Closed cooling raw water side slow to drain
 

Guys,

https://cimg6.ibsrv.net/gimg/www.off...6a06a5bcf.jpeg

This started after the rebuild last winter. In days gone by, this draining finished before we were done wiping the boat down after putting it on the trailer. Now it drips for days. This was after about an hour after backing it into my shop, which was after a half hour drive from the lake. My suspicion is that it’s the drains in the bottom of the exhaust manifolds; not draining like they are supposed to. Does this ever happen?

For context, we did add some plumbing and water-containing volume to the fresh water side of the closed cooling system, but nothing that would I’d think would slow down the draining of the system like this.

Cooling is fine. Engine runs 140-150°, unless I’m running it hard (which hasn’t happened so far this year). Oil runs below 140° at idle, and 170-190°, depending on lake temp, until I stand on it.

Thanks. Brad.