Bosch 6739 Spark Plug

Overview of Bosch OE Fine Wire Platinum Spark Plug 6739

The Bosch OE Fine Wire Platinum Spark Plug 6739 is engineered for reliable ignition performance in select Ford, Lincoln, and Mercury vehicles. Designed with precision materials and a fine wire platinum center electrode, this spark plug supports efficient combustion and consistent engine operation.

• Fine wire platinum center electrode for improved ignition
• 6000 ohm resistor to reduce electrical noise
• Standard ground electrode with nickel tip and J-gap configuration
• Copper core center electrode for enhanced conductivity
• Tapered seat type with 14 mm thread diameter and 25 mm reach
• Non-projected ceramic insulator with a 1.3 mm pre-gap size
• Hex size 16 mm with non-removable nut electrical terminal
• Manufacturer heat range 8 suitable for various driving conditions

Detailed Product Features and Specifications

This Bosch spark plug features a fine wire platinum center electrode tip that enhances ignition reliability and durability. The copper core center electrode improves thermal conductivity, helping maintain optimal operating temperatures. The ground electrode is constructed from nickel with a standard tip design and a J-gap configuration, which supports stable spark generation. The spark plug includes a 6000 ohm resistor to minimize radio frequency interference, ensuring compatibility with modern vehicle electronics.

The insulator is made from durable ceramic material with a non-projected design, providing excellent electrical insulation and heat resistance. The spark plug has a tapered seat type and a thread diameter of 14 mm with a 25 mm reach, making it compatible with specific Ford, Lincoln, and Mercury models. The pre-gap size is set at 1.3 mm, optimized for efficient combustion. The hex size of 16 mm and a non-removable nut electrical terminal facilitate secure installation and connection.

About the OE Fine Wire Platinum Product Line

The Bosch OE Fine Wire Platinum line focuses on delivering spark plugs with fine wire platinum electrodes that provide consistent ignition performance and extended service life. This product line is designed to meet or exceed original equipment specifications, making it suitable for drivers seeking reliable replacement parts for their vehicles. The 6739 spark plug exemplifies this line’s emphasis on precision engineering and material quality.

Compatible Vehicles and Common Applications

This spark plug is compatible with a range of Ford, Lincoln, and Mercury vehicles, including:

• Ford C-Max, Escape, Explorer, Fusion, Transit-150, Transit-250, Transit-350, Transit-350 HD, Transit Connect
• Lincoln Corsair, MKZ
• Mercury Mariner, Milan, SSV Plug-In Hybrid

It is designed for 4-cycle engines and is suitable for use in secondary ignition systems.

Common Issues Addressed by Bosch Spark Plug 6739

• Engine misfires and rough idling
• Poor fuel efficiency due to incomplete combustion
• Difficulty starting the engine in cold conditions
• Increased emissions from inefficient ignition
• Electrical interference affecting vehicle electronics

Installation Notes and Tips

When installing the Bosch OE Fine Wire Platinum Spark Plug 6739, ensure the spark plug gap is set to the recommended 1.3 mm pre-gap size if adjustment is necessary. Use a torque wrench to tighten the spark plug to the manufacturer’s specifications to avoid damage to the tapered seat or threads. The 16 mm hex size allows for standard spark plug socket compatibility. Avoid over-tightening to maintain proper sealing and prevent thread damage.

Quality Assurance and Warranty

Bosch spark plugs are manufactured to meet strict quality standards, ensuring consistent performance and durability. The OE Fine Wire Platinum 6739 spark plug includes a resistor to reduce electrical noise and is constructed with high-quality materials such as platinum, copper, and nickel. While specific warranty details are not provided here, Bosch products typically come with manufacturer-backed quality assurance to support reliable operation in compatible vehicles.