Stagger
Member
- Jul 30, 2020
- 60
- Boat Info
- 260 Sundancer 2003
- Engines
- 5.7L Mercruiser 350 Mag MPI Bravo III
My Engine is a Mercruiser 350 Mag MPI. I have a raw seawater pump that is leaking, the new one just got delivered today. Previous to yesterday I had not had any overheating issues. Took the boat out yesterday, the overheat alarm went off i anchored and let it cool for several hours. I started it back up, and tried to bring it back home. It did fine at speed, temp was a little high but no alarm was going off and temps were staying consistent..... Until i got to the no wake channel between the lake and the bay. Once i lowered my speed, the overheat alarm went off immediately. I could not kill the engine, as I was in a thin channel with rock walls on either side and a ton of boat traffic. In retrospect I should have backed out of it, and waited for a tow, but i didnt. So I went through the channel, and limped the boat maybe a half mile to a safe spot in the bay to anchor in the dark and wait for the engine to cool. After several hours of waiting, i tried to start the boat, and it wouldnt turn over. It felt like it was the battery, it sounded like it was trying to turn over but just didnt have enough power. So I called out a friend with a jump box, and tried again. Same result, either nothing or it sounded like it was almost going to turn over and didnt. Still thinking (hoping!) it was the battery, I got towed in and hooked to shore power for the night. Tried again this morning, same result. I was exhausted today as i didnt get to my slip until 4am last night waiting for the tow, so i didnt do any troubleshooting. Tomorrow or tuesday I plan in pulling the plugs and taking a look at the cylinders. What are the possible causes for this? Possible repairs? Has anyone else experienced this? Im really hoping that its something that can be easily repaired and not catastrophic engine failure. This is my first boat, and I have only owned it for about 6 weeks so Im still learning. Thank You