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post #1 of Old 08-04-2012 Thread Starter
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Yanmar Thermo-START Glowplug

When I purchased the sailboat the Yanmar 2QM15 had a Thermo-Start plug installed on the air intake horn, but it wasn't connected to anything, just the plug and a length of hose. I see no reference in the service manual about this setup, but it intrigued me enough to search the net and discovered the tractors have this cold-start feature. Does anyone have any experience with this setup? How do I complete the installation electrically? Is it even advised to use this on a marine motor?? Any help/advice would be greatly appreciated....
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post #2 of Old 08-04-2012
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Re: Yanmar Thermo-START Glowplug

Yanmar marine engines don't use glow plugs. If you are having problems starting the engine you need to trouble-shoot the problem and correct it.
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post #3 of Old 08-04-2012
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Re: Yanmar Thermo-START Glowplug

it does exist
Yanmar Tractor Thermostart Plug
What is a Thermostart?
A Thermostart is a very efficient glow plug used in most of the Yanmar tractors. Instead of relying on just a heating coil like other glow plugs- this unit also drips a small amount of diesel fuel onto the red hot coil. This produces thick smoke, lots of heat, and occasionally small flames. All of these things help the engine to start in the coldest weather.

So how does it work?
The fuel line is connected to the thermostart through the fitting (A). The fuel is not allowed to leak out because the set screw (C) is tightened up against the check ball (B) - forcing it against the ball seat inside fitting (A).

When you are ready to start the tractor the glow plug gets energized through the terminal (D) and heats up the element (F). This causes the hollow tube at the bottom of (A) to expand. When the tube expands it pulls the set screw away from the check ball (B). This allows a very small amount of fuel to drip down onto the heating element which starts to smoke and burn.


Sounds dangerous for a marine application but I guess it's going to be great discussion!

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post #4 of Old 08-04-2012 Thread Starter
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Re: Yanmar Thermo-START Glowplug

Yeah that kinda concerned me too....fire and smoke? That is worrisome. The little engine has always been hard starting, but once its warm it fires up again no problem and runs like a top. Pretty much the same all summer, but when the colder weather hits, it has its issues. It's coming on 33 years old...so I have the utmost respect for it. Thanks for your opinions, they all mean a lot!
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post #5 of Old 08-05-2012
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Re: Yanmar Thermo-START Glowplug

If the fuel drip glow plug has been jerry-rigged onto the air intake horn does that mean that someone has removed the air filter from the housing? Don't know how you could have smoke and fire at the air filter inlet without damaging the foam filter element.

I'd remove the glow plug and put a piece of duct or aluminum tape over the hole and ensure I had a good air filter in place. Then look for other reasons for hard starting other than cold temps.

Both the 2QM15s I own have always started if they have clean fuel delivered to the injectors at the right pressure with adequate air and enough battery to spin the engine a time or two. Cabin/fuel temperature has always been above about 40F so I don't have experience for colder temps.
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