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Old 25-05-2014, 17:54   #1
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Yanmar 2QM15 Throttle

This may be a really dumb question but I am in the process of installing a 2QM15 in place of the original Atomic 4. I now have the engine in and I'm hooking up the throttle cable. The throttle on the engine must have an internal spring attached to it which moves the throttle back toward idle when you let it go. I haven't had the engine running yet but is this internal spring some sort of a governor. I don't want to have to keep my hand on the throttle while motoring in order to keep up rpm. It seems that as soon as I release the throttle lever it will go back to idle. Am I missing something here. Thanks
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Old 25-05-2014, 19:34   #2
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Re: Yanmar 2QM15 Throttle

Somebody at Yanmar thinks that if you have a throttle control failure, you want the engine to return to idle. The friction in your control will deal with the creep.
If they had any balls, you would want it to go to full open.
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Old 25-05-2014, 21:08   #3
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Re: Yanmar 2QM15 Throttle

Here is a picture of the governor arrangement. Cable friction should keep the throttle open. If it doesn't install a cable brake.

Click image for larger version

Name:	<a title=2QM15 governor.jpg Views: 577 Size: 23.9 KB ID: 81897" style="margin: 2px" />
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Old 26-05-2014, 08:24   #4
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Re: Yanmar 2QM15 Throttle

I've connected the cable and there isn't anywhere near enough friction to prevent the governor from going back to idle. Where would I find a cable brake and what does it look like. I know there is no friction adjustment on the pedestal control.
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Old 26-05-2014, 08:36   #5
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Re: Yanmar 2QM15 Throttle

I think I found one on ebay. Its just a U shaped bracket with a tightening bolt which crushes the cable enough to provide fiction. Kind of a mickey mouse way of doing it I guess but if it works what the hell.
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Old 26-05-2014, 09:28   #6
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Re: Yanmar 2QM15 Throttle

Quote:
Originally Posted by weephee View Post
I think I found one on ebay. Its just a U shaped bracket with a tightening bolt which crushes the cable enough to provide fiction. Kind of a mickey mouse way of doing it I guess but if it works what the hell.
Search results for: 'cable brake'


Click image for larger version

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It is simple (which isn't the same as "mickey mouse" which to me means a poor/ ineffective/half-as*ed solution...which this is not). It is effective and robust.

Don't crush your cable. Tighten the brake in increments a bit at a time until you like the feel of your throttle control.
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Old 26-05-2014, 10:11   #7
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Re: Yanmar 2QM15 Throttle

BTW that cable brake photo I posted above shows the brake improperly assembled...it should be installed like this...

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Name:	Cable brake.jpg
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...which is much less likely to damage your cable.
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Old 26-05-2014, 11:28   #8
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Re: Yanmar 2QM15 Throttle

Thanks for the replies. Sorry, I didn't mean to be insensitive when I called it mickey mouse. I have ordered one. The info I have on it says it must be attached at the source ie the lever. There is no room inside the pedestal so I hope it's OK to attach where the cable comes out the bottom of the pedestal. It would also be easier access wise to adjust it at that location.
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Old 26-05-2014, 16:28   #9
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Re: Yanmar 2QM15 Throttle

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Originally Posted by weephee View Post
Thanks for the replies. Sorry, I didn't mean to be insensitive when I called it mickey mouse. I have ordered one. The info I have on it says it must be attached at the source ie the lever. There is no room inside the pedestal so I hope it's OK to attach where the cable comes out the bottom of the pedestal. It would also be easier access wise to adjust it at that location.
Those instructions simply mean to install near the throttle control lever rather than near the governor. Put it in a place near the throttle lever where it is easy to access for adjustment.
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