Boat Engine Cooling System Service, DIY Maintenance

In this episode, I tackle a full cooling system service on my boat engine — starting with the raw water (seawater) side, and finishing with the coolant system. What started as “just a quick visit” to the boat turned into: Replacing raw water hoses Flushing the seawater cooling circuit Replacing exhaust hoses Draining the coolant Emptying the water heater lines Refilling and topping up the cooling system All of this while working full-time and preparing for a work trip to Amsterdam. This is real boat ownership — not a marina fantasy. Things take time. Access is tight. Nothing is ever just five minutes. If you own a sailboat or powerboat with an inboard diesel engine, this is a real-world look at maintaining both sides of the cooling system: The raw water (sea) circuit The closed-loop coolant system Step by step. After work. Bit by bit. ⏱️ CHAPTERS 00:00 The plan: full cooling system service 01:04 Replacing raw water hoses 03:59 Flushing the seawater system 05:52 Exhaust hose replacement 11:15 First engine test – checking water flow 14:57 Draining the coolant 17:23 Emptying water heater lines 20:03 Refilling the cooling system 21:38 Quick interior trim replacement 22:49 What’s next: oil, diesel & belt 🔧 WHAT’S NEXT Engine oil change Diesel filter replacement Belt replacement Final engine run & coolant level check #BoatMaintenance #BoatEngine #MarineDiesel #RawWaterCooling #CoolingSystem #BoatLife #SailingLife #DIYBoat #ExhaustHose #EngineService #BoatOwnership Special thanks to Xavi Villanueva Join this channel to get access to perks: https://www.youtube.com/channel/UCFuWfLVgIBL6JzolbRqefXw/join