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In over our heads, but learning....

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In over our heads, but learning....

Old 10-21-2019, 08:11 AM
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Default In over our heads, but learning....

So my buddy has a 52 ft 1990 Hatteras with Detroit Diesels 8V92. We went out for a short cruise Sat. and had a couple issues. While operating we notice the starboard engine was starting to run hot. The Port was running at around 150-160 degrees, and the Starboard got up to 200, manual states operating temp range between 150-190 is normal, so we cut the engine. After cutting the engine, the temp increased to around 230 and then slowly came down after about 30 minutes. Once down in the engine room we notice that the radiator cap came off and most of the fluid leaked out. We refilled the reservoir with water (could not locate the cap) and only turned the engine back on to dock the boat. Once we turned it back on the temp went down immediately from 190 to 150. The engine ran normal and we docked the boat. Then the next problem.....

We could not turn off the engine. Neither the shutoff at helm or in the engine room was responsive. With no cap on the radiator, I was concerned that the engine was going to over heat, I know there is probably a way to starve the engine from air, but I didn't have time to figure it out, so we turned off the fuel, after about 10 minutes it sputter off.

Now with antifreeze topped off and a new radiator cap, we can't start the engine. There is a fuel priming pump which makes noise, but honestly doesn't sound that good, and like everything on a 30 yr old boat you wonder if your doing something wrong, or if that something is broken.

so with the back ground laid out here are my questions.

1) Do you think the overheating damaged the engine?
2) How do you starve one of these engines of air?
3) How do you reprime the fuel system?
4) Why didn't the kill switch work?
5) Besides the obvious of not checking the radiator cap, what did we do wrong or should have done differently.

Thanks

P.S. I think this was a yacht in the 90's not sure what to call it now
Old 10-21-2019, 08:37 AM
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Hello, The engine is probably fine you didn't get it too hot, there is air in fuel lines where you run it dry, must crack fuel injector lines and run priming pump until fuel comes out, close lines and try to start. May need a small squirt of ether in air filter to get it running but never spray unless engine is turning and only in small amounts!!!!!!! Kill switch is small electric valve so it is probably just gone bad, may be able to clean it out and get it to work. Jim
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Old 10-21-2019, 09:52 AM
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Yep - You couldn't hurt that engine with a sledge hammer.

Diesels have a fuel pump that pressurizes the fuel system to the point an mechanical injector will "pop" open. If you get air in the lines (by running out of fuel) you will need to purge all of the air before the engine will run again.

YouTube "bleed diesel fuel lines" or diesel bleeding or any combo like that to learn how to do it. Really simple - but takes some time.

NEVER run a diesel out of fuel - its a pain in the ass to prime the pump again.
Old 10-21-2019, 09:53 AM
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As far as it running warm - popping a cap will do it. You may not have any other issues at all now that you have a new radiator cap.
Old 10-21-2019, 04:19 PM
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Sounds like you have a electrical issue. It wouldn't shut off with the key, wouldn't start with the key. The engine sounds fine. I'd be checking grounds and ignition parts.
Old 10-21-2019, 04:30 PM
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unless you really know what your doing, I wouldn't reccomend spraying ether in to get it started

Old 10-21-2019, 04:31 PM
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Originally Posted by Codycat View Post
unless you really know what your doing, I wouldn't reccomend spraying ether in to get it started
But u have been given good advice so far
Old 10-21-2019, 04:46 PM
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X2 on what CC says-

DO not spray ether into it, the chances of damaging a cylinder sleeve are great... The one way to kill a DD is to over heat it, but from what you have said it does not sound like you did that.
As others have said you need to purge the air out of the system. The mechanical pumps will not pull fuel from the tank. Check you secondary filters to see if they ran dry. You may have to open it up and fill it.
You can manually pull the rack closed to shut down the motor. There should be dampers on the air intakes that shut it down in an emergency. I suggest you find those ASAP.. Post a few pictures and we can point them out. I should have asked- are these DDECs or mechanical engines?

if your stop button is not working then is could be a solenoid not pulling the rack in. check for power to the solenoid.
Old 10-21-2019, 04:56 PM
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Loosen an injector coming from the fuel pump side (if you loosen the return side it doesn't work) use the pump till you get fuel try to start you might have to do that to several injectors before it will start.
If you run them dry some times it takes some doing to start.
You didn't hurt the engine just made it hard to get running again.
Old 10-21-2019, 05:03 PM
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Originally Posted by 95vette View Post
Hello, The engine is probably fine you didn't get it too hot, there is air in fuel lines where you run it dry, must crack fuel injector lines and run priming pump until fuel comes out, close lines and try to start. May need a small squirt of ether in air filter to get it running but never spray unless engine is turning and only in small amounts!!!!!!! Kill switch is small electric valve so it is probably just gone bad, may be able to clean it out and get it to work. Jim
^^This^^
Also, the advice on topping off filters (MAKE SURE CLEAN FUEL) and cracking the last injector are spot on

Use the ether sparingly and you'll be fine
Crank - spray 1 second at a time
When it starts you might have to give it a TINY squirt to keep it running

Sounds like you did fine
Old 10-21-2019, 05:06 PM
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shut down solenoid went bad on one of my old Detroits. You can push the the rod in by hand to shut it off if you know where to look, much better that running it out of fuel and then having to re prime the system.
Old 10-21-2019, 05:12 PM
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Running the engine out of fuel aside, that's one hell of a boat to learn on!
Old 10-21-2019, 05:34 PM
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Originally Posted by PRO-BLU View Post
Sounds like you have a electrical issue. It wouldn't shut off with the key, wouldn't start with the key. The engine sounds fine. I'd be checking grounds and ignition parts.
Ignition parts?
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Old 10-21-2019, 05:40 PM
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I used to have a sport fish with twin 671's and the only way to shut them down was to pull a ring attached to a wire which was attached to the air intake. You had to go down into the main salon to shut them down.
Old 10-21-2019, 06:12 PM
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Originally Posted by Gary999 View Post
Ignition parts?

Yep. Check dwell on the points.
Old 10-21-2019, 06:23 PM
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Originally Posted by carbo View Post
Yep. Check dwell on the points.

Don't forget the condenser
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Old 10-21-2019, 06:43 PM
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As the others said above make sure both the primary and secondary filters are full first! The injector lines are a bitch to get to on these( under the valve cover). They are self bleeding injectors, as long as you have fuel in the rail they will eventually start. The shut down solenoid is on top of the motor on the front side in the middle of the V (at least on mine they are) very close to the radiator cap! It probably got drenched in antifreeze. They do go bad and are easy to replace. A lot of the 92's don't have emergency shut down levers (tee handles on the bridge) that close a damper at the blower. I guess the thought was the govenor spring can overcome the rack in a run away situation. Not ideal but, I kind of wish I had them! Good Luck!
Old 10-22-2019, 01:15 PM
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Thanks everyone for responding. I went over there last night to help out again, but no luck. We filled up the filters. There are two Racors and then the fuel priming pump which fills the filter up high on the engine. We checked the priming pump and its got very good flow, I opened one of the fuel line coming off the last filter before it heads into injectors and had good flow up there. Still no luck, held the fuel priming pump on for at least 1 minute and still no start. I got different opinions on not using any starting fluid, so we decided against it. The internet suggested finding the fuel return line and hooking up a vacuum pump to suck out the air. Think we figured which was the fuel return, but we could not get the union off, and not wanting to break anything we decided to have his diesel mechanic come out next week to take a look, just don't want to guess on something and make it worse. As for the shutoff, yes we have 2 "T" handle pulls up on the bridge that would have shut off the engines, they are the same style pulls that are near the engine room for the Halon fire system, and we mistakenly thought these were also for the fire system. Live and learn. I do believe the Shutoff must have gotten wet and not been working with water spashing on it, it is right behind the radiator cap. I wish I took some pics because I think I understand the shutoff system but it is a little peculiar. I will take some pics next time I'm at the boat. Thanks again and I will report back on the resolution.

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