Thanks for all the info, as it turns out it was coolant mixing with belt dust. Looks like the problem is an over-tensioned belt that has damaged the shaft seal on the coolant pump. I’ll be fixing that as well as the alternator alignment this winter.
Sunchaser - engine is a 3.3, marinized by Trans Atlantic Diesels in VA. Backstory is that PO installed it soon after he purchased the boat but then spent most of the following years on a long of repairs and improvements, getting the boat ready for a Great Loop trip. Other positive happenings in his life took him in a different direction and he decided to sell.
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