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Go Back   SailNet Community > On Board > Gear & Maintenance > Engines > Diesel > Partner shut off key on overnight run now engine won't run...
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Diesel This is a forum dedicated to diesel engines and their applicable accessories.


Thread: Partner shut off key on overnight run now engine won't run... Reply to Thread
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Topic Review (Newest First)
4 Weeks Ago 09:03 PM
SJ34
Re: Partner shut off key on overnight run now engine won't run...

I'm coming to the party late and I haven't read all the posts.

The first thing that caught my attention was "The engine ran 6hrs with the key off"... that probably blew the diodes in the alternator.

Secondly, repeated attempts to start the engine with the raw water pump working away and the engine exhaust not clearing all that water may have flooded the cylinders, causing a hydrolock at the least, or worst case, enough corrosion to ruin the pistons, rings or cylinders.
10-07-2014 04:10 PM
aa3jy
Re: Partner shut off key on overnight run now engine won't run...

I'd take a peek inside the original to see if water didn't encroach into the cylinders from some where like a blown head gasket,cracked manifold,etc.
10-07-2014 03:39 PM
JRickW
Re: Partner shut off key on overnight run now engine won't run...

I will be investigating when I pull the old motor. My best theory is that I lost oil pressure (the oil was very low) and with the key off there was no indication.
10-07-2014 02:08 PM
Minnewaska
Re: Partner shut off key on overnight run now engine won't run...

Good luck with the new motor.

I would certainly want to know what caused it to seize, which would not strictly be a symptom of age. Otherwise, one may be doomed to repeat history.
10-07-2014 11:34 AM
JRickW
Re: Partner shut off key on overnight run now engine won't run...

Final update...

It wasn't fuel, intake, or exhaust. It is something internal. While working on it, the engine finally seized! So, since my engine has 37 years of salt-water cooling I have decided not to rebuild it. I bought a replacement from Chicago and I am overhauling it in my garage now before installing it in my boat. Being a fresh-water engine, it looks new.

Thanks for all the help.
09-01-2014 07:43 PM
Tempest
Re: Partner shut off key on overnight run now engine won't run...

For 6 hours, the electric fuel pump was off and the engine ran. So that means that the injector pump was handling the job. I would look there, as Capt Len and others have suggested...then move to the injector....

But 1st:
You've also had everything opened up numerous times, Do you do a thorough job of bleeding every time? Residual air. ? let it bleed..
09-01-2014 07:15 PM
MarkofSeaLife
Re: Partner shut off key on overnight run now engine won't run...

A big fat barnacle will do the same thing.
09-01-2014 03:50 PM
TakeFive
Re: Partner shut off key on overnight run now engine won't run...

Quote:
Originally Posted by Minnewaska View Post
...It is incredibly common for a prior owner to bang up a prop and replace it incorrectly.
Funny how we only hear about prior owners doing that.
09-01-2014 03:40 PM
Minnewaska
Re: Partner shut off key on overnight run now engine won't run...

I've promised not to beat a dead horse with my estimate of your problem. But you are getting closer to believing it.

As for props, an improper pitch can put the motor under too much strain, which affects combustion. You wouldn't notice it at the dock for some time, but under way you may be coking up the innards. I'm sticking with my first answer above, but there is a simple test for prop pitch. Look up the max rpm for your motor. Take her off the dock and run her for 15 seconds at wide open throttle. It should hit that max rpm +\- 100rpm to account for tach error. If not, you have the wrong prop. It is incredibly common for a prior owner to bang up a prop and replace it incorrectly.
09-01-2014 11:56 AM
MedSailor
Re: Partner shut off key on overnight run now engine won't run...

Quote:
Originally Posted by JRickW View Post
That is what I thought too. But this is under no load. Starting in neutral. It could be the soot is because I have done a lot of start attempts and it has never run long enough to get up to temperature. Still think it is fuel related.
Are you certain of the quality of the last batch of fuel you took aboard? You could try running the engine from a jerry can of fresh fuel.

MedSailor
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