624-11379-00 – Check Valve – Yamaha Outboard

The 6241137900 Yamaha check valve is a genuine OEM Yamaha marine engine component designed to control one-way flow within your boat’s engine or crankcase system. A check valve allows fluid or air to move in one direction only, and it helps prevent backflow that could disrupt lubrication or crankcase pressure balance. This small part appears in Yamaha parts diagrams and listings as a VALVE, CHECK under part number 624-11379-00-00.

Check valves like the 6241137900 Yamaha check valve are often found in the crankcase or oil system on Yamaha outboards. They help maintain proper internal engine pressure and ensure oil or gases do not travel backwards. This performance is critical because backflow can lead to poor lubrication, excessive pressure, or unwanted emissions within the engine. By using the correct check valve, you can maintain smoother engine operation and avoid unnecessary wear on moving parts.

When you install this check valve, first verify that you place it in the correct orientation so that the flow goes in the intended direction. Then make sure it seats properly with clean passages to avoid leaks or binding. Also, inspect related hoses and gaskets while you service this area of the engine.

Because this is an OEM Yamaha part, you get precise fitment and reliable performance that often outlasts generic aftermarket alternatives. Boat owners and marine technicians often replace the check valve during routine engine rebuilds or when troubleshooting pressure and crankcase issues.

Shop at Arizona Outboard Dismantlers to keep your outboard running strong and ready for the water. Quality parts like this check valve help preserve engine health and improve reliability day after day.