Throttle question ... should _I_ have to control idle myself? - SailNet Community

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Go Back   SailNet Community > On Board > Gear & Maintenance > Engines > Diesel
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Old 02-15-2010
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Throttle question ... should _I_ have to control idle myself?

I have an 81 C&C 32 with an original Yanmar 2GM. It previously had a very old style (since discontinued) throttle control style at the pedestal. I have since upgraded a new Edson 2 lever (transmission lever on the front, throttle on the stbd side).

Currently, in order to start it and keep it running, I have to set the throttle position high enough to start and maintain RPMs. The kill switch on the Yanmar panel does not work so I stop the engine by throttling all the way down.

Should this old engine be able to maintain it's own idle? Should I shorten the throttle cable enough to keep it idling at the lowest throttle position? Is this just the way these mechanical diesels are operated?

Thanks!
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Old 02-15-2010
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That is normal in an arrangement without a kill switch. My Yanmar has never had a kill switch and my Volvo in the past didn't either. I'd leave it as is.
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Old 02-15-2010
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From the injection pump's point of view, you can keep throttling it down until you don't deliver any fuel. It won't hurt anything to allow to happen, it will just shut down the engine. If your kill switch does not work, it is necessary to be able to throttle below idle to kill the engine.

In an ideal world, you have a kill switch and the idle adjusted on the engine so that it will not stall. As you can imagine, it is a real pain to stall the engine at an inopportune time due to throttling down too far. The vast majority of engines have an idle screw on the side of the injection pump which is essentially a throttle stop on the low end. A few engines require it to be adjusted using the throttle cable. Honestly, I can't remember how the 2GM is setup, someone on here can probably tell you. If you decide to set it up so that it will not stall (this is a personal preference thing, not critical), make sure that you have the shutdown operating first.
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Old 02-19-2010
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one could fabricate a "stop" that hinges in such a way to keep the throttle lever up at idle position, flipping it out of the way to shut down. Not a perfect solution but it will work, good fortune,
Dumah

Last edited by Dumah; 02-19-2010 at 02:57 PM. Reason: missed puncuation
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Old 02-19-2010
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Just curious, if you modified this, how were you planning on stopping the engine???

Leave it alone, it ain't broke so don't try to fix it.
Quote:
Originally Posted by scraph View Post
I have an 81 C&C 32 with an original Yanmar 2GM. It previously had a very old style (since discontinued) throttle control style at the pedestal. I have since upgraded a new Edson 2 lever (transmission lever on the front, throttle on the stbd side).

Currently, in order to start it and keep it running, I have to set the throttle position high enough to start and maintain RPMs. The kill switch on the Yanmar panel does not work so I stop the engine by throttling all the way down.

Should this old engine be able to maintain it's own idle? Should I shorten the throttle cable enough to keep it idling at the lowest throttle position? Is this just the way these mechanical diesels are operated?

Thanks!
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Old 02-21-2010
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Some off road equipment notably Caterpiller and Zetor use a spring loaded stop for the throttle. Pull it past the stop and the engine quits.

You could do something like that or else make a detent plate kind of like the plate that keeps you from grabbing the wrong gear in your automatic transmission equipped car.

Its very annoying, and possibly expensive, when your motor quits just when you need reverse to come alongside the dock.
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