Bosch 7403 Spark Plug

Overview of Bosch Nickel Spark Plug 7403

The Bosch Nickel Spark Plug 7403 is engineered for reliable ignition performance in Porsche 911 models. Designed with durable nickel center and ground electrodes, this spark plug supports consistent combustion and engine efficiency.

• Resistance: 6000 ohms for noise suppression
• Multiple ground electrode tips and configuration for improved spark distribution
• Nickel center electrode tip and core material for durability
• Pre-gap size of 0.8 mm optimized for ignition
• Three ground electrodes to enhance spark stability
• Flat seat type with 14 mm thread diameter and 19 mm reach
• Ceramic non-projected insulator for heat resistance
• Hex size 16 mm for standard installation tools
• Manufacturer heat range rating of 5
• Designed for 4-cycle engines

Detailed Product Description

The Bosch Nickel Spark Plug 7403 features a nickel center electrode tip and core combined with a triple ground electrode design, which helps maintain consistent spark delivery and combustion efficiency. The 6000 ohm resistance resistor reduces electromagnetic interference, protecting vehicle electronics. Its ceramic non-projected insulator and flat seat ensure proper sealing and heat dissipation. With a pre-gap size of 0.8 mm and a heat range of 5, this spark plug is tailored to meet the ignition requirements of Porsche 911 engines, supporting smooth engine operation and fuel efficiency.

About the Bosch Nickel Product Line

The Bosch Nickel line focuses on spark plugs with nickel electrode materials, providing a balance of durability and cost-effectiveness. This line is designed for standard ignition systems, offering reliable performance and longevity. The 7403 spark plug exemplifies this approach with its nickel center and ground electrodes, suitable for Porsche 911 secondary ignition needs.

Applications and Problem Solving

• Compatible with Porsche 911 models requiring 14 mm thread diameter spark plugs
• Addresses misfires caused by worn or damaged spark plugs
• Helps reduce electromagnetic interference with 6000 ohm resistor
• Improves ignition stability with multiple ground electrodes
• Supports consistent engine performance and fuel efficiency

Installation Notes and Tips

• Use a 16 mm socket wrench for installation or removal
• Ensure the pre-gap of 0.8 mm is maintained or adjusted as needed
• Apply anti-seize compound on threads if recommended by vehicle manufacturer
• Torque spark plug to manufacturer specifications to avoid damage
• Inspect ignition system components for wear during replacement

Quality Assurance

Bosch manufactures the 7403 spark plug to meet strict quality standards, ensuring consistent performance in Porsche 911 vehicles. The spark plug includes a resistor to minimize radio frequency interference and is constructed with durable nickel and ceramic materials. While specific warranty details are not provided, Bosch products typically adhere to industry quality controls and reliability benchmarks.