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Normal Operating Temperature

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JKC

06-20-2004 13:40:29

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I hope this is a simple question, but would be interested in ALL opinions. What is the "normal operating temperature" for most tractors built in the 1950's and 1960's. I suppose it depends on your definition of that term. Second question: What is the average temperature a tractor should reach while PTO at 540 RPMs and the tractor under the load of a Woods rotary mower? I look forward to all opinions. Thanks very much.

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Ron

06-21-2004 09:49:56

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Re: Normal Operating Temperature in reply to JKC, 06-20-2004 13:40:29

Ever notice that in an "in-line" 4 or 6 cylinder engine, the Front cylinder is Always worn on the front ( cold water inlet side ) of the cylinder..?? This is caused by that side of that cylinder always running cooler because of the incoming cooler water..!! Oils lubricate at their best at temps in the 180 to 200 degree range..which might mean the oil temps might be 200 to 240 At less than 160, wear is definitely accelerated--the engine parts are not fully expanded to operating tolerences, etc..

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Tommy D6-8U

06-21-2004 07:53:27

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Re: Normal Operating Temperature in reply to JKC, 06-20-2004 13:40:29

JKC,

There is a tendency for people to think that cooler is somewhat better but as others here have said, the engine needs to operate at a certain temperature to be most efficient. I would think most engines in that era would run from about 160 up to about 200. I think more towards the 190-200 mark myself. Without trying to sound technical, thermodynamic principles will prove the engine is more efficient the hotter it can run (to a point of course). Hope this helps!

Tommy

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kyhayman

06-20-2004 19:12:10

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Re: Normal Operating Temperature in reply to JKC, 06-20-2004 13:40:29

Depending on the tractor (and it depends a lot!). Some run struggle to keep a minimum 140-180 unless working hard. Some have a high pressure system and normal runs up to 230, others would melt down at that temp. It would help a lot to know model and fuel type.

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JKC

06-21-2004 05:37:31

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Re: Re: Normal Operating Temperature in reply to kyhayman, 06-20-2004 19:12:10

The tractor is a 1967 Minneapolis Moline Jetstar 3 Super Gas. I noticed that it never seems to get any hotter than about 140-150 degrees, and was wondering if perhaps the gauge was not working properly.

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Ron

06-21-2004 06:05:52

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Re: Re: Re: Normal Operating Temperature in reply to JKC, 06-21-2004 05:37:31

Verify that you have the correct thermostat and that it's working.

If OK, then yes, the gauge (actually more likely the sending unit) may not be working correctly.

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wdtom

06-20-2004 17:49:58

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Re: Normal Operating Temperature in reply to JKC, 06-20-2004 13:40:29

180 to 200 degrees is fine, closer to 200 is probably better. The manual for my Allis WD states that it needs to be at least that warm for "tractor fuel" so there is no harm, even recomended. A warm engine will not carbon up as much, will vaporize the fuel better, and warm oil will not contaminate as fast. I used to like 180 dregrees for engines, now I am leaning more towards 200. Using a 50/50 anitfreeze mix you will not boil until something like 230 or more even if you don't use a pressure cap.

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RJ-Az

06-20-2004 16:53:56

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Re: Normal Operating Temperature in reply to JKC, 06-20-2004 13:40:29

All the tractors from that era that I remember running had a graduated gauge that was green(cold, white(normal) and red(hot) I don't remember any temp degrees. Most hsd a 160 or 180 degree T-Stat.

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Ron

06-20-2004 14:26:46

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Re: Normal Operating Temperature in reply to JKC, 06-20-2004 13:40:29

The thermostat determines the minimum operating temperature of any engine. If the engine is operating at much above the minimum, there is some defect in the cooling system as most tractor cooling systems are designed to remove enormous amounts of heat.

Example, I can pull 3 bottoms through heavy red clay at full throttle and never see temperatures above the rated opening temperature of the thermostat.

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buickanddeere

06-20-2004 21:14:32

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Re: Re: Normal Operating Temperature in reply to Ron, 06-20-2004 14:26:46

I agree with WDtom. A lightly loaded diesel often will not warm up to rated temp. Diesels always flow full volume of air through the engine. At light loads the extra unburned/unused air just sweeps the heat right out of the engine and up the stack.

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