Dorman 555-005 Engine Expansion Plug

Engine Core Plug for OE-Style Repair

Dorman 555-005 is a steel engine expansion plug built to match the fit and function of the original plug on specified vehicles. Its cup-type design and measured diameter range help support a secure seal in the engine block during core plug replacement on applications such as Ford and Chevrolet engine service.

Key Features

• Steel construction for durable engine hardware service
• Cup-type expansion plug design
• Maximum diameter: 0.536 in.
• Minimum diameter: 0.464 in.
• Engineered to match original part fit and function
• Fits specified Ford and Chevrolet applications

Product Details

This Dorman engine core plug is used in engine block cooling system repair where a worn, corroded, or leaking expansion plug needs replacement. The steel body provides a practical OE-style solution for service work that requires accurate sizing and a reliable seal. Part number 555-005 is also referenced by cross numbers 381-3095 and EPC-169 for the same application.

Common Repair Uses

• Stops coolant loss caused by a leaking core plug
• Replaces a rusted or damaged engine expansion plug
• Restores sealing at an engine block opening
• Addresses cooling system service after corrosion-related failure

Installation Notes

Verify the plug diameter against the engine block opening before installation. Clean the bore thoroughly and inspect for pitting, distortion, or debris that could affect sealing. Confirm the correct application by vehicle and engine configuration before installing Dorman 555-005.

Quality Assurance

Dorman designs this engine expansion plug to match the original part’s fit and function on specified vehicles. The steel construction and OE-style dimensions support consistent service results in engine hardware repair.