Dorman 555-016 Engine Expansion Plug

Overview of Dorman Engine Core Plug 555-016

The Dorman 555-016 engine core plug is a steel cup type expansion plug designed for reliable sealing in engine blocks. Compatible with select Pontiac and Toyota models, including the Bonneville, Catalina, and Land Cruiser, this core plug ensures proper engine maintenance and leak prevention.

• Constructed from durable steel material for long-lasting performance
• Cup type design for secure and effective sealing
• Fits engine core openings with diameters between 0.934 and 0.95 inches
• Compatible with Pontiac Bonneville and Catalina, as well as Toyota Land Cruiser models
• Sold as a single expansion plug for targeted replacement needs

Detailed Product Description

The Dorman 555-016 engine core plug is engineered to fit specific engine core openings, with a minimum diameter of 0.934 inches and a maximum diameter of 0.95 inches. Its steel construction provides resistance to corrosion and wear, making it suitable for use in the cooling system passages of engines. The cup type design allows the plug to expand and create a tight seal within the engine block, preventing coolant leaks and maintaining engine integrity. This part is essential for maintaining the proper function of the engine cooling system in Pontiac Bonneville and Catalina models, as well as Toyota Land Cruiser vehicles.

Common Applications and Problem Solving

• Sealing core holes in engine blocks to prevent coolant leaks
• Replacing worn or damaged expansion plugs in Pontiac Bonneville and Catalina engines
• Maintaining proper engine cooling system pressure in Toyota Land Cruiser models
• Preventing engine overheating caused by coolant loss
• Addressing corrosion-related failures in existing core plugs

Installation Notes and Tips

• Ensure the engine block core hole is clean and free of debris before installation
• Verify the core plug diameter matches the engine block specifications (0.934 to 0.95 inches)
• Use appropriate tools to press the plug evenly into place without damaging the cup type design
• Inspect surrounding areas for corrosion or damage during replacement
• Consult vehicle service manuals for torque specifications and installation procedures

Quality Assurance and Warranty

Dorman manufactures the 555-016 engine core plug to meet industry standards for durability and fitment. The steel material and precise dimensions ensure consistent performance in compatible Pontiac and Toyota engines. While specific warranty details may vary, Dorman typically offers coverage against manufacturing defects to support product reliability.