1510D Thermostat?

[rock2610D]

I tend to disagree with the Yanmar engineers on this issue...

Why you ask?

1) My 2610 had a cracked head probably from overheating. A thermostat allows water to cool longer in radiator before being put back into block.

2) John Deere has Yanmar engines and thermostats, have to ask why if Yanmar does not recommend..

3) using a piece of cardboard is risky at best.. Just forget just once while tilling or hogging in 80 degree weather and see what happens..

4) Thermostats are put on every engine I can think of except our tractors...I have to assume they are somewhat benificial..Can you get by with out one YES. Would it be nice to have one yes.

 

[dieselgeek]

I wonder if the Japanese farmer just blocks part of the radiator with cardboard. The grays generally arrive over here in good condition after 20 years of whatever the Japanese do with them, so they must be doing something right. I'm not convinced these need a conversion to thermostats and gauges to adapt for US use.

My (US) Yanmar was used in a riding stable for its first 10-15 years, hardly intensive use. Then apparently semi-retired, and fired up occasionally when the loader was needed. Per the comments above you would think it would be long dead. It's not; I don't see any of the claimed detrimental effects. It doesn't have a thermostat.

In my opinion, just verify the warning lights occasionally. (The manual says each 100 hours). That's all Yanmar intended the owner to do.

Then it sure does seem strange that US versions of my engine would have a thermostat designed in there by Yanmar, eh?

 

[California]

Then it sure does seem strange that US versions of my engine would have a thermostat designed in there by Yanmar, eh?

Designed in by Yanmar, or insisted on by Deere?

I like to think the YM240's that Yanmar sold here were so perfect that they scared Deere into importing Yanmars instead of designing something to compete against them.

Of course Deere had to add some of their own specifications to their contract specs, but the 240's here had already showed that a Yanmar could run without a thermostat.

I agree a thermostat is a good idea, but there is also value in designing an export model with as few parts as possible. I expect some of these 240's were sent to Africa etc with a spare parts kit and ran 20 years with no dealer support whatever. It's that simplicity that I like about mine.

 

[dieselgeek]

either way, I know for sure that running this engine for any amount of time at 160 degrees is far better than running it at 70 degrees for the same amount of time. I'm sorry if your opinion differs, I'd probably think the same way if I had different job experience. Opinion or not, John Deere and Yanmar put thermostats in engines not destined for warm climates; with all due respect, unless you have some engineering info that I am missing, you probably won't convince me that a piece of cardboard or ignoring the issue, is the way to go

 

[California]

I don't think we are that far apart. I agree that a thermostat is needed to run any IC engine with reasonable efficiency, to prevent sludging longer term, and to minimize harmful exhaust emissions. And that getting it up to at least 160 is important, whether it's by cardboard or a modern thermostat.

It's just that I think these earlier Yanmars evolved, slightly, from ones that were nearly a direct replacement for a water buffalo used for tilling. The manual talks of draining the coolant for winter if you don't use antifreeze, check the fuel filter often if the fuel sold in your region has more that a tablespoon of debris per 5 gallons, and probably some other considerations we would consider primitive today. Given today's better fuel and lubricant, and the fussy maintenance a hobby owner will likely provide, these things should run forever.

 

[larso1]

John Deere's not the only company that has thermostats installed in their Japanese built tractors. The Bolens (USA market) equivalent of my Iseki TS1610f (Biolens G194) also had a thermostat, whereas mine does not. Just an additional bolt-on casting on the front end of the engine block that contains the thermostat with a bypass line. I would bet that most other US market Japanese makes do too (Mitsubishi, Shibaura, Hinomoto, etc.). I looked at several used inline thermostat housings on E-Bay (even bought a couple, real cheap) that I could just splice into the coolant hose, mostly motorcycle types, but they just didn't have big enough connections for my tractor's hoses. I finally just dropped the thought and haven't really had any problems, just let it warm up for 10 minutes or so before using, cool down the same.

Bill