4 Stroke Mercury Outboard Water Flow Diagram: 2026 Guide
The 4-stroke Mercury outboard cooling path draws raw water through lower-unit intake screens via a rubber impeller pump, routing coolant up through the drive shaft housing to the thermostat, fuel cooler, engine block jacket, and exhaust manifold, before exiting through the propeller hub exhaust and tell-tale bypass port at 10-15 PSI. 📌 Key Takeaways Water…
