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  • Yanmar Tractors
    • 'YM' Series
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    • 'F" Series
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Yanmar Tractors Deere Tractors General Items Marine Engines

'YM' Series

YM1100 YM135 YM1300 YM1301 YM140 YM1401 YM146 YM147 YM1500 YM1502 YM1510 YM155 YM1600 YM1601 YM1602 YM1610 YM165 YM169 YM1700 YM1702 YM1720 YMG1800 YM180 YM186 YM187 YM1802 YM1810 YM1820 YM1900 YM195 YM2000 YMG2000 YM2001 YM2002 YM2002 YM2010 YM2020 YM220 YM2200 YM2202 YM2210 YM226 YM2220 YM2301 YM2310 YM240 YM2402 YM2420 YM250 YM2500 YM2610 YM2620 YM2700 YM276 YM2820 YM3000 YM3110 YM3220 YM330 YM336 YM3810 YM4220 YM4300 GT14

'F" Series

F14 F15 F16 F17 / FX17 F18 / FX18 F20 / FX20 F22 / FX22 F24 / FX24 F26 / FX26 F28 / FX28 F32 / FX32 F42 / FX42 F165 / FX165 F215 / FX215 F255 / FX255 KE-2 KE-3 KE-4

CubCadet Yanmars

EX450 EX2900 EX3200 SX3100 LX410 LX450 LX490 SC2400 SC2450

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  • Home/
  • Inside A Yanmar Thermostart

Inside A Yanmar Thermostart

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 (fed from a small plastic container mounted just above it) 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 screwed up into fitting (A) and is tightened up against the check ball (B) - forcing it against the ball seat deep 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 also pulls the set screw away from the check ball (B) because the set screw is threaded into the tube that is expanding. This allows a very small amount of fuel to drip down onto the heating element which starts to smoke and burn.

Why do they go bad?

Over time the thermostarts, just like any glow plug can go bad. This is typically because the heating element, which is sort of like a very heavy duty light bulb, burns out. The check valve can also start to leak over time. Running the thermostart for too long (over 10-15 seconds) at one time can also damage it.

Priming A new One.

It may be necessary to bleed the air out of a new thermostart in order for it to start producing smoke and fire. This is done by installing the new thermostart & filling the reservoir bottle with fuel. Then cycle the thermostart on 10 seconds then off 30 seconds. It may take 10-20 cycles to bleed the air out of the line & thermostart.

Where can I get a new one?

Click Here

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