2019 International MV Spark Plug Type & Gap

Quick reference

Why the right plug matters

For diesel engines like the Cummins B6.7 found in the 2019 International MV, spark plugs are not applicable. Diesel engines operate on a different principle called compression ignition. Instead of using a spark to ignite a fuel-air mixture, diesel engines compress air to extremely high pressures, which raises the air's temperature sufficiently to ignite the injected diesel fuel. Therefore, there are no spark plugs to consider for this vehicle.

While this article is about spark plugs, it's important to understand the fundamental difference in ignition systems. In gasoline engines, spark plugs are critical components that deliver an electrical spark to ignite the air-fuel mixture in the combustion chamber. The right spark plug is crucial for optimal engine performance, fuel efficiency, and emissions control. Key factors include:

• Heat Range: This refers to the plug's ability to dissipate heat. A plug that's too "cold" (dissipates heat quickly) can lead to fouling, while a plug that's too "hot" (dissipates heat slowly) can cause pre-ignition or detonation, which severely damages the engine.
• Electrode Metal: Different materials offer varying levels of durability and performance:
  • Copper: Traditional and inexpensive, copper plugs have excellent conductivity but wear faster, requiring more frequent replacement.
  • Platinum: More durable than copper, platinum plugs have a longer lifespan. They are often used in modern engines to meet extended service intervals.
  • Iridium: The hardest and most durable of common spark plug materials, iridium plugs offer the longest lifespan and best performance. They are typically found in high-performance or modern engines requiring extended service intervals.

How to gap a spark plug

This section is not applicable to the 2019 International MV as it is a diesel vehicle and does not use spark plugs. However, for general knowledge on gasoline engines, gapping a spark plug is the process of adjusting the distance between the center and ground electrodes to the manufacturer's specification. This precise gap is critical for a strong, consistent spark. You would typically use a wire-type gap gauge. Gently bend the ground electrode to achieve the correct gap, being careful not to damage the center electrode.

Replacement procedure tips

Since the 2019 International MV is a diesel vehicle, there is no spark plug replacement procedure. Maintenance for diesel engines primarily focuses on fuel system components, glow plugs (for cold starting), and air filtration.

For gasoline engines, a typical replacement procedure would involve:

1. Access: Removing components to gain access to the spark plugs, which are often located under coil-on-plug (COP) boots or a distributor cap.
2. Removal: Disconnecting the coil-on-plug connector and removing the retaining bolt, then carefully pulling off the coil pack. Using a spark plug socket with a rubber insert to remove the old plugs.
3. Anti-seize: There is a debate regarding anti-seize compound on spark plug threads. Some plug manufacturers advise against it, as it can alter torque values and potentially cause over-tightening or interference with the plug's ground path. Always consult the spark plug manufacturer's recommendations.
4. Dielectric Grease: Applying a small amount of dielectric grease to the inside of the spark plug boot (the part that connects to the ceramic insulator of the plug) helps prevent moisture ingress, aids in future removal, and ensures good electrical insulation.
5. Installation: Hand-threading new plugs to prevent cross-threading, then torquing them to spec. Reinstalling coil packs and connectors.

Known issues

The 2019 International MV, being a diesel truck, does not have the common spark plug-related issues found in gasoline engines. Issues like cracked porcelain on Ford 3-valve engines or broken plug shells are specific to certain gasoline engine designs and are not relevant here.

Need plugs replaced? Find a shop on Repairius.