3GM30F fuel regulator stuck

[tugboat]

My engine hasn't been run for several years. I started it yesterday and it ran away as the throttle and stop controls had no effect on the fuel regulator. The only way I could stop it was by bunging up the air intake. I confess I was pretty shaken by the incident!
I'm guessing something has stuck inside the regulator doodad due to not moving for so long.
Is there anything I can likely do myself before I call in the professionals to do a major dismantling?
Thanks.

 

[VicS]

My engine hasn't been run for several years. I started it yesterday and it ran away as the throttle and stop controls had no effect on the fuel regulator. The only way I could stop it was by bunging up the air intake. I confess I was pretty shaken by the incident!
I'm guessing something has stuck inside the regulator doodad due to not moving for so long.
Is there anything I can likely do myself before I call in the professionals to do a major dismantling?
Thanks.

There is a workshop manual at http://www.motoren.ath.cx/menus/yanmar.php Maybe something in the GM-HM manual that will be of help/use.

 

[bikedaft]

Mine did this a couple of times this cold winter, tho high revving/not idleing rather than running away

Stop control did work on mine however so maybe not exact same problem

Mate who used to run a hundred of these engines (land based) says they are a pita to take apart the throttle mech. He suggested silicone spray or similar on/around the throttle body in the hope some would get into the sticky spot

When you (engine off) operate the throttle cable, does it return to idle?

Easy to disconnect throttle cable at engine end, and operate lever manually - does it return to idle?

Etc

Have fun remember not to put your hand over the air intake. And not too small a rag, or it gets sucked in. When you kill the engine that way

 

[tugboat]

The levers directly on the speed regulator body either don't move or have no effect, so the problem must be inside. The cables are all free. I have no idea what the gubbins looks like inside, I guess I was hoping someone (knowledgeable) might suggest judicious use of a rubber mallet might shock things free, but things are rarely that simple. At the end of the day, it's my fault for not regularly exercising the controls.

I'm wondering if to go around claiming to have stopped a runaway engine, and accept the adulation of the public!

 

[bikedaft]

Try plus gas or your freeing agent of choice, and leave for a day or three before taking it apart. Worth a try, and if your boat is anything like ours then you can get on with all the other stuff that needs fixed meantime...