Problem after HARD freeze- appreciate any input

[TXCruiser]

Ahoy! We survived the great Texas freeze of 2021 but our boat may not have been so lucky. We had a heater running aboard and it was in the water, not winterized since we intend to use year round. When we went back to check it, we warmed the engine compartment well and it cranked a bit then caught. Seemed to sound great until...we noticed water was being pumped into the engine bay and thick wet exhaust began spewing from the bay too. Video at https://drive.google.com/file/d/1_KZ...w?usp=drivesdk

Please feel free to give hunches or guesses, our mechanic is gung ho to come look at it but we want to work with him from a place of understanding. Also the bilge pump seems to just buzz and not pump water out..we had to bail with a bucket.

[Bacon]

Cracked exaust manifold?

[builderdude]

The steam & exhaust in the area of the exhaust elbow is where I’d focus. As Bacon suggested the exhaust manifolds will often crack during freezing temps if not drained/winterized. This can also be the case with the engine block. Hopefully you are part closed cooled and the block survived.
You may want to remove the spark plugs and crank the engine over to ensure water isn’t finding its way into the cylinders as well.

[fritzman]

Adding to Dave's comments drain the oil to see if there's water in the pan.

[Pcpete]

The video is a bit short and I would have liked it to look closer at the connecting hose. To my eye it looks like the source is at the aft end of the hose and not the manifold or riser. Did I see water dripping from the manifold from above the spark plugs?

[builderdude]

The video is a bit short and I would have liked it to look closer at the connecting hose. To my eye it looks like the source is at the aft end of the hose and not the manifold or riser. Did I see water dripping from the manifold from above the spark plugs?

That’s what I saw also. Water dripping from that area could be a failed manifold/elbow gasket or a crack in the manifold just below. I’d be concerned about water now running down the exhaust chamber into the cylinder.
As for the rubber exhaust hose leaking: that could be a possibility but typically there’s no standing water in that area that could freeze. Water will drain from the lowest outflow point at the exhaust elbow down to the static waterline.

[Pcpete]

That’s why I’m not sure what we are looking at.

[Metrodriver]

Holding the phone sideways (landscape) helps too

[builderdude]

Agree, Not the most detailed video