners on your car, but expect to need at least 8mm and 10mm sockets.
* Wrench set: May be necessary for some bolts, particularly if they are difficult to reach with a socket.
* Ratchet and extensions: To reach the bolts in tighter spots.
* Pliers: To disconnect electrical connectors.
* Drain pan: To catch any spilled oil.
* Shop rags or paper towels: For cleaning.
* Torque wrench (optional but recommended): For proper re-installation of the valve covers.
Steps:
1. Disconnect the Battery: This is crucial to prevent accidental shorts and damage to your car's electrical system.
2. Locate the Valve Covers: They're the metal covers on top of the engine, one on each side of the cylinder heads.
3. Remove the PCV Valve Hose(s): There are one or more hoses connected to the valve covers. Carefully disconnect these using pliers if needed; gently pulling them is often sufficient.
4. Remove the Spark Plug Wires (Optional but Recommended): While not strictly necessary for valve cover removal, removing the spark plug wires makes accessing some bolts easier and reduces the risk of damaging the wires. Mark each wire's location before removing to ensure proper reinstallation.
5. Locate and Remove the Valve Cover Bolts: These bolts are typically located around the perimeter of each valve cover. Use the appropriate socket and ratchet to remove them one by one. Keep them organized in a tray or container to avoid mixing them up during reinstallation. Some bolts may be longer than others; pay attention to their position.
6. Carefully Lift the Valve Cover: Once all the bolts are removed, gently lift the valve cover off the engine. Be aware that there may still be some oil residue inside; the drain pan will help catch it. Work slowly and deliberately. Sometimes the valve cover gasket can stick slightly to the engine; you might need a putty knife or similar tool (plastic is safer) to help gently separate them.
7. Clean the Valve Cover and Engine Surface: Clean the valve cover and the mating surface on the engine with a clean rag. This is important for a proper seal when you reinstall the valve cover. Remove any old gasket material.
8. Install New Gasket (Highly Recommended): Use a new gasket specifically designed for your 4.6L engine. This is crucial to prevent oil leaks.
9. Reinstall the Valve Cover: Carefully align the valve cover with the engine and gently lower it into place.
10. Replace the Bolts: Install the bolts evenly, tightening them gradually in a star pattern (opposite bolts, then the next pair, etc.) to ensure an even seal. Do not overtighten! If you have a torque wrench, use the manufacturer's specified torque value.
11. Reconnect the PCV Valve Hose(s): Reattach the PCV valve hoses securely.
12. Reconnect the Spark Plug Wires (If Removed): Make sure to reconnect the spark plug wires to their correct locations.
13. Reconnect the Battery: Reconnect the battery terminals.
Important Considerations:
* Oil: Be prepared for some oil spillage. Have plenty of rags or paper towels ready.
* Gasket: Replacing the valve cover gasket is strongly recommended; reusing an old gasket almost always leads to leaks.
* Torque Specifications: Consult a repair manual for your specific vehicle to find the correct torque specifications for the valve cover bolts. Overtightening can strip the threads or warp the valve cover.
This guide provides general instructions. Always consult a repair manual specific to your 1998 Lincoln Town Car for detailed diagrams, torque specifications, and any unique steps that may be required. If you are not comfortable performing this repair yourself, it's best to take your vehicle to a qualified mechanic.
