Quicksilver 64878 Poppet Relief Valve Compression Spring

The Quicksilver 64878 is a genuine OEM poppet relief valve compression spring designed for Mercury and Mariner outboard engines. This critical component is compatible with 40-300hp engines and plays a vital role in maintaining proper water flow regulation and cooling system performance.

Key Features:

• Genuine Mercury Quicksilver OEM part, not aftermarket
• Black compression spring design for reliable pressure regulation
• Made with quality materials to ensure optimal performance and longevity
• Cross-references: 24-64878, 64878
• UPC: 745061167117

The poppet relief valve manages water flow at mid-to-high RPMs, ensuring the cooling system maintains optimal operating temperature and prevents overheating. Over time, the spring and other valve components can degrade due to exposure to heat, pressure, and debris, making periodic replacement essential for maintaining engine health and performance.

This spring is commonly included in complete poppet valve rebuild kits and is suitable for a wide range of Mercury and Mariner V6 2-stroke and EFI models including V-135, V-150, V-175, V-200, and various performance series engines.