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Why such a low temp thermostat? #5137152
06/17/19 11:21 PM
06/17/19 11:21 PM
Joined: Jun 2003
Posts: 19,172
Apple Valley, California
Chris142 Offline OP
Chris142  Offline OP

Joined: Jun 2003
Posts: 19,172
Apple Valley, California
My tractor calls for a 150F thermostat. I had a 160 so I put that in. Wouldn't a 180 be a better choice? A 195F is too close to the boiling point IMO.


02 Wrangler traveler sae30
87 F250 Valvoline 15w40
07 fjcruiser Chevron 10w30
Z400 castrol T 10w40
Can am maveric edge 5w40
57 case tractor Chevron sae30
Re: Why such a low temp thermostat? [Re: Chris142] #5137172
06/18/19 12:21 AM
06/18/19 12:21 AM
Joined: Jan 2017
Posts: 3,016
VW Fanboy Island
maxdustington Offline
maxdustington  Offline

Joined: Jan 2017
Posts: 3,016
VW Fanboy Island
Pre-emissions and less airflow through the rad than an automobile?


03 Jetta AWP/09A 210k kms
Edge 0W40 + Mann 719/30
Re: Why such a low temp thermostat? [Re: Chris142] #5137210
06/18/19 04:44 AM
06/18/19 04:44 AM
Joined: May 2015
Posts: 1,101
Brittany / Canada
Popsy Offline
Popsy  Offline

Joined: May 2015
Posts: 1,101
Brittany / Canada
My old diesel with aluminium head, mostly pre-emission, got a 160° from factory, along with an oil cooler, same cars with gas engines got a regular 190°, I always thought it was to keep the oil temperature fairly low (the turbo is oil cooled), because oils of that era didn't like high heat much, but maybe it was a naive thought.


96 Barchetta, 300V 5W40 | Forfour 95, SHU 0W40
Mazda 6 2.3, M1 AFE 0W20 | Colt Ralliart, 300V 0W40
Re: Why such a low temp thermostat? [Re: maxdustington] #5137244
06/18/19 05:59 AM
06/18/19 05:59 AM
Joined: Sep 2016
Posts: 211
MN
Tman220 Offline
Tman220  Offline

Joined: Sep 2016
Posts: 211
MN
Originally Posted by maxdustington
Pre-emissions and less airflow through the rad than an automobile?

Pre-emissions is the key. Has nothing to do with airflow, in fact this is one of those things a lot of people get confused about. Assuming equal airflow a radiator is far more efficient when filled with 200 degree coolant vs. 160 degree coolant. Far more temp differential.


2012 Regal GS Turbo PP 5w30 90k
1994 Camaro Z28 LT1 355 CI, 430 RWHP PP 5W30 165k
2005 GMC Sierra 1500 5.3 160k
2004 Civic LX M5 178k
2007 Camry 2.4 232k
2016 Victory Vegas
Re: Why such a low temp thermostat? [Re: maxdustington] #5137271
06/18/19 07:07 AM
06/18/19 07:07 AM
Joined: Jun 2003
Posts: 19,172
Apple Valley, California
Chris142 Offline OP
Chris142  Offline OP

Joined: Jun 2003
Posts: 19,172
Apple Valley, California
Originally Posted by maxdustington
Pre-emissions and less airflow through the rad than an automobile?

It has a solid mounted fan that blows like a hurricane.

Reason I bring this up is because the top end is pretty dirty. I assume from the oil not getting hot enough to evaporate the moisture. Also. No pcv system, just a vented cap.

I blocked part of the radiator last night and let it run about 185F for about an hour.


02 Wrangler traveler sae30
87 F250 Valvoline 15w40
07 fjcruiser Chevron 10w30
Z400 castrol T 10w40
Can am maveric edge 5w40
57 case tractor Chevron sae30
Re: Why such a low temp thermostat? [Re: Chris142] #5137282
06/18/19 07:16 AM
06/18/19 07:16 AM
Joined: Oct 2005
Posts: 4,587
Kansas
Kruse Offline
Kruse  Offline

Joined: Oct 2005
Posts: 4,587
Kansas
First, your radiator is a non-pressurized system and, from the factory, was designed for water only. Back then, the tight-wad farmers didn't add antifreeze. If they did, it was alcohol-based, which had a low boiling point. During the cold winter in all places except California, the water was usually drained every night. Also, your gas tank sits very close to your engine. They didn't want the gas to vaporize because it was so close to the hot block.
A couple of weeks ago, I drove my Oliver 70 about 10 miles in 90° weather. (Google for a photo of an Oliver 70. From the factory, it had enclosed tin around the engine) Now gas is different than it was back in 1938 when it was built, but my tractor did experience vapor lock the final two miles of driving. Your 180° MIGHT work, unless your are plowing the back 40 in high temperatures.

Last edited by Kruse; 06/18/19 07:17 AM.
Re: Why such a low temp thermostat? [Re: Tman220] #5137292
06/18/19 07:42 AM
06/18/19 07:42 AM
Joined: Jan 2013
Posts: 2,985
Texas
WyrTwister Offline
WyrTwister  Offline

Joined: Jan 2013
Posts: 2,985
Texas
Originally Posted by Tman220
Originally Posted by maxdustington
Pre-emissions and less airflow through the rad than an automobile?

Pre-emissions is the key. Has nothing to do with airflow, in fact this is one of those things a lot of people get confused about. Assuming equal airflow a radiator is far more efficient when filled with 200 degree coolant vs. 160 degree coolant. Far more temp differential.


Yes , greater delta T . Assuming constant / consistent ambient temperature .


Wyr
God bless
Re: Why such a low temp thermostat? [Re: Chris142] #5137298
06/18/19 07:53 AM
06/18/19 07:53 AM
Joined: Jan 2015
Posts: 1,169
missouri
ragtoplvr Offline
ragtoplvr  Offline

Joined: Jan 2015
Posts: 1,169
missouri
Your tractor was designed for that temperature thermostat. Going hotter is risky. Car engine operates at 10% load most of the time. When working a tractor engine is over 80% load, it is severe service. I had a old allis, I added a pvc system and oil vapor separator. The oil did stay cleaner. When mowing, it did get the oil hot enough to drive off the water, the catch can had to be drained every day. First day I must have drained a pint. Then it went down to about a ¼ cup.

Rod

Re: Why such a low temp thermostat? [Re: Kruse] #5137300
06/18/19 07:54 AM
06/18/19 07:54 AM
Joined: Jun 2003
Posts: 19,172
Apple Valley, California
Chris142 Offline OP
Chris142  Offline OP

Joined: Jun 2003
Posts: 19,172
Apple Valley, California
Originally Posted by Kruse
First, your radiator is a non-pressurized system and, from the factory, was designed for water only. Back then, the tight-wad farmers didn't add antifreeze. If they did, it was alcohol-based, which had a low boiling point. During the cold winter in all places except California, the water was usually drained every night. Also, your gas tank sits very close to your engine. They didn't want the gas to vaporize because it was so close to the hot block.
A couple of weeks ago, I drove my Oliver 70 about 10 miles in 90° weather. (Google for a photo of an Oliver 70. From the factory, it had enclosed tin around the engine) Now gas is different than it was back in 1938 when it was built, but my tractor did experience vapor lock the final two miles of driving. Your 180° MIGHT work, unless your are plowing the back 40 in high temperatures.

Actually it is pressurized! 4 psi! It is hot. 100+ is common.


02 Wrangler traveler sae30
87 F250 Valvoline 15w40
07 fjcruiser Chevron 10w30
Z400 castrol T 10w40
Can am maveric edge 5w40
57 case tractor Chevron sae30
Re: Why such a low temp thermostat? [Re: Chris142] #5137304
06/18/19 08:03 AM
06/18/19 08:03 AM
Joined: Jun 2013
Posts: 1,915
Virginia
mattwithcats Offline
mattwithcats  Offline

Joined: Jun 2013
Posts: 1,915
Virginia
Thermosiphon cooling system?

No water pump, just physics moving hot water up, cold water down...


2009 Smart Pure
Pennzoil Platinum Euro 0W-40, Wix XP 51356 filter, 45 mpg...
185/55R15 General HP tires, "H" speed rated, 44 psi (300 kpa)
Re: Why such a low temp thermostat? [Re: mattwithcats] #5137316
06/18/19 08:27 AM
06/18/19 08:27 AM
Joined: Dec 2016
Posts: 9,114
Waco, TX
Linctex Online content
Linctex  Online Content

Joined: Dec 2016
Posts: 9,114
Waco, TX
Originally Posted by mattwithcats
Thermosiphon cooling system?

No water pump, just physics moving hot water up, cold water down...


My 1949 Farmall "C" is Thermosiphon with a fan.

Later "Super C" engines got a water pump.


"The evidence demands a verdict".
(Re:VOA)"it's nearly impossible to actually know the particular additives that are in there at what concentrations."
Re: Why such a low temp thermostat? [Re: mattwithcats] #5137353
06/18/19 09:19 AM
06/18/19 09:19 AM
Joined: Jun 2003
Posts: 19,172
Apple Valley, California
Chris142 Offline OP
Chris142  Offline OP

Joined: Jun 2003
Posts: 19,172
Apple Valley, California
Originally Posted by mattwithcats
Thermosiphon cooling system?

No water pump, just physics moving hot water up, cold water down...

Its not that old LOL! It has a belt driven water pump.


02 Wrangler traveler sae30
87 F250 Valvoline 15w40
07 fjcruiser Chevron 10w30
Z400 castrol T 10w40
Can am maveric edge 5w40
57 case tractor Chevron sae30
Re: Why such a low temp thermostat? [Re: Chris142] #5137482
06/18/19 12:10 PM
06/18/19 12:10 PM
Joined: Oct 2017
Posts: 145
VA
thastinger Offline
thastinger  Offline

Joined: Oct 2017
Posts: 145
VA
My 49 Farmall C doesn't have a water pump at all...but it has a helluva fan on it

My 68 JD 3020D rad was designed for water only or people would add alcohol to the water, alcohol evaporates at 173 degrees...hence the 150 thermo

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