Thermostart problems. ARRGH!

[Midniteoyl]

Ground is made through the threads, same as a spark plug. Never seen a 2 wire version before. The heating of the coil should be what opens the check ball.

Just a thought, and I never heard of it needing adjustment, but maybe?

 

[Jerry/MT]

No the fuel valve is operated by heat from the internal heating element.

Inside a Yanmar thermostart (glow plug) unit.

Yanmar tractor thermostart (glow plug) operation explained.

www.hoyetractor.com

 

[California]

...looking for an original Yanmar thermostart but I'm no holding by breath. A NOS part would be great but any that are left are probably gathering dust in Japan or ...

The used one in my photo is OEM Yanmar. The trademark stamped on it (top side in the photo) seems to be Hitachi.

Nippon Denso and Hitachi are both suppliers of OEM starters, alternators, ignition parts for many Japanese auto manufacturers.

 

[etpm]

No the fuel valve is operated by heat from the internal heating element.

The ones for sale now use heat from a small element to open the valve. The original Yanmar one doesn't look like ones everybody uses now. The original has a steel case that extends about 1.75 inches from the hex. Something is inside that case. I don't know how the original ones work but they don't have two coils that get hot at the business end like they all do now. The original, like I said earlier, has 2 wires coming out, not one. The original is built differently.
Eric

 

[California]

Are you sure what you have there isn't aftermarket? I thought the Perkins-patent one has been standard, widely used, since at least the Perkins 3-cylinder diesel in the MF-135. (1970, + - ).

 

[workinonit]

I saw 'thermostat' and was completely confused.. LOL

Same here.

 

[etpm]

Are you sure what you have there isn't aftermarket? I thought the Perkins-patent one has been standard, widely used, since at least the Perkins 3-cylinder diesel in the MF-135. (1970, + - ).

I think it is stock. It was painted with the same Grey paint as the engine and the two wires connected to it both come out of the original wiring loom. And the loom looks all original.
Eric

 

[etpm]

Are you sure what you have there isn't aftermarket? I thought the Perkins-patent one has been standard, widely used, since at least the Perkins 3-cylinder diesel in the MF-135. (1970, + - ).

Check this out: Thermostart Glow Plug - Yanmar Tractor Support Message Board . The link goes to a page that has a picture of the same type of thermostart that I have. It's in a different model Yanmar tractor but is exactly the same.
Eric

 

[California]

Check this out: Thermostart Glow Plug - Yanmar Tractor Support Message Board . The link goes to a page that has a picture of the same type of thermostart that I have. It's in a different model Yanmar tractor but is exactly the same.
Eric

Wow. You're right. Near 20 years of reading this TBN Yanmar forum and I don't think that version has ever been mentioned here before.

 

[Midniteoyl]

Check this out: Thermostart Glow Plug - Yanmar Tractor Support Message Board . The link goes to a page that has a picture of the same type of thermostart that I have. It's in a different model Yanmar tractor but is exactly the same.
Eric

Huh.. This link in that thread says that it was the old style, replaced by the one wire. Wonder if thats why I've never seen them as they all have been replaced already? Pretty cool.

pic of the 2 wire: