Tools you'll need:
* Socket set: Including a deep well socket that fits your spark plugs (typically 5/8" or 13/16"). A 3/8" drive is usually sufficient.
* Spark plug socket with rubber insert: This is crucial to prevent rounding off the spark plug. The rubber grips the plug and prevents damage.
* Wrench: To loosen the coil packs. May be a 1/4" drive, 7/16" socket or a similar size (check your specific vehicle for the correct size).
* Extension(s): To reach the rear spark plugs.
* Ratchet: To turn the socket.
* Gloves: To protect your hands.
* New spark plugs: Use the correct type and gap recommended by your vehicle's owner's manual.
* Dielectric grease: Apply a small amount to the threads of the new spark plugs to aid installation and prevent corrosion.
* Torque wrench: Extremely important to properly tighten the new spark plugs to prevent damage. Check your owner's manual for the correct torque specification.
* Shop rags or paper towels: To clean up any spilled oil or debris.
* Optional: Spark plug gap tool: To check the gap on your new plugs if needed.
Procedure:
1. Disconnect the negative battery cable. This is crucial for safety.
2. Locate the spark plug coils: These are the black plastic components sitting on top of the spark plugs. They're located on both the passenger and driver's side of the engine.
3. Remove the coil packs: Use the appropriate wrench to carefully loosen and remove the coil packs. There may be a clip or retaining bolt securing them – consult your owner's manual if unsure. Once loose, carefully pull them up and off the spark plugs. Set them aside in a safe place to prevent damage.
4. Remove the old spark plugs: Using your spark plug socket with the rubber insert, carefully remove each spark plug. Do this slowly and carefully to avoid cross-threading or breaking the spark plug. If a plug is particularly stubborn, use penetrating oil and let it soak for a while before trying again.
5. Clean the spark plug wells: Use compressed air or a shop rag to clean out any dirt, debris, or oil that may have accumulated in the spark plug wells. This prevents contaminants from entering the cylinder.
6. Install the new spark plugs: Apply a small amount of dielectric grease to the threads of each new spark plug. Carefully screw the new spark plugs into the cylinder head by hand until they are snug. Do not overtighten by hand.
7. Tighten the new spark plugs with a torque wrench: This is the most crucial step. Over-tightening can damage the spark plugs and/or the cylinder head. Use your torque wrench to tighten the plugs to the manufacturer's specified torque. This is typically found in your owner's manual. Failing to use a torque wrench can lead to serious engine damage.
8. Install the coil packs: Carefully replace the coil packs onto the spark plugs, ensuring they are seated correctly.
9. Reconnect the negative battery cable.
10. Start the engine and check for any issues: Listen for any unusual noises or misfires. Let the engine run for a few minutes to ensure everything is working properly.
Important Considerations:
* Consult your owner's manual: This is the best resource for specific torque specifications, spark plug type, and any other details unique to your vehicle.
* Work in a well-ventilated area: Exhaust fumes can be harmful.
* Use the correct tools: Using the wrong tools can damage the spark plugs or the engine.
* Take your time: Rushing this job can lead to mistakes.
* If you are uncomfortable performing this task yourself, take your vehicle to a qualified mechanic.
This procedure is a general guideline. Always refer to your owner's manual for specific instructions and torque specifications for your 2004 Ram 1500 5.7L Hemi. Improper installation can lead to engine damage.
