31641-ZVP-003 Pulley Lock Nut - Overview. The 31641-ZVP-003 Pulley Lock Nut is a critical component designed to secure the pulley within Honda marine engine systems. It plays an essential role in maintaining the proper operation of the marine engine by preventing pulley slippage or detachment. Crafted to OEM quality standards, this genuine Honda part ensures reliable integration with existing hardware, delivering optimal performance and longevity.. Key Features. Specialized fastener securing pulleys in Honda marine engines.. Genuine Honda OEM component built to factory specifications.. Ensures mechanical stability and consistent engine operation.. Precisely manufactured for seamless integration with corresponding parts.. Preserves system integrity and reduces maintenance disruptions.. Contributes to overall durability and performance in marine environments.. Why Choose Genuine OEM. Using original Honda parts like the 31641-ZVP-003 Pulley Lock Nut preserves the integrity of your marine