Denso 3137 Spark Plug

Overview of the Denso 3137 Spark Plug

The Denso 3137 spark plug is engineered for reliable ignition performance in select BMW, Jaguar, Mercedes-Benz, and Saab models. Featuring a U-groove ground electrode tip design, this spark plug supports efficient combustion and consistent engine operation.

• U-groove ground electrode tip for improved spark exposure
• Nickel ground electrode core and center electrode tip for durability
• Copper center electrode core for optimal conductivity
• Standard ground configuration with a single ground electrode
• Flat seat type with 19.00 mm reach and 14.00 mm thread diameter
• Pre-gap size of 0.8 mm for precise ignition timing
• Hex size of 16.0 mm for installation compatibility
• Manufacturer heat range rating of 16

Details on the U-Groove Conventional Product Line

The Denso U-Groove Conventional line focuses on spark plugs with a distinctive U-groove ground electrode tip design. This design enhances spark exposure to the air-fuel mixture, promoting more complete combustion. The 3137 part number belongs to this line, combining conventional materials like nickel and copper to balance durability and conductivity for secondary ignition systems.

Technical Description and Attributes

The Denso 3137 spark plug incorporates a nickel ground electrode core and tip, providing resistance to wear and corrosion. The copper center electrode core improves electrical conductivity, ensuring efficient spark delivery. With a single ground electrode and a U-groove tip design, this spark plug optimizes the spark path for better ignition. The flat seat type and 19.00 mm reach make it suitable for specific engine configurations. The pre-gap size of 0.8 mm is factory set to maintain proper spark gap, reducing misfires and improving fuel efficiency.

Compatible Vehicles and Applications

This spark plug is compatible with a range of BMW, Jaguar, Mercedes-Benz, and Saab vehicles, including models such as BMW 750iL, 850Ci, and 850CSi; Jaguar XK8; Mercedes-Benz C220, E320, S500, and SL500; and Saab 900 and 9000 series. The Denso 3137 is designed to meet the ignition requirements of these vehicles, ensuring proper fitment and performance.

• Resolves ignition misfires and rough idling
• Improves cold start performance
• Reduces engine knocking and pinging
• Enhances fuel combustion efficiency
• Prevents electrode wear and corrosion

Installation Notes and Tips

When installing the Denso 3137 spark plug, ensure the engine is cool to avoid thread damage. Use a torque wrench to tighten the spark plug to the manufacturer’s specifications, typically around 20-25 Nm, to prevent over-tightening. Verify the pre-gap size of 0.8 mm before installation, adjusting if necessary. The 16.0 mm hex size allows for standard spark plug socket compatibility. Always inspect the spark plug threads and seat for cleanliness to ensure proper sealing.

Quality Assurance and Warranty

Denso spark plugs, including the 3137 part number, are manufactured to meet OEM standards for secondary ignition components. The materials and design undergo rigorous testing to ensure durability and consistent performance. While specific warranty details may vary, Denso products typically come with a limited warranty covering defects in materials and workmanship.