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Old 07-06-2012, 17:27   #1
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My Yanmar diesel wont turn off with the stop switch HELP

What is the best way to stop it and get it started later thanks. Jim
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Old 07-06-2012, 17:54   #2
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Re: My Yanmar diesel wont turn off with the stop switch HELP

Not sure about your specific engine, but you should be able to reach the fuel cable and pull it all the way off. That may shut it off or may just leave you at idle. I have heard you can restrict the air flow with something solid like a flat piece of board. (with the air in let off the engine) DO Not try it with your hand or a rag etc. If the stop switch activates a solenoid, just pull there.
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Old 07-06-2012, 18:45   #3
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Re: My Yanmar diesel wont turn off with the stop switch HELP

Go to the engine and find the throttle linkage and move it to lower RPM's and then all the way in that direction which should stop the engine. And if that happens your problem is in the stop switch, or the linkage to the throttle.

What is the model #?
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Old 07-06-2012, 19:17   #4
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Re: My Yanmar diesel wont turn off with the stop switch HELP

You might have a problem with your electric kill switch. Probably just a loose wire to the solenoid.

Have you located the manual kill switch ? That will do just fine while you figure out the electrical problem. If access is difficult tie some string to the manual switch and pull on the string.

Crude but effective.
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Old 07-06-2012, 19:25   #5
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Re: My Yanmar diesel wont turn off with the stop switch HELP

Cut off the air intake as noted. All of the other suggestions are good and if you are lucky, its one of them. The worst possibility is that the diesel is running on your crankcase oil.
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Old 07-06-2012, 19:25   #6
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Re: My Yanmar diesel wont turn off with the stop switch HELP

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Originally Posted by Panamajames View Post
What is the best way to stop it and get it started later thanks. Jim

Depends on the model. My old one had a lever near the front. If you pulled it forward, it cut the fuel off manually.

On my new engine (20 hp 3gm, fresh water cooled), there's a button at the back of the engine you push. Check your manual.
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Old 07-06-2012, 20:12   #7
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Re: My Yanmar diesel wont turn off with the stop switch HELP

My 3GM30 has the kill lever on the lower forward left hand side as you are facing the front of the engine. If you have a cable kill system, have someone pull the cable and see if it is moving the lever of the kill switch. If not, either move it manually as they pull on the kill cable or loosen the cable attachment bolt and use your foot or hand to move it aft IIRC. If that doesn't kill the engine, you are getting combustible material into the engine other than from the injectors and probably have significant wear problems.

If the above doesn't work, take a board or something and put it over the intake to cut the air to the engine. In no circumstances put your hand or any part of your body over the intake while it's running.

Once you release the kill lever, the engine will be ready to run again.
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Old 08-06-2012, 04:57   #8
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Re: My Yanmar diesel wont turn off with the stop switch HELP

your stop solenoid isn't working, find it and manually pull on the linkage for the fuel dump attached to it (stbd side of engine by the fuel pump), plan on replacing the soleniod, the wiring or the push button as one of these is the problem

if problem is that the stop solenoid isn't energizing, it won't stop you from restarting the engine later

Check your engine panel push button to see if works, if it does check that the solenoid energizes

I've recently replaced both of my engine push buttons and your boat is older than mine
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Old 08-06-2012, 05:17   #9
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Re: My Yanmar diesel wont turn off with the stop switch HELP

It is very common for the wires behind the red kill button to suffer salt damage. Few boats offer the ignition panel as much water protection as it needs.

My Yanmar red kill button is dead even as I type. Fortunately there is a piece of string strategically placed beneath one of my cockpit seats.

Yeah yeah, it's on the list.
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Old 14-02-2015, 18:36   #10
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Re: My Yanmar diesel wont turn off with the stop switch HELP

I recently tried to shut off my engine via the fuel shut off cable that appears to cut fuel supply right at the tank. The trouble is the engine just kept on running. My shut off on the control panel works fine; I was just experimenting. You would think turning the fuel at the tank would do it but it didn't. The stop solenoid on the back of the engine works.

Any ideas?
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Old 15-02-2015, 00:54   #11
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Re: My Yanmar diesel wont turn off with the stop switch HELP

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Originally Posted by scottthardin View Post
I recently tried to shut off my engine via the fuel shut off cable that appears to cut fuel supply right at the tank. The trouble is the engine just kept on running. My shut off on the control panel works fine; I was just experimenting. You would think turning the fuel at the tank would do it but it didn't. The stop solenoid on the back of the engine works.

Any ideas?
A book or a board over the air intake in emergencies. Otherwise, check the linkage, and maybe you can get it to work properly. Try to adjust play out of it, and slack.

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Old 15-02-2015, 21:13   #12
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Re: My Yanmar diesel wont turn off with the stop switch HELP

As above, block the air intake. If you can't otherwise find the problem, Diesels are known to run on by burning the oil in the crank case. Usually means the rings are gone or other really bad stuff. Hope its not so.
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Old 25-02-2015, 22:29   #13
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Re: My Yanmar diesel wont turn off with the stop switch HELP

Well it does that a while for fuel starvation to occur.
Your fuel pump will suck a vacuum eventually, and run out of fuel.
But with filters and lines it can take 10 mins.
If you add a suction gauge inline to your filter or line you'll see the gradual suction form.


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Old 25-02-2015, 23:07   #14
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Re: My Yanmar diesel wont turn off with the stop switch HELP

Quote:
Originally Posted by scottthardin View Post
I recently tried to shut off my engine via the fuel shut off cable that appears to cut fuel supply right at the tank. The trouble is the engine just kept on running. My shut off on the control panel works fine; I was just experimenting. You would think turning the fuel at the tank would do it but it didn't. The stop solenoid on the back of the engine works.

Any ideas?
Basically Repeating BoatYardDog, my engine took about 10 minutes to die when I forgot to open the tank fuel shutoff valve once.
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Old 26-02-2015, 04:32   #15
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Re: My Yanmar diesel wont turn off with the stop switch HELP

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Originally Posted by Panamajames View Post
What is the best way to stop it and get it started later thanks. Jim
So, I am kind of curious... is it running while you typed this...

Oh, hang on, original post in 2012. Fuel probably ran out by now.

Matt
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