I have a Bayliner 4387 with twin gas Mercruisers. One is new (Starboard) and one rebuilt. I'm in the SF Bay area and a few months ago I was taking the boat out and I noticed the Starboard engine looked like it was running a little warm, but wasn't overheating while I was underway. As I got to a dock the temperature spiked up and the engine cut off. Not the best time for that but with no wind I was able to get her tied up. About an hour later I started her back up and we left for a spot to anchor and I noticed again, when the boat is moving, she runs on the warm side, but not in the red. Slow her down to close quarter speeds (1,000 rpm or less) and she overheats. We anchored overnight and the next day took her back home (3 hours away) and this time nothing happened at all...worked fine. I assumed the intake under the boat might be clogged a bit (although I have her scrubbed every quarter).
Fast forward to this weekend and took her out and as I was docking her once again she overheated and shut off.
So while moving above 1,000 rpm and maybe 3+ nautical miles per hour...she seems to get enough water to cool...
Any thoughts as to what this might be?
One thing that mystifies me is my coolant overflow tank is low...I fill it up a bit...and she ends up low again. Can't see any leak in the bilge so no idea what's up there.
Fast forward to this weekend and took her out and as I was docking her once again she overheated and shut off.
So while moving above 1,000 rpm and maybe 3+ nautical miles per hour...she seems to get enough water to cool...
Any thoughts as to what this might be?
One thing that mystifies me is my coolant overflow tank is low...I fill it up a bit...and she ends up low again. Can't see any leak in the bilge so no idea what's up there.
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