Replacing the valve covers on an LS engine is a task that, while relatively straightforward, requires precision and attention to detail to ensure a proper seal and avoid leaks.
Tools and Materials Needed
- New valve covers
- Valve cover gaskets
- RTV silicone sealant (if required)
- Torque wrench
- Socket set (8mm and 10mm sockets)
- Ratchet
- Extension bars
- Screwdriver set
- Cleaning supplies (brake cleaner, rags)
- Thread locker (optional)
Step 1: Preparation
- Safety First: Disconnect the battery to prevent any accidental electrical shorts.
- Clear the Work Area: Remove any components obstructing access to the valve covers, such as the air intake system and coil packs. Use an 8mm socket to remove the coil pack bolts.
Step 2: Removing the Valve Covers
- Remove Coil Packs: Unbolt the coil packs from the valve covers using an 8mm socket. Typically, each coil pack is secured with four bolts (M6x1.0 threads).
- Disconnect PCV Hoses and Electrical Connectors: Carefully disconnect the PCV hoses and any electrical connectors attached to the valve covers.
- Unbolt Valve Covers: Use a 10mm socket to remove the valve cover bolts. There are typically 4 bolts per valve cover (M6x1.0 threads, approximately 25mm in length).
Step 3: Cleaning and Inspection
- Remove Old Gaskets: Carefully remove the old valve cover gaskets and clean the gasket surfaces on the cylinder heads and valve covers with brake cleaner and a rag.
- Inspect Surfaces: Inspect the mating surfaces for any damage or debris. Ensure they are clean and smooth to guarantee a proper seal.
Step 4: Installing New Valve Covers
- Install New Gaskets: Place the new gaskets into the valve covers. Some gaskets may require a small amount of RTV silicone sealant at specific points, such as the corners of the camshaft caps.
- Position Valve Covers: Carefully position the new valve covers onto the cylinder heads, ensuring the gaskets remain in place.
Step 5: Bolting Down Valve Covers
- Hand Tighten Bolts: Start all valve cover bolts by hand to ensure proper alignment and avoid cross-threading.
- Torque Specifications: Using a torque wrench, tighten the valve cover bolts to the manufacturer’s specifications. For most LS engines, the valve cover bolts should be torqued to 106 in-lbs (12 Nm). Tighten in a crisscross pattern to ensure even pressure distribution.
- Reinstall Coil Packs: Reattach the coil packs to the valve covers, using the 8mm socket. Torque the coil pack bolts to 89 in-lbs (10 Nm).
Step 6: Reconnecting Components
- Reconnect PCV Hoses and Electrical Connectors: Reattach all PCV hoses and electrical connectors to the new valve covers.
- Reinstall Air Intake System: Reattach any components of the air intake system that were removed during the process.
Step 7: Final Checks
- Reconnect the Battery: Reconnect the battery terminals.
- Check for Leaks: Start the engine and let it run for a few minutes. Inspect the valve covers and surrounding areas for any signs of oil leaks.
- Final Inspection: Ensure all components are securely fastened and that the engine is running smoothly.
Technical Specifications Recap
- Valve Cover Bolts: M6x1.0 threads, approximately 25mm in length, torque to 106 in-lbs (12 Nm).
- Coil Pack Bolts: M6x1.0 threads, torque to 89 in-lbs (10 Nm).
Replacing the valve covers on an LS engine is a task that demands precision to prevent leaks and ensure optimal engine performance.
