NGK 3787 Spark Plug

NGK Laser Iridium Spark Plug Overview

The NGK Laser Iridium Spark Plug 3787 is engineered for reliable ignition performance in select Mazda vehicles. Designed with advanced materials and precise specifications, this spark plug supports efficient combustion and consistent engine operation.

• Iridium center electrode tip for enhanced durability
• Copper core materials in both center and ground electrodes for optimal conductivity
• Standard ground electrode tip and configuration for reliable spark delivery
• Non-removable nut electrical terminal type for secure connection
• Pre-gap size of 0.032 inches for precise ignition timing
• Tapered seat type and 14mm thread diameter for proper fitment
• Compatible with Mazda 3, Mazda 6, and Mazda CX-7 models

Detailed Product Features and Specifications

This NGK spark plug, part number 3787 (also referenced as Iltr6a-8g), features a 5,000 ohm resistance rating to reduce electrical noise and protect vehicle electronics. The center electrode tip is made of iridium, a material known for its high melting point and wear resistance, which contributes to longer service life. Both the center and ground electrodes have copper cores, enhancing thermal conductivity and improving ignition efficiency. The spark plug has a single ground electrode with a standard tip design, ensuring consistent spark generation. Its tapered seat and 14mm thread diameter provide a secure and proper fit in the combustion chamber. The insulator height measures 53mm, and the reach is 25mm, matching OEM specifications for compatible Mazda engines. The manufacturer heat range is 6, suitable for the intended applications.

About the NGK Laser Iridium Spark Plug Line

The Laser Iridium Spark Plug line from NGK is designed to offer a balance of durability and performance. Utilizing iridium for the center electrode tip, these plugs provide improved wear resistance compared to conventional plugs. This line is engineered to maintain stable ignition and efficient combustion over extended service intervals, making it a suitable choice for vehicles requiring reliable secondary ignition components.

Compatible Vehicles and Common Applications

• Replacement spark plug for Mazda 3 models
• Suitable for Mazda 6 engines requiring iridium spark plugs
• Compatible with Mazda CX-7 ignition systems
• Addresses issues such as misfires, rough idling, and poor fuel economy
• Helps resolve ignition-related starting difficulties

Installation Notes and Tips

When installing the NGK Laser Iridium Spark Plug 3787, ensure the spark plug gap is set to the specified pre-gap size of 0.032 inches if adjustment is necessary. Use a torque wrench to tighten the plug to the manufacturer’s recommended torque to avoid damage to the tapered seat. The non-removable nut terminal type requires compatible ignition wires or coil connectors. Inspect the spark plug threads and combustion chamber for debris before installation to ensure proper seating and performance.

Quality Assurance and Warranty

NGK spark plugs are manufactured to meet strict quality standards, ensuring consistent performance and durability. The Laser Iridium Spark Plug 3787 undergoes rigorous testing for resistance, electrode integrity, and fitment accuracy. While specific warranty details may vary, NGK products typically come with a limited warranty against manufacturing defects. Consult NGK or your vehicle’s service manual for detailed warranty information.