Elusive coolant leak in Yanmar 2QM20

[partingclouds]

I would like to find the source of a small leak which has me baffled. After a five-hour run on the motor, there's about a pint of coolant in the bilge beneath the beast. All hoses are new, and clamps have been tightened and retightened.
Still a drip coming from somewhere. Any ideas?

[Bleemus]

Try one of these . . .

[Uncle Bob]

Originally Posted by Bleemus

Try one of these . . .Attachment 179654

+1. Paper towel laid on the bilge floor under the engine will also show up the general location.

[Aloha_float]

https://youtu.be/Tbbbt-1euj8

[Aloha_float]

Check seals for any potential leakage. This guy goes through his engine cooling system to give you some ideas. I think this one is a volvo but I think it will be helpful to you.