Yanmar 4JH4-E Oil Leak? Raw Water Pump Gasket Replacement (Step-by-Step NOT DIY)

Have you discovered oil under your Yanmar engine, especially around the raw water pump? That's exactly what happened on our Yanmar 4JH4-E. We noticed an oil leak beneath the engine on the raw water pump side and traced it to the raw water pump gasket. In this detailed DIY (NOT) tutorial, I show every step of replacing the gasket, inspecting the impeller, and dealing with one of the trickiest parts of the job - removing the timing belt. I deliberately filmed the repair slowly so you can clearly see each step if you're doing this maintenance yourself. The best part? After completing the repair, we put it to the test during our sailing trip aboard Indara, our Najad 380. ✅ More than 60 engine hours later, the engine remains completely dry with no leaks whatsoever. Engine & Parts Engine: Yanmar 4JH4-E Component: Raw Water Pump Pump Model: (Johnson: 10-13328-03 ) If this video helps you diagnose or fix an oil leak on your Yanmar engine, please give it a 👍 and subscribe to Seahoppers for more sailing adventures, boat maintenance, and practical DIY repairs.