Home » Mercruiser Engine Loosing Coolant?

My pre departure checks in the engine room showed me that the port engine closed cooling system required a coolant top up. This is a common occurrence on the boat and we had a similar experience on our last boat – the Sea Ray 400 Sedan Bridge. Both shared the identical engine setups, being 7.4 litre/454 cu. in. Mercruiser Bluewater’s.
I’ve never found any leaks or residual coolant around the engine or engine bay, so I’m thinking it’s just evaporation. Let me know if you’ve had a similar experience 👍

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