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Old 03-22-2020, 09:13 PM
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Default Operating temp

Today I had to use the track hoe to position a propane tank.
I have been noticing that the operating temp goes into the edge of the green zone and sits there. It climbs to that line fairly quick. The engine is a Yanmar 3D84-1A about 25hp.

Not knowing what that green zone really is, after an hours operating, I took a reading on the thermostat housing, and got 152 F.
I think it is too low. I did some checking and found it is supposed to begin opening at 160 and be full open at 191. And some say 170 to begin opening.
This is like the old cummins type thermostat, which shuts a port on the pump, and water doesn't pass through the opening like an auto thermostat.

So any of you who have this engine in the 3 or 4 cylinder config, in a skid steer or mower, what is your experience?
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Old 03-22-2020, 10:20 PM
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greywynd greywynd is offline
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I don’t know that engine, most excavators seem to struggle with enough engine load to really warm up though. I swear the mini I had the hydraulic oil got warmer than the antifreeze did!!


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Old 03-23-2020, 01:08 AM
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I don’t know that engine, most excavators seem to struggle with enough engine load to really warm up though. I swear the mini I had the hydraulic oil got warmer than the antifreeze did!!


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I think that's common to the species. I have to say this little thing surprises me all the time. I had a full 500 gal propane tank, and it would easily lift one end and swing it. I may have been able to lift the whole thing but I didn't want to try.

Maybe I'll have a chat with SMS and see what they say about engine temp.
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Old 03-23-2020, 09:28 AM
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Originally Posted by Ironman View Post
I think that's common to the species. I have to say this little thing surprises me all the time. I had a full 500 gal propane tank, and it would easily lift one end and swing it. I may have been able to lift the whole thing but I didn't want to try.

Maybe I'll have a chat with SMS and see what they say about engine temp.
Dash gauges are notoriously incorrect. Maybe use a thermometer in the radiator????
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Last edited by milomilo; 03-23-2020 at 09:37 AM.
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Old 03-23-2020, 10:10 AM
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Dash gauges are notoriously incorrect. Maybe use a thermometer in the radiator????
I used my made in US imported infra-red temp gun (Which I paid $400 for 30 years ago)

The dash gauge does not even pretend to be accurate, just white, green, red zone stuff.

Just seems that for clean burn and fuel efficiency, an engine should be 180+
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Old 03-23-2020, 10:39 AM
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Remember Gerry, that if you're gonna be out side the normal operation range of an engine, being on the low side is always better.
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Old 03-23-2020, 05:11 PM
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Remember Gerry, that if you're gonna be out side the normal operation range of an engine, being on the low side is always better.
Oh yes it is.
The history of this unit is that it was from Vietnam, and with their ambient temp it probably never saw the gauge down to zero.
They didn't need antifreeze either as I discovered. I at first thought there was a low stat for hot countries, but not according to Yanmar.
Sill waiting for the dealer SMS Equipment to call back.
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Old 03-23-2020, 07:02 PM
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I wonder if the thermostat is not closing all the way? In the last 5 years I've had 2 thermostat failures in my Powerstroke, the first one started sticking closed too long then it would open but only briefly, the temp was jumping to 220-230 then it would open for a short time and the temps would come back down, then repeat. I changed it and all was good for 3 years, staying between 195 and 210, now this winter it is opening too soon, I can barely keep 180 working it hard and it drops to 160-170 idling. I am able to get very accurate temps with my DiPricol gauge and sender mounted right on the water pump.The thermostats are 203 degree from a respected diesel parts dealer. The colder temps hurt my MPG and accelerate engine wear.

By the way my factory dash "gauge" never moves from normal through all of this.
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