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8N Boils Over

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Ken Brading

04-09-2001 14:23:00




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I'm using a 1952 8N to mow my hillsides and I have to run it at full throttle in first gear. After a period of mowing, it vents the radiator contents through the vent tube. The engine was rebuilt a few hundred hours ago and I don't know the condition of the thermostat. I know there's a problem with the fit of the radiator cap (4 lb. cap is original equipment)and the neck on the top tank, and I think that interface is the problem. However before diving into fixing that problem, I was wondering if boiling over at full throttle is common in old 8N's?

Ken Brading

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Fast Ed Ohio

04-09-2001 20:50:38




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 Re: 8N Boils Over in reply to Ken Brading, 04-09-2001 14:23:00  
Look at the front of the radiator to make sure it is not plugged. ( dry grass exc. )



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Danny in CO

04-09-2001 14:34:45




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 Re: 8N Boils Over in reply to Ken Brading, 04-09-2001 14:23:00  
How long have you had the tractor? If new to you, check for a thermostat by feeling the top raditor hose. If it has one, it could be in backwards. The pointed end should go towards the raditor. The N's were over cooled and it would take a lot to over heat it.

It could be a bad water pump also.

Danny



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Ken Brading

04-09-2001 14:51:42




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 Re: Re: 8N Boils Over in reply to Danny in CO, 04-09-2001 14:34:45  
Thank you.
My neighbor is kind enough to loan me the tractor, and I wasn't in on the rebuild but she's savy enough to get it back together correctly. I guess you might say I obsess over it operating correctly, but I would hate to damage it by not paying attention to all the obvious signs.

Over cooled was the information I'm looking for. Fixing the problem is minor, I just wanted to make sure it has a problem. If it isn't broken don't fix it.

By the way, since it's a 1952 vehicle, I'm sure it's not the original radiator and problems we've had with OE caps leads me to believe it's not an OE radiator. Do you have any tips about replacement radiators? Like using a Ford Falcon radiator or something that was common to other vehicles? If not, can you recommend an OEM?

Thank you,
Ken Brading

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Jimp CO

04-09-2001 14:28:38




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 Re: 8N Boils Over in reply to Ken Brading, 04-09-2001 14:23:00  
How full are you filling the radiator?
It will spit out whatever it dosen't want.
Just over the top of the core is where the water should settle.



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Ken Brading

04-09-2001 14:35:35




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 Re: Re: 8N Boils Over in reply to Jimp CO, 04-09-2001 14:28:38  
I fill it as full as I do an automobile radiator, about an inch or so below the bottom of the fill neck on the top tank. Why would an 8N be different?

Ken Brading



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Steve IA

04-10-2001 09:26:33




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 Re: Re: Re: 8N Boils Over in reply to Ken Brading, 04-09-2001 14:35:35  
Try what Jimp CO says. If I can touch the water in my radiator stretching my finger as far as I can, that's too much. Cover the core and try it. Steve 8N 169302



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Jimp CO

04-09-2001 14:49:07




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 Re: Re: Re: 8N Boils Over in reply to Ken Brading, 04-09-2001 14:35:35  
It is a very low pressure system and needs (for some reason) more area of the tank to expand? or hold the hot water/steam?.,
These really run cool. Why don't you, not fill it and just make sure that the core is coverd and run it. I think you will find that it dosen't "boil over" anymore.
good Ning.



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