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Small tractor question |
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Reed(UT)
Silver Level Joined: 14 Sep 2009 Location: Bluffdale, Utah Points: 151 |
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Posted: 28 May 2010 at 10:52am |
I have a small diesel tractor (32hp Yanmar) that started overheating on me. I cant figure it out. The radiator is fairly new and seems to be getting good flow. The water pump was replaced a couple hundred hours ago, and it still is tight, and the impeller looks good. I back-flushed the engine, and seemed to get good flow through it when I pushed water through it with a hose. The tractor has no thermostat. Fan belt is tight. Hoses don't seem to be collapsing. Oil doesn't seem to have any water in it, but could a head gasket still be gone?
I have had this tractor for years, and it only recently started heating up.
I have also checked the temperature with a hand-held thermometer, and verified it is indeed heating up. Anyone have any ideas? Thanks |
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2 WD45s, 190XT III, 72 AllCrop, Bunch of snap-coupler stuff. Looking for a B and CA
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Goose
Orange Level Joined: 07 Oct 2009 Location: Melrose, Wis Points: 2471 |
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Could it have gotten an air lock in it for some reason?
What was the coolant level before you drained and flushed it?
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Gatz in NE
Orange Level Joined: 11 Sep 2009 Location: Lincoln, NE Points: 1036 |
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Correct anitfreeze mixture?
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Reed(UT)
Silver Level Joined: 14 Sep 2009 Location: Bluffdale, Utah Points: 151 |
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I have tried a variety of coolant mixture ratios, right now it should be about 50-50, and made sure it is full.
Still overheats I am pretty sure it doesn't have an air lock in it, but will check this weekend. Edited by Reed(UT) - 28 May 2010 at 11:21am |
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2 WD45s, 190XT III, 72 AllCrop, Bunch of snap-coupler stuff. Looking for a B and CA
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Gatz in NE
Orange Level Joined: 11 Sep 2009 Location: Lincoln, NE Points: 1036 |
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50/50 should be right.
Do you see any white smoke in the exhaust ? If you could borrow a pump-up type tester or take it someplace that has one, that might tell you if there's a head gasket out or some other leakage problem.
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CTuckerNWIL
Orange Level Joined: 11 Sep 2009 Location: NW Illinois Points: 22818 |
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Radiators can get a solid cover of dirt on the outside that can pretty much stop all cooling capacity. Secially if they have paint on the fins. If the inside seems OK, the problem could be on the outside.
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http://www.ae-ta.com
Lena 1935 WC12xxx, Willie 1951 CA6xx Dad bought new, 1954WD45 PS, 1960 D17 NF |
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firebrick43
Orange Level Joined: 10 Dec 2009 Location: Warren County Points: 592 |
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I have seen a head gasket leak once or twice that pumps gas into the water jacket but coolant would not leak into the oil or cylinders. A pressure check guage on the radiator will typically show this. Also check the radiator cap to make sure it builds pressure to 5-7 psi.
I have also seen blocks plugged up from running creek water or something similar and also seen radiators/blocks plugged from mixing dexcool/lifetime coolant and standard glycol coolant. |
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Stan IL&TN
Orange Level Joined: 13 Sep 2009 Location: Elvis Land Points: 6730 |
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If the thermostat has been removed then you may want to install a new stat. As I understand it if too much flow is going through the radiator then the fluid will not have enough time to drop it's heat and the engine will over heat. Strange as it sounds.
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TramwayGuy
Orange Level Access Joined: 19 Jan 2010 Location: Northern NY Points: 11442 |
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Put a good thermostat back in. Almost all modern engines are bypass type, and without a thermostat, the coolant has no direction and will just circulate within the engine.
Secondly, make sure dust and debris is cleaned off the radiator. My small tractor is affected greatly by dirt on the outside of the radiator.
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Reed(UT)
Silver Level Joined: 14 Sep 2009 Location: Bluffdale, Utah Points: 151 |
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The tractor is about 30 years old, and has never had a t-stat (wasn't designed for one). The radiator is clean inside and out, too. I will pressure check the rad. as suggested and let you know what I come up with. I also checked the top of the radiator, vs the bottom, and there was about 20 degrees different, so I think I am getting flow through it.
What is crazy, is I used the tractor with a two-row planter this week and it never heated up (the load was very light). Could the block be partially plugged somewhere? |
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2 WD45s, 190XT III, 72 AllCrop, Bunch of snap-coupler stuff. Looking for a B and CA
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firebrick43
Orange Level Joined: 10 Dec 2009 Location: Warren County Points: 592 |
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Yes it could be. I have seen blocks plugged solid with mud/crap/rust. This is not typical though of engines used with antifreeze, but cheap owners that use bad tap or even creek water. If its been a long time though since the anti freeze has been changed the anti corrosion properties might have been exhausted and rust could be an issue. Remove a freeze plug and see? They are cheap to replace.
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Breeze
Orange Level Joined: 11 Sep 2009 Location: Ga Points: 8931 |
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Reed, seems like most of the yanmar tractors have plastic cooling fans. If it is plastic, have you checked it? Maybe wont run hot at idle or relatively low RPMs, but when revved up to working RPM or at least half throttle does it do it then? Sometimes the older plastic fans tend to slip when bad at higher RPMs. Had a problem with my ym2200 D getting hot, my pump was slipping and so was the fan. We had radiator cleaned, new cap and hoses, water pump replaced with new metal fan. No problems since. Hope it helps, good luck.
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robinson_trucking
Bronze Level Joined: 27 Feb 2011 Location: Roscoe, TX Points: 22 |
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That is correct! Having no thermostat will not let the coolant cool long enough in the radiator before recirculating back through the engine. Causing overheating problems !
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Kurzy
Orange Level Joined: 02 Nov 2009 Location: WSS, Montana Points: 808 |
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My manual says it has a factory thermostat!! I say check fan belt and take radiator out for good flushing.
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steve(ill)
Orange Level Access Joined: 11 Sep 2009 Location: illinois Points: 80239 |
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if there is no thermostat, what controls the temp ?
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Like them all, but love the "B"s.
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Brian Jasper co. Ia
Orange Level Joined: 11 Sep 2009 Location: Prairie City Ia Points: 10508 |
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Does it have a fan clutch? A radiator cap not holding pressure can cause it to boil in the engine and over heat. Thermostats aren't always in the outlet. If there isn't one there, it's in the inlet.
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"Any man who thinks he can be happy and prosperous by letting the government take care of him better take a closer look at the American Indian." Henry Ford
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CTuckerNWIL
Orange Level Joined: 11 Sep 2009 Location: NW Illinois Points: 22818 |
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With all the comments about overheating because of no thermostat, it makes me wonder how any tractors ever ran back in the 20's 30's and 40's when a lot of them didn't have thermostats or pressurized radiators.
If you take a bucket full of boiling water and dump it through a radiator that has a fan sucking air through it, the water will cool off no matter how fast it runs through the radiator. If there is build-up inside the radiator which causes minimal contact with the cores, it will cool less. If the outside is painted or covered with dirt it will also cool less. A thermostat is not in -place to slow the flow of the coolant through the radiator. It is there to stop the flow, until the coolant reaches a predetermined temperature.
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http://www.ae-ta.com
Lena 1935 WC12xxx, Willie 1951 CA6xx Dad bought new, 1954WD45 PS, 1960 D17 NF |
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dadsdozerhd5b
Orange Level Joined: 27 Sep 2009 Location: lansdale pa. Points: 527 |
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the thermostat is there to regulate the flow, stop it when it is cold and open when it is hot. as the engine heats up, the thermostat opens and closes alot until reaching operating temp. it also is restricting the coolant flow as the hole coolant flows by it is smaller than if it was not there. i suspect a bad thermostat. could also be the fuel injectors wearing and straight streaming instead of atomizing the fuel. does it smoke or lug at all?
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HD5B, HD5G, (2) FARMALL A's, CUB. DO IT RIGHT THE FIRST TIME, IGNORE THE LAUGHTER. FLANNEL IS ALWAYS IN STYLE.
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Russ SCPA
Orange Level Joined: 12 Sep 2009 Location: Southern Pa Points: 256 |
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Interesting place to look might be have you changed fuel filters? Or fuel blends? No possibility of having # 1 diesel blend? A diesel that is running lean will get HOT fast, esp under load.
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Stan IL&TN
Orange Level Joined: 13 Sep 2009 Location: Elvis Land Points: 6730 |
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Charlie we have global warming now. Way cooler back then. LOL
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1957 WD45 dad's first AC
1968 one-seventy 1956 F40 Ferguson |
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