1. Product Overview
The Motorcraft SP-479 Spark Plug is engineered for reliable ignition in various Ford, Lincoln, and Mercury vehicles. Designed to meet original equipment specifications, it ensures consistent engine performance and fuel efficiency. This spark plug is suitable for both conventional distributor-equipped and coil-on-plug ignition systems.
- Used for conventional distributor-equipped and coil-on-plug ignition systems found in many Ford, Lincoln and Mercury vehicles.
- High melting point provides excellent resistance to erosion.
2. Installation Guide
2.1. Preparation
- Ensure the engine is cool before beginning work.
- Gather necessary tools: spark plug socket, ratchet, torque wrench, dielectric grease, anti-seize compound, and any specific tools for removing engine covers or air intake components.
- Disconnect the negative terminal of the vehicle's battery to prevent accidental electrical discharge.
2.2. Step-by-Step Installation
- Access Spark Plugs: Depending on your vehicle model, you may need to remove engine covers, air intake hoses, or other components to gain clear access to the ignition coils and spark plugs.
- Disconnect Ignition Coil: Carefully disconnect the electrical connector from the ignition coil. Press the release tab and pull gently.
- Remove Ignition Coil: Use a wrench or socket to remove the bolt securing the ignition coil. Once the bolt is removed, gently twist and pull the ignition coil upwards to remove it from the spark plug well.
- Remove Old Spark Plug: Insert the spark plug socket into the well and onto the spark plug. Loosen the old spark plug by turning counter-clockwise. If the spark plug is stuck, apply a penetrating lubricant and allow it to soak before attempting removal again.
- Inspect New Spark Plug: The Motorcraft SP-479 spark plugs are typically pre-gapped from the factory. Verify the gap using a spark plug gap tool, but avoid adjusting the gap unless absolutely necessary, as improper adjustment can damage the electrode.
- Apply Anti-Seize: Apply a small amount of anti-seize compound to the threads of the new spark plug. This helps prevent the plug from seizing in the cylinder head.
- Install New Spark Plug: Hand-thread the new spark plug into the cylinder head to avoid cross-threading. Once finger-tight, use a torque wrench to tighten the spark plug to the manufacturer's specified torque (typically around 11 ft-lbs for aluminum heads, but always consult your vehicle's service manual for exact specifications).
- Install Ignition Coil: Apply a small amount of dielectric grease to the inside of the ignition coil boot. This helps create a good seal and prevents moisture intrusion. Slide the ignition coil back into the spark plug well, ensuring it seats properly. Secure it with the retaining bolt and tighten it.
- Reconnect Electrical Connector: Reconnect the electrical connector to the ignition coil until it clicks into place.
- Repeat for Remaining Cylinders: Repeat steps 2-9 for all remaining spark plugs.
- Reassemble Components: Reinstall any engine covers, air intake components, or other parts that were removed during the process.
- Reconnect Battery: Reconnect the negative terminal of the vehicle's battery.
3. Operating Principles
Spark plugs are a critical component of your vehicle's ignition system. They ignite the air-fuel mixture in the engine's combustion chambers, creating the power stroke that drives the engine. The SP-479 is designed to deliver a consistent, powerful spark under various operating conditions, contributing to efficient combustion and overall engine performance.
4. Maintenance
Regular inspection and replacement of spark plugs are essential for maintaining optimal engine health and performance. Consult your vehicle's owner's manual for recommended service intervals. Typically, spark plugs should be inspected every 30,000 to 50,000 miles and replaced as needed, or according to the manufacturer's schedule. Using the correct spark plug type, such as the Motorcraft SP-479, is crucial for proper engine function.
5. Troubleshooting Common Issues
- Engine Misfires: A common symptom of a failing spark plug is an engine misfire, which can manifest as rough idling, hesitation, or a loss of power.
- Reduced Fuel Economy: Worn spark plugs can lead to inefficient combustion, resulting in decreased fuel efficiency.
- Difficulty Starting: If your engine struggles to start, especially in cold weather, worn spark plugs could be a contributing factor.
- Check Engine Light: A faulty spark plug or ignition coil can trigger the Check Engine Light. Diagnostic tools can help identify the specific cylinder causing the issue.
If you experience any of these symptoms, inspect your spark plugs and ignition system components. Replacement of worn spark plugs with genuine Motorcraft parts like the SP-479 can often resolve these issues.
6. Specifications
| Feature | Specification |
|---|---|
| Brand | Motorcraft |
| Model Number | SP-479 |
| Core Material | Copper |
| Thread Size | 14mm |
| Top Material Type | Copper |
| Vehicle Service Type | UTV (also compatible with various Ford, Lincoln, Mercury vehicles) |
| UPC | 031508379503 |
| OEM Part Number | SP479 |
| Manufacturer | Ford Motor Company |
| Item Weight | 1.44 ounces |
| Product Dimensions | 4.2 x 3.6 x 1.1 inches |
7. Warranty and Support
For warranty information and technical support regarding your Motorcraft SP-479 Spark Plug, please refer to the documentation provided with your purchase or visit the official Motorcraft website. As an OEM part from Ford Motor Company, it is backed by their standard warranty policies.
For additional assistance, you may contact Motorcraft customer service directly or consult an authorized Ford service center.
Important: Always use genuine Motorcraft parts for optimal performance and to maintain vehicle warranty.
