Johnson Pump Washer F5B, F6B & F7B

The Johnson Pump Washer F5B, F6B & F7B is an essential replacement component for marine engine cooling systems found on mid-range Johnson outboards and inboard applications. This precision washer maintains proper seal integrity and pressure distribution within the pump assembly, preventing coolant leaks and ensuring reliable long-term engine protection. Whether you're running a 15-horsepower fishing boat or a larger recreational vessel, this OEM-specification washer is a critical maintenance item that prevents costly damage from coolant system failures.

Designed to fit the F5B, F6B, and F7B pump variants, this washer serves as a load-bearing interface between pump housing components, distributing clamping force evenly and preventing metal-to-metal contact that would compromise sealing surfaces. The compact 1-inch dimension profile allows seamless integration into tight engine compartments while maintaining the precise tolerances required for effective coolant circulation. At just 0.1 pounds, it's a lightweight component with outsized importance—a worn or missing washer often produces slow coolant seepage that compounds into thermostat housing corrosion and water jacket deterioration over a full season on the water.

Anglers and boaters who perform seasonal pump maintenance or address overheating issues will find this washer essential for reassembly. Keep a spare on board during extended trips or tournaments where access to parts dealers is limited—replacement takes minutes during normal cooling system service. Compatibility spans multiple Johnson outboard generations, making it a versatile addition to any marine maintenance kit for owners running vintage or mid-production models.