Green Yanmar Problem

[R Barger]

Diesels are much more efficient than gasoline engines, as they are fuel limited. A fair amount of the non-work heat losses are passed through the exhaust due to lean mixtures burnt in a diesel engine.

That said, my apologies, I am still trying to understand your problem. The engine isn't overheating, it runs, and it leaves some coolant in the reservoir. That sounds like normal operation from this armchair. What am I missing?

All the best,

Peter

All last summer it expand into reservoir and failed to return to the radiator. Every third time I would use it I would have take the coolant out of the reservoir and put back in the radiator myself. If you read post#1 you will see what all I have done to solve the problem. Today when I ran it there was no problem [no thermostat and back flushed the radiator, clear water]. The tractor has never overheated just the problem of the coolant no returning to the radiator.

 

[tacticalturnip]

LOL, here's what I thought from the thread title:

View attachment 2834642

Same here; that lovely pea soup green!

 

[bmaverick]

Same here; that lovely pea soup green!

Yanmar calls it Tree Frog Green.

 

[California]

... Leisure Suit Green!

From the decade when it was made.

 

[tacticalturnip]

Is it bad that I genuinely like the color?

 

[rScotty]

When the coolant expands it goes to the overflow tank and should be sucked back into the radiator. After a few times of running the over tank overfills if I don't take it out and return it to the radiator.

Everything you mention could simply be that needs the hose renewed between the radiator and the overflow tank.

 

[bmaverick]

Is it bad that I genuinely like the color?

Actually, there were 2 shades of Tree Frog Green, but no worries from me.

 

[R Barger]

Everything you mention could simply be that needs the hose renewed between the radiator and the overflow tank.

Already did that. I did run again today 2000 rpm for 15 mln with no problems [after back flushing the radiator, removing the thermostat with clear water]. I am considering putting the coolant back in and leaving the thermostat out. I only use this tractor for mowing in the summer. The ym2500 [same tractor uses no thermostat]. If it acts up again I'll do the head gasket.

 

[California]

Actually, there were 2 shades of Tree Frog Green, but no worries from me.

Are there examples of each?

 

[bmaverick]

Are there examples of each?

Yes, you can see examples in this posted thread,

Yanmar - Model Cover Pages

The tractor historian in Japan mentioned this on his site too.

When farmers looked into their fields from a distance and seen the green Yanmars, it took on the name Tree Frog as it looked among the crops.

Translated,
"I can not tell the difference, ... Is that a Tree Frog. Is that really the case here."

Lite Tree Frog Green,

Dark Tree Frog Green,

The Kramp swatch matches the Lite Tree Frog Green,