Dorman 42025 Spark Plug Thread Repair Kit

Dorman 42025 Spark Plug Thread Repair Kit

Restore damaged spark plug threads with the Dorman 42025 spark plug thread repair kit. Built with a coated steel insert and a flanged design, it provides a direct repair solution for stripped spark plug threads on select Ford and Lincoln applications.

Key Features

• Designed for spark plug thread repair on specified vehicles
• 5/8-18 nominal insert thread size with spark plug thread type
• Steel insert with coated finish for added durability
• Flanged insert design for secure seating
• Clockwise thread direction
• Medium insert reach for the listed cylinder head applications
• Compatible with 1997-2008 Ford and Lincoln vehicles in the fitment list

Detailed Description

The Dorman 42025 is a cylinder head repair kit made to replace stripped spark plug threads in select Ford and Lincoln engines. It is engineered around a steel, coated insert with a flanged profile and clockwise thread direction, helping restore the spark plug mounting surface without changing the original application requirements. This part number is commonly searched for Ford F-150, Ford Expedition, and Lincoln Navigator spark plug thread repair needs, as well as other listed E-Series and Super Duty applications. If you are sourcing Dorman 42025 for a Ford F-250 Super Duty or Ford Mustang repair, verify the engine and cylinder head details against the fitment list before service.

What It Helps Fix

• Stripped spark plug threads in the cylinder head
• Damaged spark plug seating surfaces
• Thread wear from repeated plug removal and installation
• Loss of spark plug retention caused by thread failure
• Repair needs on select Ford and Lincoln spark plug thread applications

Installation Notes and Tips

Confirm the cylinder head thread size and spark plug application before beginning repair. This kit does not include corresponding drill bits, taps, or an insert tool, so the correct service tools must be sourced separately. Follow the vehicle service procedure for thread repair, clean the bore thoroughly, and inspect the spark plug seat after installation. Use the fitment list to confirm the exact year and model, including Ford E-150, E-250, E-350 Super Duty, F-150, F-250 Super Duty, F-350 Super Duty, Expedition, Mustang, Excursion, and Lincoln Navigator applications.

Quality Assurance

Dorman designs this repair kit with quality components for reliable performance and durability in the specified applications. This part cross-references Monroe Shocks & Struts (e.g., 172286, 182286) for the same application.