Yanmar 1GM able to start in winter ? - SailNet Community

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Go Back   SailNet Community > On Board > Gear & Maintenance > Engines > Diesel
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Diesel This is a new forum dedicated to diesel engines and their applicable accessories.


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Old 02-25-2013
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Yanmar 1GM able to start in winter ?

I'm looking to buy a sailboat with a Yanmar 1GM. Owner can't get the engine to start. It will start with WD40 injected. Saw a bunch of other threads on fuel investigations.

Question: should the engine run in the winter ? It's 30 degrees now in MD.

I don't have diesel experience - but since there's no glow plugs (right ?) and I don't think there's any heating elements on fuel line - maybe the system isn't designed to run in winter ? Maybe nothing wrong with engine ?

I wonder if heating block/area with a ceramic heater might get to run ?

Thanks !
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Old 02-25-2013
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Re: Yanmar 1GM able to start in winter ?


hello Dave, I suggest you look for air in fuel system it could be it simply needs bleeding. The engine should start below freezing levels if everything is okay. The second place I would look would be the injector. It might be a good idea to keep ether on board (starting fluid) until you get your problems solved. In the meanwhile check the link I gave you and also anything that may be on SailNet regarding your problem.the link I gave you may not be much help that it will lead you to other links that might be more helpful. You can add a heating element (called start pre-heater) at the intake manifold which will also require a universal solenoid to activate. CaptG
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Old 02-25-2013
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Re: Yanmar 1GM able to start in winter ?

Tell the owner to give you a call when it runs, or drop the price as if not only does it not run, but you have to put in the elbow grease to pull it out (at which point the boat should be free).

Seriously, it's either something simple (fuel line, needs warming), or it's major (no compression). WD40 has a lower ignition point than diesel so running it from that proves nothing.
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Old 02-25-2013
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Re: Yanmar 1GM able to start in winter ?

With no glow plug, a 1GM is a bear to start when the temp is cold. Below freezing, all bets are off. If it starts with a quick spritz of WD40, run it for a few minutes to warm it up, then shut it down and start it again in 10 minutes. if it starts easily, without WD40 assistance all is good. if it still hard starting, it's time to look further.
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Re: Yanmar 1GM able to start in winter ?

If that engine is a pre-combustion chamber engine I have read that ether can do big time damage. I used just a very brief whiff of it in 15 degree below
( Fahrenheit) in a VW diesel pre-chamber engine with a dying battery and it immediately fired up. Used it in a Detroit Diesel continuously with no problem. I would guess that WD 40 is far less volatile than ether. Suggest you be careful and not have to buy the seller a new engine.

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