Yamaha Motor Co., Ltd. YSC-10080-30-00 Pressure Relief Valve

The Yamaha YSC-10080-30-00 pressure relief valve is a metal valve assembly designed for Yamaha marine engine cooling systems, installed inside the thermostat housing to regulate internal pressure and prevent overpressure that could damage components during operation. Commonly used in Yamaha sterndrive and inboard engines, it helps maintain proper cooling system pressure within the thermostat housing assembly for reliable engine performance. Manufacturer: Yamaha Motor Co., Ltd.; Model: YSC-10080-30-00 (also referenced as YSC-10080-30-0C); Product Type: Pressure relief valve; Function: Regulates cooling system pressure and prevents overpressure; System Type: Yamaha sterndrive / inboard engines; Assembly Position: Thermostat housing component; Material: Metal valve assembly (OEM marine spec); Compatibility: Yamaha V6 / V8 marine engines (model-specific); Associated Components: Pressure relief spring (YSC-10080-20), valve seat (YSC-10080-40); Installation: Internal engine cooling assembly; Duty Cycle: Continuous operation during engine runtime; Status: OEM marine component / limited availability; Common Replacements: Yamaha YSC-10080-30-0C, Yamaha pressure relief valve kits (thermostat housing assemblies), aftermarket marine pressure relief valves (matched spec).