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Overheating problems

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Allen

06-21-2000 08:51:57

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I have just finished rebuilding a n8 motor from the ground up. It has been a very enjoyable project. Last week I started it up and every thing is working well except for the cooling system is overheating. Under a load, the cooling fluid will overheat in about 15 min. I have already checked the timing, blocked radiator, water pump, fan blade, and thermostat. One of my friends told me that this is normal for a newly rebuilt motor because everything fits snug and it is caused by friction. The questions that I have is this a true statement and if so how long will it last. Thanks for any help.

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JK_TN

06-23-2000 12:46:00

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Re: Overheating problems in reply to Allen, 06-21-2000 08:51:57

Low oil will also contribute to overheating. I've seen it happen...not on MY tractor, of course. :)

--JK_TN

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Allen

06-21-2000 15:25:50

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Re: Overheating problems in reply to Allen, 06-21-2000 08:51:57

Thanks for all your help. I will check out the 8n based on your suggestions and get back on the board this weekend.

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Dell (WA)

06-21-2000 15:13:07

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Re: Overheating problems in reply to Allen, 06-21-2000 08:51:57

Allen..... .I see Marc has remembered my "confession" about installing the upper radiator hose thermostat bass-ackward. I'd swear, I installed it just like the I&T FO-4 picture (which is not to clear), but the tractor overheated and blew out all kinds of water out the radiator input. I had the cap off, checking for when the top water got warm. I turned off the tractor and "thar' she blows!" Latent heat from the cylinders turned to steam which expanded and actually pushed the water out the water pump and up through the bottom of the radiator and out the top of the radiator.

I'd do encourage the use of a thermostat as the N-Tractor has a really good cooling system and you need to get the engine oil hot to burn/evaporate off contaminates. Otherwize, you laydown a thick layer of sludge in the bottom of the engine. The carb really needs some heat also, to make the engine idle good. Hope this helps..... Dell

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Steve IA

06-21-2000 14:41:35

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Re: Overheating problems in reply to Allen, 06-21-2000 08:51:57

Are you sure it's over heating and not just overflowing? You have to leave a couple of inches of air room below the radiator cap or the coolant will expand and overFLOW. I hope this is all it is. Steve #169302

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Nolan

06-21-2000 10:30:58

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Re: Overheating problems in reply to Allen, 06-21-2000 08:51:57

A classic example of how a little bit of knowledge can be a dangerous thing. Your friend's premise is based on truth. A new engine is tight, and does have higher friction, and does generate more heat as a result. But your friends conclusion, that this is the cause of your overheating, that's wrong. The heat increase from the higher friction is very slight. Even if you did the engine flat wrong, the heat from this friction still isn't tremendous, and would never overwhelm the cooling system of these tractors.

So, start with determining and clarifying to us how you're determining your overheating. Then lets go through the system with descriptions. As in how you've determined the water pump is working correctly, that the thermostat i working correctly, etc.

Remember too, a radiator does not have to be blocked to cause overheating. A nice insulating layer of slime and scale on the inside of the tubes will prevent heat transfer, overheating the engine.

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Marc(MO)

06-21-2000 09:12:39

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Re: Overheating problems in reply to Allen, 06-21-2000 08:51:57

I have never heard of an engine overheating because it was new. I would take off the radiator cap and see if the water is circulating through the radiator. Does the radiator get hot along with the engine? Try running it without a thermostat. Is the thermostat in backwards? I think I remember Dell(WA) telling us how he put his thermostat in backwards and his tractor overheated.

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Marc(MO)

06-21-2000 09:08:00

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Re: Overheating problems in reply to Allen, 06-21-2000 08:51:57

I have never heard of an engine overheating because it was new. I would take off the radiator cap and see if the water is circulating through the radiator. Does the radiator get hot along with the engine? Maybe the thermostat is in backwards. I think I remember Dell(WA) telling us how he put his thermostat in backwards and his tractor overheated.

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llamas

06-21-2000 09:05:22

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Re: Overheating problems in reply to Allen, 06-21-2000 08:51:57

What you have been told is a bunch of baloney.

What are the symptoms of "overheating? Have you hung a thermometer in the radiator to determine just how hot the water is getting?

llater,

llamas

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