Dorman 555-054 Engine Expansion Plug

Durable Steel Engine Core Plug for Ford and Mercury Vehicles

The Dorman 555-054 engine core plug is designed to provide a reliable seal for engine block openings in select Ford and Mercury models. Crafted from steel with a reverse taper cup design, this expansion plug ensures a secure fit and long-lasting performance.

• Constructed from durable steel for strength and corrosion resistance
• Reverse taper cup design for a tight, secure seal
• Maximum diameter of 2.385 inches and minimum diameter of 2.388 inches for precise fitment
• Compatible with a range of Ford and Mercury vehicles including Mustang, F-150, Cougar, and Thunderbird
• Sold as a single expansion plug for engine block sealing

Technical Details and Specifications

The Dorman 555-054 engine core plug features a reverse taper cup type, which allows it to expand and lock firmly within the engine block bore. Made from steel, this plug offers resistance to engine heat and corrosion, maintaining the integrity of the engine’s coolant passages. The plug’s diameters—2.385 inches maximum and 2.388 inches minimum—are engineered to match factory specifications, ensuring compatibility with various Ford and Mercury models such as the F-100, F-250, Mustang, and Colony Park. This precise sizing helps prevent coolant leaks and maintains engine performance.

Compatible Ford and Mercury Models

This engine core plug is compatible with multiple Ford and Mercury vehicles, including:

• Ford Mustang
• Ford F-150, F-100, F-250, F-350
• Ford Cougar
• Ford Thunderbird
• Mercury Colony Park
• Mercury Marquis
• Mercury Marauder
• Mercury Montego
• Mercury Villager
• Ford LTD

Common Applications and Problem Resolution

The Dorman 555-054 engine core plug is used primarily to seal engine block core holes that are created during the manufacturing process. It helps address issues such as:

• Coolant leaks from engine block core holes
• Corrosion damage around core plug areas
• Engine overheating caused by coolant loss
• Replacement of worn or damaged factory core plugs
• Maintaining engine block pressure integrity

Installation Notes and Tips

When installing the Dorman 555-054 engine core plug, ensure the engine block surface is clean and free of debris. The reverse taper cup design requires careful alignment to seat properly within the bore. Use appropriate tools to press the plug evenly into place without damaging the steel material. Verify the plug is flush with the engine block surface to prevent leaks. It is recommended to inspect surrounding areas for corrosion or damage before installation.

Quality Assurance and Warranty

Dorman engine core plugs are manufactured to meet or exceed OEM specifications for fit and function. The steel construction provides durability under typical engine operating conditions. While specific warranty details may vary, Dorman products generally come with a limited warranty against defects in material and workmanship. Refer to the product packaging or manufacturer documentation for exact warranty terms.