Tools and Materials Needed:
- Socket wrench set
- Ratchet
- Flat-blade screwdriver
- Gasket scraper or putty knife
- New intake manifold gaskets (2)
- RTV silicone sealant
- Degreaser or engine cleaner
- Shop rags
Step-by-Step Instructions:
1. Preparation:
- Disconnect the negative battery terminal.
- Remove any accessories or components that may obstruct access to the intake manifold.
2. Remove Air Cleaner Assembly:
- Disconnect the air intake duct and any vacuum hoses connected to the air cleaner assembly.
- Remove the bolts or clips holding the air cleaner housing.
- Lift and remove the air cleaner housing.
3. Remove Intake Manifold Bolts:
- Locate and loosen the bolts securing the intake manifold to the cylinder heads.
- Do not completely remove the bolts yet.
4. Disconnect Hoses and Wiring:
- Disconnect any coolant hoses, vacuum lines, or electrical connectors attached to the intake manifold.
- Set aside any brackets or mounts that need to be removed.
5. Remove Old Gaskets:
- Use a flat-blade screwdriver or gasket scraper to pry off the old intake manifold gaskets carefully.
- Make sure to remove all remnants of the old gaskets from the sealing surfaces.
6. Clean Sealing Surfaces:
- Clean the mating surfaces of the cylinder heads and the intake manifold thoroughly using a degreaser or engine cleaner.
- Make sure the surfaces are free from dirt, oil, and any debris.
7. Apply RTV Sealant:
- Apply a thin bead of RTV silicone sealant to the sealing surfaces of the intake manifold gaskets.
- Make sure to follow the manufacturer's instructions for the correct application.
8. Install Intake Manifold Gaskets:
- Place the new intake manifold gaskets over the sealing surfaces and align them properly.
- Ensure the gaskets are seated correctly.
9. Install Intake Manifold:
- Place the intake manifold onto the cylinder heads and align it properly.
- Install and hand-tighten the intake manifold bolts.
10. Tighten Intake Manifold Bolts:
- Using a ratchet and socket, gradually tighten the intake manifold bolts in a crisscross pattern to evenly distribute the clamping force.
- Tighten the bolts to the specified torque as indicated in the service manual.
11. Reconnect Hoses and Wiring:
- Reconnect all coolant hoses, vacuum lines, and electrical connectors to the intake manifold.
12. Install Air Cleaner Assembly:
- Reinstall the air cleaner housing and attach any previously removed brackets or mounts.
- Connect the air intake duct and any vacuum hoses.
13. Reconnect Battery:
- Reconnect the negative battery terminal.
14. Test and Inspect:
- Start the engine and let it run for a few minutes.
- Check for any leaks from the intake manifold area.
- Ensure the engine runs smoothly and there are no unusual noises or vibrations.
Remember, this is a general guide, and the specific steps may vary depending on your particular Dodge 318 engine. It's always advisable to consult a factory service manual before performing any major repairs. If you're unsure about the procedure or encounter any difficulties, it's recommended to seek assistance from a qualified mechanic or refer to a professional repair guide.
