Ridiculous! Thermostat help?

[pmsmechanic]

What I got is 2.5. I think I need 2.75. The 2.5 is the size of the inlet. It barely slips down in the pipe, but it does. It won't sit on the lip for it.

If you can't get the right size you could cheat by cutting two pieces of tin to fit the 2.75 ". If you cut a hole into those two pieces of tin and sandwich the thermostat in there it would get you by.

 

[pmsmechanic]

My first truck was an '85 F250 6.9 diesel. I used to block PART of the radiator with cardboard to help it warm up. But never the whole thing. I added some coolant without bleeding it. But I didn't think I needed to since it was only a gallon low.

On my 90 Cummins I have a winter front on the grill. I open the flaps at around 0 C. On my 98 I have a piece of cardboard covering the whole rad right in front of the intercooler. I pull the cardboard at around 0 C. Otherwise when it gets to -25 or 30 C you just can't get he cab to warm up.

 

[Redneck in training]

Go to autoparts and buy infrared thermometer pistol. They cost less than $30. Very usefull for many things around the farm. Good for checking fuses, breakers, bearings, bad electrical conection, insulation leaks, heating, radiator temperature and many other things. The cheap one have no emisivity correction so the temperature measured can be little off if the object is not black. When I need more precise measurement I spray a spot of black paint on the object or put on it a patch of black electrical tape.
Shop General Tools & Instruments The Heat Seeker 8:1 Professional Infrared Thermometer at Lowes.com
Performance Tool W89721 - Infrared Thermometer | O'Reilly Auto Parts
TIF Instruments TIF721 - Pocket IR Thermometer | O'Reilly Auto Parts

 

[DerekA09]

On my 90 Cummins I have a winter front on the grill. I open the flaps at around 0 C. On my 98 I have a piece of cardboard covering the whole rad right in front of the intercooler. I pull the cardboard at around 0 C. Otherwise when it gets to -25 or 30 C you just can't get he cab to warm up.

Yeah I had a 98.5 24 valve and it had a cover that had snaps around the entire grill. That helped some, but even without the cover I never noticed mine running low temp once it got there. Just took longer than normal to get there.

 

[Cat_Driver]

Thermostat - Regular THM 191 | Buy Online - NAPA Auto Parts

It takes a little digging in the Parts Catalog (PC0244)to figure this out...



If thermostat is mounted vertically:

AA5749R (Range 160ｺ-178ｺ F)

Part Number: AF1710R
Replaces Part: AA5749R
Part Price: $214.55
Description: Thermostat

OR:

AA5750R (Range 180ｺ-195ｺ F

The part AA5750R is no longer available.


---------------------------
If thermostat is mounted horizontally:

Part Number: AR77411
Replaces Part: AF1522R
Part Price: $64.96
Description: Thermostat - THERMOSTAT, 195 DEGREES

Alternative Part
A-AR77411 Thermostat - THERMOSTAT 195 DEGREE - $67.95 (A&I)


Try a Gates stat for about $40 on eBay etc. the #33049 is 2.875" in diameter and is 190F.
There is a Stant that also fits. A #45479 or #13479 for the cheaper Stant.
If you prefer NAPA then a #357-180 or 33388 .

There, those are three sources of stats that will work.

FOUD IT ALL HERE:
Thermostat for 6 - John Deere

 

[beenthere]

I'm curious, but for what reason are you trying to get the temperature up in your 730 ? You mention "operating temperature" in the OP, but I don't see any real problem as long as the Deere starts and runs ok.
Or is it what you feel you need to just do it because you are chasing that coolant leak and are "there" ??

 

[MORRISONSTEEL]

At $200 each, the stock will likely stay high for some time ;-)

No, probably not priced right to sell to the budget minded restorer. But it is a relatively unique thermostat, may not be other options if originality of the tractor is desired. If not there will be alternatives to the industrious.

 

[DerekA09]

I'm curious, but for what reason are you trying to get the temperature up in your 730 ? You mention "operating temperature" in the OP, but I don't see any real problem as long as the Deere starts and runs ok.
Or is it what you feel you need to just do it because you are chasing that coolant leak and are "there" ??

Isn't it bad on the motor to operate it if it's not up to correct temp?

 

[RNeumann]

On older vehicles the reason would be efficiency. The spark plugs and automatic choke are designed for a certain temp range.

Have you tried simply walking into a parts store with what you have in hand? The OD of the thing can't be that odd that they wouldn't have something that would get you in the range. I bet a good auto parts store has 50-100 to choose from.

 

[beenthere]

Isn't it bad on the motor to operate it if it's not up to correct temp?

Don't think it is "bad" nor will it damage anything. Just not as optimum as it could be. But your call and gut feeling.

 

[adventure bob]

Have managed to check the thermostat operation? Is it working right? Id make sure before dropping $200 on a thermostat.

I guess my question is why do you think its not reaching operating temp? Is it a gauge indication or is it truly running cold? Can you stick your hand on the head?
In the list of things to check, the order I would suggest is: run it for an amount of time where it should be up to temp. Heat gun the head (much safer than attempting to touch it). If that's ok, then its your tractor temp gauge. If that's not ok heat gun each exhaust pipe off of the head. If they are all hot then heat gun the radiator. If one or more of the exhaust pipes is cool then you have a cylinder not firing which dramatically reduces the heat output of the engine. Low temp engines are caused by 1 of 2 things: Not generating heat or displacing heat too fast; either should be found by what Ive suggested.

 

[beenthere]

With his 2 cyl JD 730, losing one cylinder by not firing will be some noticeable.. for sure, for sure.

 

[adventure bob]

Not familiar with the 730, but I would imagine you'd notice a 50% drop in performance. Thought it was a small 4cyl.

 

[beenthere]

Big 2 cyl
TractorData.com John Deere 73 tractor information

And for a pic of Derek's 730, see reply #9
http://www.tractorbynet.com/forums/...where-post4658077.html?highlight=#post4658077

 

[DerekA09]

Ok so I did put the thermostat in water and brought it to boil then let it cool off. It opened shortly before the water started boiling and then slowly closed after the water stopped. So I'd say I should have just bought a heat gun and tested the temp sensor spot to begin with. But oh well had to pull most of that off anyways to re thread the manifold bolts so coolant couldn't seep through. Yeah, if I don't notice losing one cylinder I don't have any business operating that tractor lol And I was worried about increased cylinder wear of not operating at temp. This isn't a parade tractor. It's the only one I have so it's a working tractor.

 

[adventure bob]

I'm assuming that the operational temp of this tractor is between 195 and 205 and if it opened just before boiling (212) then it should be good to go. I usually use a candy thermometer to check actual temp to make sure it meets spec.
So Id move on to the sender and gauge as the issue. I would however put it back to together and double check head temp with a heat gun.

 

[pmsmechanic]

Actually if you have a heat gun there is no need to remove the thermostat to check it. If you measure the temperature of the thermostat housing with the heat gun you can see at exactly whet temperature the thermostat opens and closes. Just throw a garbage bag over the radiator and hold the heat gun on the thermostat housing.... with the engine running of course.

 

[SandburRanch]

If in certain winter weather conditions you see a creamy white mucus looking build up on the dip stick and the filler cap underside you'll know what not operating at recommended temperature does. That's moisture build up in the oil from repeated operation under less than optimal temperature conditions.

 

[beenthere]

Derek
Ran across this link to a JD 730 recently sold at auction in IL.
How a John Deere 73 Can Command an Auction | Agweb.com

 

[DaninOhio]

Put the Gates thermostat in as Cat-Driver suggested for $40, that is what I did on my 70 gas. Still needs to be worked to come up to temp. My 70D warms up faster and has a lower temp stat (170).