Anti-freeze Leak

Sounds like you blew a head gasket

 

To come out the overflow tank like that likely means an overheat condition actually caused the hose to blow, versus the other way around. The radiator cap will hold back ‘normal’ pressure, I think it’s around 15psi.

Did you notice how how the engine got before the smoke started?

 

+1 on this.

While it is normal to have expansion over flow and then when the engine cools it sucks it back in. When there is excessive boil over that is usually cause by a blown head gasket. Be careful in trying to restart that engine, if there is anti freeze in the cylinder then running the engine could bend a connecting rod and then your in for a rebuild of at least that cylinder if not the whole thing.

 

Curious to learn how the OP will diagnose this.

 

I'm with @scoflaw on this. That the overflow line (that usually has little to no pressure) ruptured seems to me to be caused by a very large/instantaneous increase in the cooling system pressure. That in combination with loss of power with black and white smoke would lead me to think head gasket as well.

I think I would get in touch with the local CAT mechanic and get a good diagnosis. The first order of business is to do no further harm. While not cheap, a new head gasket and resetting the head (I'm assuming that will need to be done), wont to too bad, as long as nothing else gets bent/broken.

 

Pressure test the cooling system.

 

The over flow line burst at the first restriction because the antifreeze was super heated and exiting so fast that the tygon tubing just burst when it lost it's rigidity from the heat.

In my opinion the injectors need to be pulled and a leak down test performed to see exactly what is going on. Pressure testing the cooling system may make it worse by injecting (more?) antifreeze into the cylinder(s). The cylinder leak down test or even a compression test after the engine has been turned over with a breaker bar insuring no antifreeze is in the cylinders. That will tell the condition of the cylinders and possibly where the leak is before the head is removed. Also a bore scope can be used with the injectors out to help determine the state of the engine. Just my experience with these things.

 

Not a mechanic but please do not try to restart that motor until you find out what happened.

 

keep us posted! Hopefully at worst it’s an R&R of the head and rerunning the overhead.

 

First of all, congratulations, and how did you get a diesel mechanic out there so quickly. Second of all, that's the easier engine of the two to get access to so congrats, and go ahead and replace the starboard one it's going to fail eventually. And if your mechanic hasn't done so, start pulling things apart looking for impeller bits that will lodge and cause continued heating issues. I spent almost 4 months this past season chasing this down. Especially where the raw water goes into the HEX. That's where my bits lodged.

http://www.clubsearay.com/index.php...ting-running-hot-after-sucking-up-mud.110441/

Specifically, http://www.clubsearay.com/index.php...ter-sucking-up-mud.110441/page-7#post-1352034

 

wow, that's the best possible outcome. A couple questions/observations:

• I don't think the pressure caused the hose to leak, that overflow hose isn't designed to take that volume of overheated anitfreeze so instead your cooling system overcame the pressure cap on the overflow tank and fired hot antifeeze into the hose causing it to burst. Semantics really, the outcome is as you described: pressurized cooling system from the overheat
• This part I'm not sure on since I haven't removed our injectors but -- it's possible the overhead and injection timing dimension need to be adjusted now that the injectors are re-installed. Do you know if the mechanic did that?

 

Yep, I think so. Something about new seat's are in order also? Still learning. @fwebster

 

injector cups, yes. I’d imagine those were replaced when the injectors were reinstalled or there would be lots of combustion gasses leaking past the seal but worth asking, for sure

 

I'm jealous you were able to get a diesel mechanic to your boat so quick, takes months here, and even then they ghost you.

 

Maybe...

Make sure they check for impeller bits throughout your system, that's what got me even after I replaced my impellers when the engines overheated. They ran hot after the event. Read thru the post I referenced.