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Old 26-04-2014, 03:43   #1
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Idling too fast

The idling on our Yanmar 3gm30f has suddenly increased to 1.600rpm when starting the engine with the handle In idle position. The handle has also become harder to push in forward position and now needs to be pushed to 90 degrees to achieve full speed

How do I adjust this on the screw on the cable Click image for larger version

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Old 26-04-2014, 05:24   #2
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Re: Idling too fast

The problem does not sound like an idle screw misadjustment, it sounds like a throttle linkage failure.
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Old 26-04-2014, 05:38   #3
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Re: Idling too fast

sounds like time for a new cable!
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Old 26-04-2014, 06:25   #4
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Unhook the cable at the engine and see if the idle returns to normal that will tell you if have a stuck cable
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Old 26-04-2014, 13:09   #5
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Re: Idling too fast

Will I need to start the engine after unhooking the cable ?
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Old 26-04-2014, 13:16   #6
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Re: Idling too fast

Kinda difficult to check the idle speed if the engine's not running lol.

I would start the engine after disconnecting the throttle cable.
I assume your engine shutoff does not have some arcane connection to the throttle cable.
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Old 26-04-2014, 13:19   #7
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Re: Idling too fast

Yeah but why would engine go to idle when the cable us unhooked ?
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Old 26-04-2014, 13:19   #8
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Re: Idling too fast

Of course you will have to start it to see if its still idling too high. Good luck.
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Old 26-04-2014, 13:21   #9
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Re: Idling too fast

Will the engine seek to idle when running without the cable ?
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Old 26-04-2014, 13:32   #10
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Re: Idling too fast

As long as there is a return spring on the injector pump. Just disconnect the cable at the pump and see if the throttle returns after accelerating. If not, you'll need someone holding it to idle so it doesn't over rev. There should be a spring.
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Old 26-04-2014, 14:29   #11
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Re: Idling too fast

Quote:
Originally Posted by carlager View Post
Yeah but why would engine go to idle when the cable us unhooked ?
LMAO.
The best you can hope for from CF is "how". Please don't ask us for "why".
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Old 26-04-2014, 14:36   #12
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Idling too fast

Greg,

See what you mean,

The cable is hooked on a lever on the engine.

When unhooked the engine should be running in idle at normal (i.e 1.000rpm). If it runs higher something is blocking the lever.
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Old 28-04-2014, 04:43   #13
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Idling too fast

The lever (throttle shaft) on the engine is hard to move to idle position caused by a water leak from the seawater hose above the shaft area.

Being a newbie on this I will have a Pro clean and lubricate the lever and fix the water leak


Thanx a lot to everybody for helping with this
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Old 28-04-2014, 06:15   #14
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I'm glad you figured it out I think it's a good idea to have a mechanic look at the motor . have him check your zincs in the heat exchanger .as well
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