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8N over heat

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1950_8N Super D

08-25-2006 14:16:39




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Well, Here we go again. I replace my radiator,thermostat, flushed the system, refilled with 50/50. Filled it up to the neck. Once the tractor warms up it comes out the overflow for a while. Once the Thermostat warms up, it blows out for a second to release pressure from the block. Once I let it cool down to check the level, you can barely see a level in the rad. I removed the thermostat,I start the tractor and you can observe flow. Am I over filling the rad. The book & ford rep is not clear on the thermostat position or direction. They tell me that the pointed end should face the rad. Is this correct ? Should I just leave out the Thermostat.

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Ross Pugh(NC)

08-25-2006 16:53:38




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 Re: 8N over heat in reply to 1950_8N Super Dave, 08-25-2006 14:16:39  
Normal, Dave, nothing unusual. You are over filling the radiator. Excess is overflowing, all you need is to just cover the insides of the radiator. Normal , SOP(Standard Operating Procedure)



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RP-40-9n

08-25-2006 16:25:39




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 Re: 8N over heat in reply to 1950_8N Super Dave, 08-25-2006 14:16:39  
dave, sounds like youve done everything about and im srarting to think -head gasket- head-or block problem. fill the radiator up to where you can see the water good, srart her up and watch the water to see if any air bubbles are comming to the top. also look for oil in your water, either one of these show up you will have to look a little deeper head,gasket block. RP



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Stumpalump

08-25-2006 15:13:24




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 Re: 8N over heat in reply to 1950_8N Super Dave, 08-25-2006 14:16:39  
Let it run for a while to get it good and warmed up. Then you should be able to hold your hand on the block for 4 seconds befor you go ouch! 2-3 seconds its running hot, more is cold. Yes this is acurate and you can practice with a known good engine. Themostats are worth the trouble they help burn off gas and moisture in the oil. I allways change a thermostat if I flush an engine or I will be back in it.

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Bruce (VA)

08-25-2006 15:02:51




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 Re: 8N over heat in reply to 1950_8N Super Dave, 08-25-2006 14:16:39  
Yes, you are overfilling it. Add just enough 50/50 to cover the core. The last time I had the radiator off of the 50 frontmount, I measured it: 11 quarts, not the 12 that it can hold. And, do not remove the thermostat. No thermostat results in a cool running engine, which means uneven wear & acidic sludge build up in the oil; not a good thing for your bearings. The pointed end goes toward the radiator.

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LeeMo

08-25-2006 14:33:50




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 Re: 8N over heat in reply to 1950_8N Super Dave, 08-25-2006 14:16:39  
I run mine without a thermostat. I've had a number of old N tractor guys tell me they cause more trouble than they're worth although many on the boards seem to think they're needed. The top tank of the 8N radiator is an expansion tank and there should be at least a couple of inches between the water level and the neck. As long as the top of the tubes are covered it should be enough water. It does sound like you're overfilling it. I don't recall which way the pointed end should be placed cause I don't use one. It sounds like from what you've done your tractor should run nice and cool.
Good Luck, Lee

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Bruce (VA)

08-25-2006 15:09:05




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 Re: 8N over heat in reply to LeeMo, 08-25-2006 14:33:50  
Lee, for what it's worth, I had a Ford tractor dealer tell me a few years ago that I had a cracked block because water came out when I removed a manifold stud (this board got me straight real quick) and two local real farmers, very nice guys, who owned N's as their first tractors, tell me that I needed to convert mine to 12v or they would never start in the winter. These guys are friends & neighbors, and old as dirt, so my response is always 'thank you for the advice.' If old equals smart, I'm a genius!

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Dean Shead

09-30-2006 10:46:11




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 Re: 8N over heat in reply to Bruce (VA), 08-25-2006 15:09:05  
Bruce, I was looking at the forum and saw that you had the same problem that I seem to face. When I removed the bolts from the intake/exhaust manifold on my 8n water came out the bolt holes. If you don't mind sharing the info, what did the others tell you about this?



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Roger in Iowa

08-25-2006 14:33:29




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 Re: 8N over heat in reply to 1950_8N Super Dave, 08-25-2006 14:16:39  
Sounds like you are overfilling it to start with. You have to leave some room for expansion.

Drill an 1/8" hole. if it doesn't have one, so some water (hot) can circulate by the thermostat all the time. This will prevent the "blow" when the thermostat opens as it will open gradually as it should. It was really bad on my JD 4400 Diesel combine as the thermostat was a long ways from the cylinder head and hot water.

Do not leave the thermostat out. Once it overflows see what the level is (after cooling) and leave it there.

Roger in Iowa

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