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Old 08-31-2018, 07:55 AM   #1
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Stop Solenoid question...

When stopping my port engine my solenoid continues to click when I am pushing the switch AFTER the engine stops. Clicking stops when I let go. It's never done that before and the starboard doesn't do it. Engine stops fine. Sign of the solenoid going bad? Anything in particular I should check?
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Old 08-31-2018, 08:14 AM   #2
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I suspect it clicks when the engine is coasting down to a stop, but you can't hear it then, right?

Put a voltmeter on the solenoid terminals and watch the voltage while it clicks. If it just varies a half volt or so then the wiring is probably ok and it is likely a solenoid problem. If it varies more, then the wiring probably has a bad connection which is letting the solenoid drop out and then try to pull back in causing the clicking sound.

Check all connections back to the stop switch and beyond for good voltage while holding the stop switch down.

David
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Old 08-31-2018, 08:22 AM   #3
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Thanks DJ, appreciate you giving some direction. I'm, um, electrically challenged. Among other things.
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Old 08-31-2018, 08:32 AM   #4
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Be sure to check and clean connections. Stop solenoids and any associated relays are notorious for dirty connections causing things like you described. Start simple and go from there.
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Old 08-31-2018, 09:23 AM   #5
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Also check to see if the solenoid has moved. Some are adjustable and if it moved to where the plunger cannot be pulled all the way in it can release and re engage (which sounds like what you are describing)
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Old 08-31-2018, 09:43 AM   #6
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Easiest and cheapest thing is to change out the relay that energizes the stop solenoid. They're automotive quality and available at auto parts stores.


Presuming, of course, that your system is anything like mine...
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Old 08-31-2018, 02:30 PM   #7
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You didn’t mention engine type. I have had bad luck with non OEM stop solenoids on our 6BT Cummins. Twice they failed in less than 6 months. The failure mode was the leaked back through the connection terminal.
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Old 08-31-2018, 04:05 PM   #8
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Dave:


Don't Cummins engines use an energize to run solenoid, not a stop solenoid?


David
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Old 08-31-2018, 04:13 PM   #9
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Quote:
Originally Posted by djmarchand View Post
Dave:


Don't Cummins engines use an energize to run solenoid, not a stop solenoid?


David
I don't know about all Cummins, but ours is energize to run.
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Old 08-31-2018, 07:25 PM   #10
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Thanks everyone. The solenoid is on a 1987 Ford Lehman SP135. Stop's the engine fine...just keeps on clicking until I let off the push switch.
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Old 09-01-2018, 07:27 AM   #11
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Quote:
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Dave:


Don't Cummins engines use an energize to run solenoid, not a stop solenoid?


David
There is an available "European option" which uses a stop solenoid and fuel is always on. At least that used to be the case.
The power on solenoids are different depending on which injection pump you have.
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Old 09-06-2018, 04:38 PM   #12
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It could also be the button.
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Old 09-06-2018, 05:23 PM   #13
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Thanks CEC, sort of laughing about it after reading your post....it very well could be. I know I'm not the only one who overlooks the possible simple solutions to things.
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Old 09-06-2018, 06:39 PM   #14
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Quote:
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Thanks everyone. The solenoid is on a 1987 Ford Lehman SP135. Stop's the engine fine...just keeps on clicking until I let off the push switch.
When you say it keeps on clicking do you mean you hold the switch down continually and the solenoid clicks multiple times?

Ken
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Old 09-06-2018, 06:43 PM   #15
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Yes it could be the weitch itself. I had a stop switch go bad.
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Old 09-07-2018, 04:40 AM   #16
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When you say it keeps on clicking do you mean you hold the switch down continually and the solenoid clicks multiple times?

Ken
Yes, it continues clicking after the engine stops as long as I am holding the push switch in. Starboard side does not.
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Old 09-07-2018, 06:23 AM   #17
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Yes, it continues clicking after the engine stops as long as I am holding the push switch in. Starboard side does not.
Ok. It should click only once when you push the button. The relay and the solenoid should stay energized the whole time you hold the button. If you have a normal Lehman setup there should be a relay that gets energized by the button which in turn energizes the stop solenoid. Although I suppose it's possible you have a direct from switch to solenoid setup - it is not the best setup.

The solenoid itself (which is what actually pulls the stop lever) doesn't make much noise so I'm guessing you're hearing the relay clicking. I think you have either a bad relay or poor connections to it. When it switches the current to the solenoid the voltage drops too low to hold the relay and it releases. When it releases the voltage goes back up and causes it to pull back in and the cycle repeats. One thing going for you is you have twins so you can compare. And you can try it while the engine isn't running so you can see and meter what's happening.

Ken
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Old 09-07-2018, 10:51 AM   #18
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When my button went bad it was from vibration I believe. The nut wiggled loose a bit and the soldered connections on the back were wiggled loose. Simply touching the button a little would cause the clicking noise. Any arcing connection could cause the relay to fire off and on. I started using the anti-vibration liquid on the threads for things like the linkage and screws that connect the wires. Its almost on everything that gets loose or rattles right now and its helping a lot - from the windshield screws, Bimini screws, some rail connection screws ext.. I'm using that blue stuff that you let dry on the threads before screwing back on.. Anyways, I hope you get it resolved and at least the parts are not too expensive for this one.. Good luck!
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Old 09-17-2018, 01:01 PM   #19
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Yes, it depends on which fuel pump is installed. I think the multi-piston (like Bosch) pumps have stop solenoids and ones like mine with the Lucas CAV pump us "run" solenoids. Which brings up a question of mine. I noticed that the original stop lever is still there. I want to eliminate the run solenoid and replace it with a pull cable, like in the old days. Is there a quick and easy way to disable the run solenoid? With a run solenoid if you lose electrics the engine shuts off. Happened to me once and I don't like it. Any suggestions?
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Old 09-17-2018, 09:11 PM   #20
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Unrelated except that it happened to me on my 1972 Grand Banks. When somebody mentioned a stuck button, I was reminded of my issues with STARTER buttons. One stuck in 2012 and burned up a stater. I replaced all four of them (flybridge and lower helm).
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