Small tractor question
Printed From: Unofficial Allis
Category: Allis Chalmers
Forum Name: Construction and other equipment
Forum Description: everything else with orange (or yellow) paint
URL: https://www.allischalmers.com/forum/forum_posts.asp?TID=13071
Printed Date: 26 Jun 2024 at 8:27am
Software Version: Web Wiz Forums 11.10 - http://www.webwizforums.com
Topic: Small tractor question
Posted By: Reed(UT)
Subject: Small tractor question
Date Posted: 28 May 2010 at 10:52am
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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 ------------- 2 WD45s, 190XT III, 72 AllCrop, Bunch of snap-coupler stuff. Looking for a B and CA |
Replies:
Posted By: Goose
Date Posted: 28 May 2010 at 11:01am
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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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Posted By: Gatz in NE
Date Posted: 28 May 2010 at 11:14am
| Correct anitfreeze mixture? |
Posted By: Reed(UT)
Date Posted: 28 May 2010 at 11:20am
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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. ------------- 2 WD45s, 190XT III, 72 AllCrop, Bunch of snap-coupler stuff. Looking for a B and CA |
Posted By: Gatz in NE
Date Posted: 28 May 2010 at 12:34pm
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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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Posted By: CTuckerNWIL
Date Posted: 28 May 2010 at 3:12pm
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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.
------------- http://www.ae-ta.com" rel="nofollow - http://www.ae-ta.com Lena 1935 WC12xxx, Willie 1951 CA6xx Dad bought new, 1954WD45 PS, 1960 D17 NF |
Posted By: firebrick43
Date Posted: 30 May 2010 at 9:52pm
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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. |
Posted By: Stan IL&TN
Date Posted: 04 Jun 2010 at 8:28am
| 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. |
Posted By: TramwayGuy
Date Posted: 04 Jun 2010 at 10:22am
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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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Posted By: Reed(UT)
Date Posted: 04 Jun 2010 at 10:34am
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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? ------------- 2 WD45s, 190XT III, 72 AllCrop, Bunch of snap-coupler stuff. Looking for a B and CA |
Posted By: firebrick43
Date Posted: 04 Jun 2010 at 12:12pm
| 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. |
Posted By: Breeze
Date Posted: 05 Jun 2010 at 10:35pm
| 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. |
Posted By: robinson_trucking
Date Posted: 05 Mar 2011 at 11:33pm
| 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 ! |
Posted By: Kurzy
Date Posted: 06 Mar 2011 at 7:30am
| My manual says it has a factory thermostat!! I say check fan belt and take radiator out for good flushing. |
Posted By: steve(ill)
Date Posted: 06 Mar 2011 at 8:48am
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if there is no thermostat, what controls the temp ? ------------- Like them all, but love the "B"s. |
Posted By: Brian Jasper co. Ia
Date Posted: 06 Mar 2011 at 1:48pm
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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. ------------- "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 |
Posted By: CTuckerNWIL
Date Posted: 06 Mar 2011 at 2:28pm
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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. ------------- http://www.ae-ta.com" rel="nofollow - http://www.ae-ta.com Lena 1935 WC12xxx, Willie 1951 CA6xx Dad bought new, 1954WD45 PS, 1960 D17 NF |
Posted By: dadsdozerhd5b
Date Posted: 06 Mar 2011 at 4:31pm
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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? ------------- HD5B, HD5G, (2) FARMALL A's, CUB. DO IT RIGHT THE FIRST TIME, IGNORE THE LAUGHTER. FLANNEL IS ALWAYS IN STYLE. |
Posted By: Russ SCPA
Date Posted: 06 Mar 2011 at 7:13pm
| 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. |
Posted By: Stan IL&TN
Date Posted: 07 Mar 2011 at 7:56am
Charlie we have global warming now. Way cooler back then. LOL ------------- 1957 WD45 dad's first AC 1968 one-seventy 1956 F40 Ferguson |
CTuckerNWIL wrote: