Overview
The Dorman 555-084 expansion plug is a direct-fit OE replacement for damaged or missing engine expansion plugs (commonly called freeze plugs or core plugs) on select Ford and Mercury vehicles. This steel cup-type plug is engineered to match factory specifications and provide dependable sealing performance over the vehicle’s service life.
Key Features
- Direct OE replacement—matches fit and function of factory original parts
- Steel cup construction designed for corrosion resistance and durability
- Precision manufactured to exact OEM dimensions and material specifications
- Backed by lifetime limited warranty against defects in material and workmanship
- 10-pack quantity provides comprehensive coverage for multi-plug repairs
Technical Specifications
The 555-084 meets strict OEM requirements for direct replacement on compatible models:
- Diameter: 2-1/4 inches (2.25″)
- Plug Height: 0.370 inches
- Cup Type: Steel cup design with sealed rim
- Closed End Diameter: 2.25 inches
- Open End Diameter: 2.27 inches
- Quantity per Box: 10 units
- Material: Quality steel for corrosion resistance
Typical Applications
The Dorman 555-084 is commonly used for engine block expansion plug replacement on:
- Ford F-150 and other Ford truck models (1975–1996 and later)
- Ford Escape, Freestyle, and Ranger models
- Mercury Cougar, Montego, and Marquis
- Mercury Mariner and other Ford-platform vehicles
- Any compatible engine block freeze hole repair requiring a 2-1/4″ cup-type plug
Compatibility & Replacements
Compatible With
- Ford F-150 (multiple model years)
- Ford Escape, Freestyle, Ranger, and Mariner
- Mercury Cougar, Montego, Marquis, and Mariner
- Lincoln vehicles using equivalent engine platforms
- Select 1965–2005 Ford, Mercury, and Lincoln models (verify fitment)
Replaces / Drop-In Replacement For
Verify exact OEM part numbers for your vehicle with a dealer or service manual. The 555-084 is engineered as a direct OE replacement for factory expansion plugs on the vehicle models listed above; always confirm fitment before ordering.
Works With
- Standard engine block expansion plug (freeze plug) installations
- Applicable to gasoline engine blocks requiring 2-1/4″ cup-type sealing plugs
- Compatible with hand tools or pneumatic expansion plug installers per manufacturer instructions
