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Opened thermostat housing and no thermostat !!!!

B

BigTone

Member
Went to replace the thermostat, opened up the housing and there was no thermostat....would that cause the engine to over heat? (sorry, probably a dumb question but im just a rookie at this)

Im going to have to have a talk with the previous owner to find out what else he messed with or messed up!!
 
The engine was probably overheating so he took the thermostat out. Not too uncommon to find one without a tstat.
 
Very common. Outside fins might be plugged with dirt. Radiator probably needs to be dipped by a radiator shop. Not all that expensive.
 
Just put another thermostat in it. If it was stuck closed it would cause overheating. It was all too common to toss the thermostat because many people think they get more flow without it. Unless the previous owner promised a guarantee in writing (not likely) you are now responsible for the tractor. The previous owner of my Super M modified the hydraulic relief valve so that neither it or the parts manual made sense. With the help of Dave Slater on this forum we got it figured out -- actually Dave did the figuring. You just don't know what you will run into.
 
The reason it heats without a thermostat is that the water in the radiator circulates so fast it doesen"t have time to cool in the radiator, common on not all engines but some.A new thermostatwill cure your problem.
 
The lack of thermostat will NOT cause it to overheat, that is an old wives tail. The owner probably removed it because it was overheating. Either the radiator or engine is probably plugged up.
 
Had the same thing on my Farmall H. Seems to be a common thing for people to do when they don't like looking after a machine properly.
SadFarmall
 
It's overheating due to a problem with the radiator being plugged,or, water pump not working,or, thermostat sticking closed,or, cooling jacket in motor being full of sludge.

It seems to be really common for the thermostats to be gone on Farmalls.

I've heard of the "overheats because of no thermostat" but have never had it happen on any vehicle I've ever owned. I can't quit wrap my mind around the concept that "moving the coolant through the radiator faster" can make it accumulate more heat. The radiator removes heat!

I did remove several thermostats on junk cars back in the day in an attempt to get them to run cooler. At the time I was too broke to afford proper repairs. It's definitely a band aid fix that didn't always work. It was sure miserable in the winter time when the coolant didn't get hot enough to provide heat.
 
....would that cause the engine to over heat?
Click to expand...

naw, if it does, there are other problems
biggest problem with no thermostat, is with
any tractors super cooling system,
is they never warm up completely under light work,
which is a bad thing.

In my drag race days, I used to put in a plate with a hole in it
in place of the thermostat.
You do want some restriction there.
 
(quoted from post at 20:29:31 06/15/12) The reason it heats without a thermostat is that the water in the radiator circulates so fast [u:8a08c556c3]it doesen"t have time to cool in the radiator[/u:8a08c556c3], common on not all engines but some.A new thermostatwill cure your problem.
Click to expand...
:shock: It also runs so fast through the engine that it doesn't have time to heat up.
 
No it is not! Friend had a 650 diesel completely rebuilt, brought it home and it would overheat with light work. They checked everything they could think of and it would still overheat, even just driving down the road. When I was up there I said maybe the thermostat is bad, and took a look. Guess what, no thermostat! Put one in and it has never given any problems again. You can plow all day long and it will not over heat.
 
I have heard of engines overheating when thermostat was missing, but it is not due to the coolant flow going through the radiator so fast it cannot cool down. It is because the block and head and or head gasket have restrictions built into them to equally distribute the coolant. When you run an engine at high rpm's you sure have a lot more coolant flow than you do at low rpm's so it has to have a resistance to control the flow into all the parts that need cooling. The small engines that used thermo syphon cooling take a different head gasket than the same engine with a water pump added and it is the port size in different places that is different . With out a thermostat you would most likely push a lot of coolant through the front part of the engine and very little through the rear . If the heat sensor is in the part with poor flow it will read high. Not an engineers explanation but it should get some points across as to why you always want to have a proper thermostat installed in an engine designed for one.
 
As I understand it, it is kind of a common problem for the thermostat to stick closed especially if the tractor has sat for a long time without running. Had that happen to my 656 when I had some repair work done and it sat for over a year without being used. After I started it the first time, the temperature gage almost pegged. I let it cool off and started it again, revved the tractor up, and the thermostat got unstuck. Not saying it is right, but I think some people get tired of screwing with the stuck thermostats and take them out.
 
The only time I had one over heat was when the stat was in it . My Cub and my H and both DC"S have never had a stat in them and never had a problem with them over heating, Kenny.
 
(quoted from post at 07:56:31 06/17/12) The only time I had one over heat was when the stat was in it . [u:248039b40f]My Cub [/u:248039b40f]and my H and both DC"S have never had a stat in them and never had a problem with them over heating, Kenny.
Click to expand...
Cubs never had thermostats or water pumps.
 
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