Dorman 555-074 Engine Expansion Plug

Overview of Dorman Engine Core Plug 555-074

The Dorman 555-074 engine core plug is a steel cup-type expansion plug designed for reliable sealing in various Ford and Mercury vehicles. Engineered to precise diameter specifications, this core plug ensures a secure fit and long-lasting performance in your engine block.

• Constructed from durable steel material for strength and corrosion resistance
• Cup-type design for effective sealing in engine block openings
• Maximum diameter of 0.526 inches and minimum diameter of 0.518 inches for accurate fitment
• Compatible with multiple Ford and Mercury models including Bronco, F-150, and Thunderbird
• Sold as a single expansion plug for replacement or repair needs

Detailed Product Description

The Dorman 555-074 engine core plug is manufactured from steel, providing the necessary durability to withstand engine operating conditions. Its cup-type design allows it to expand and seal core holes in the engine block, preventing coolant or oil leaks. With a maximum diameter of 0.526 inches and a minimum diameter of 0.518 inches, this plug fits precisely into the designated openings, ensuring a tight seal. This part is compatible with a range of Ford and Mercury vehicles, including popular models such as the Ford Bronco, F-150, and Mercury Cougar, making it a practical choice for engine maintenance and repair.

Common Applications and Issues Addressed

• Sealing core holes in engine blocks to prevent coolant leaks
• Replacing worn or corroded expansion plugs in Ford Bronco and Mercury Grand Marquis engines
• Restoring engine block integrity in Ford Econoline series vehicles
• Preventing oil contamination caused by faulty core plugs in F-250 and F-350 trucks
• Maintaining proper engine cooling system pressure in Mercury Thunderbird and LTD models

Installation Notes and Tips

• Ensure the engine block core hole is clean and free of debris before installation
• Use appropriate tools to press the plug evenly into the opening without damaging the cup edges
• Verify the plug diameter matches the engine block specifications to avoid leaks
• Inspect surrounding areas for corrosion or damage that may require additional repair
• Consult vehicle service manuals for torque and installation procedures specific to Ford and Mercury models

Quality Assurance and Warranty

Dorman engine core plugs are manufactured to meet or exceed OEM standards for fit, form, and function. The 555-074 part number undergoes rigorous quality control to ensure durability and reliable sealing performance. While specific warranty details may vary, Dorman typically offers limited warranties covering defects in material and workmanship to provide confidence in product longevity.