NGK 4742 Spark Plug

Reliable Ignition with NGK Laser Iridium Spark Plug 4742

The NGK Laser Iridium Spark Plug 4742 offers consistent ignition performance designed for a range of vehicles requiring precise spark delivery. Engineered with durable materials, this spark plug supports efficient combustion and reliable engine operation.

• Iridium center electrode tip for enhanced durability and ignition
• Copper core center electrode for improved conductivity
• Standard ground electrode design with nickel core material
• Pre-gapped to .032 inches for optimal spark gap
• Flat seat type with 12mm thread diameter and 0.75 inch reach
• Heat range 8 suitable for various engine conditions
• Stud type electrical terminal and 5/8 inch hex size for installation

About the NGK Laser Iridium Spark Plug Line

The Laser Iridium Spark Plug line from NGK is engineered to provide precise ignition and long service life. Featuring an iridium center electrode tip, these plugs offer improved wear resistance and stable performance under demanding conditions. The combination of a copper core center electrode and iridium tip ensures efficient electrical conductivity and reliable spark generation, making the Laser Iridium series suitable for modern engines requiring consistent ignition quality.

Technical Details and Specifications

This NGK spark plug, part number 4742 (also referenced as Kr8di), features a single ground electrode with a nickel core, designed to maintain stable spark conditions. The pre-gap size of .032 inches is factory set to optimize ignition timing and combustion efficiency. The flat seat design and 12mm thread diameter ensure compatibility with engines requiring these specifications. With a heat range of 8, this spark plug is suited for engines operating under moderate to high temperatures. The stud-type electrical terminal and 5/8 inch hex size facilitate straightforward installation and secure connection.

Common Applications and Problem Solving

• Restores engine misfire issues caused by worn or fouled spark plugs
• Improves cold start performance and throttle response
• Reduces incomplete combustion and associated emissions
• Enhances fuel efficiency by maintaining consistent spark delivery
• Supports stable engine operation under varying load conditions

Installation Notes and Tips

Before installation, verify the spark plug gap is set to .032 inches to match engine requirements. Use a torque wrench to tighten the spark plug to the manufacturer’s recommended specification to avoid damage to the threads or seat. The 5/8 inch hex size allows for compatibility with standard spark plug sockets. Ensure the spark plug is compatible with your vehicle’s make and model by cross-referencing the part number 4742 or Kr8di.

Quality Assurance and Warranty

NGK spark plugs are manufactured to meet strict quality standards, ensuring reliable performance and durability. The Laser Iridium Spark Plug 4742 undergoes rigorous testing for heat resistance and electrical conductivity. While specific warranty details are not provided here, NGK typically offers coverage against manufacturing defects. Consult NGK or your parts supplier for warranty terms related to this spark plug.