Runaway engine

[Tomm]

Govenor spring?

If you talk to enough people, you get alot of different ideas. It seems Yanmar engines are also used by John Deere on some tractors. A neighbor (a truck diesel mechanic) was talking to a farm diesel mechanic who said he's seen similar trouble on tractor diesels. A runaway engine caused by an older spring on the govenor that looses tension and stretches after heating up and allows the engine to run full tilt. I like this idea because it sounds a whole lot better than an engine rebuild, and it would explain why the engine started again later and seemed to run all right after it cooled down. The boat is out of the water now but I will on it this weekend doing some winterizing projects (snow in the air yesterday). Does this idea make any sense to those of you who know diesels better than I do? Also, I think I would like to take a cursory marine diesel maintenece course someplace and would like some suggestions. I am not a mechanic but, hey, welcome to the world of sailing.Tomm

 

[Mat]

diesel maintenece

Mack Boring has an excellent maintenance class. They have a 1-day introduction class and a 2-day hands-on class.

 

[Tomm Maxon]

Mat, Where and when is the class?

Thanks.Tomm

 

[Wayne Estabrooks]

My thoughts

Tomm & others,I like John Nantz theory best about the increased pressure due to blocked or restricted return line. I wondered if a blocked fuel tank vent could cause this.I look forward to hearing more about this. Good luck Tomm !Wayne - S/V Wind Drift h340

 

[Fred Ficarra]

Wayne, I don't see how

I think your fuel tank would look like one of those Thanksgiving day parade ballons. I'm not sure of the Yanmar injector opening fuel pressure but it has to be around 1000#, I would think,,,