Dorman 555-009 Engine Expansion Plug

Overview of Dorman Engine Core Plug 555-009

The Dorman 555-009 engine core plug is designed for reliable sealing in Chevrolet, Oldsmobile, and Pontiac engines, specifically models like the Monza, Starfire, and Sunbird. Made from durable steel, this cup-type expansion plug ensures a secure fit and long-lasting performance.

• Constructed from high-quality steel for durability
• Cup-type design for effective sealing
• Maximum diameter of 0.593 inches and minimum diameter of 0.575 inches
• Compatible with Chevrolet Monza, Oldsmobile Starfire, and Pontiac Sunbird
• Sold as a single expansion plug

Detailed Product Description

The Dorman 555-009 engine core plug is engineered to meet the specifications required for proper sealing of engine block openings. Its steel construction provides resistance to corrosion and wear, which is critical in maintaining engine integrity. The cup-type design allows the plug to expand securely within the engine block bore, preventing coolant or oil leaks. With a diameter range between 0.575 and 0.593 inches, this plug fits precisely in the designated core holes of Chevrolet Monza, Oldsmobile Starfire, and Pontiac Sunbird engines, ensuring a tight and reliable seal.

Applications and Common Issues Addressed

• Sealing core holes in engine blocks to prevent fluid leaks
• Replacing worn or corroded core plugs that cause coolant loss
• Preventing engine overheating due to coolant leakage
• Maintaining engine pressure and preventing contamination
• Restoring engine block integrity after repair or rebuild

Installation Notes and Tips

• Ensure the engine block core hole is clean and free of debris before installation
• Verify the plug diameter matches the engine block specifications (0.575 to 0.593 inches)
• Use appropriate tools to press the plug evenly into place without damaging the cup-type edges
• Inspect the plug after installation for a secure fit and absence of gaps
• Consult vehicle service manual for torque and installation procedures specific to Chevrolet Monza, Oldsmobile Starfire, and Pontiac Sunbird

Quality Assurance and Warranty

Dorman manufactures the 555-009 engine core plug to meet industry standards for material quality and dimensional accuracy. The steel construction is tested for durability and corrosion resistance to ensure consistent performance. While specific warranty details may vary, Dorman typically offers coverage against manufacturing defects, providing confidence in the product's reliability for Chevrolet, Oldsmobile, and Pontiac engine repairs.