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Farmall & IHC Tractors Discussion Forum
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300u P or NP?

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JayWalt

10-16-2006 23:26:43




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Is the 300u with a c169 engine pressurized or non? There is a pressurized cap on it, however when i got it it was about 2 inches from the fill neck, and when I filled it up, it came out near the top of the radiator after I ran it for a bit? Either the system is pressurized and the caps gasket is shot, letting it go right out the vent tube, or it is a nonpressurized system and im overfilling it.
Thanks for the help.

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JayWalt

10-17-2006 05:53:41




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 Re: 300u P or NP? in reply to JayWalt, 10-16-2006 23:26:43  
Thanks guys!! =)



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williamf

10-17-2006 02:42:28




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 Re: 300u P or NP? in reply to JayWalt, 10-16-2006 23:26:43  
Hugh's right again.
Pressurized or not, you can't fill a radiator all the way to the top cold (new-fangled with reservior bottles on the side don't count) and have it not overflow when hot. The liquid expands when heated and nothing we or a radiator cap can do is going to stop it. It's incompressible and needs the compressible air at the top to expand against.
My rule of finger is check when cold, stick middle finger in the neck, finger tip should just touch the coolant.
Good luck, Wm

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Hugh MacKay

10-17-2006 03:07:53




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 Re: 300u P or NP? in reply to williamf, 10-17-2006 02:42:28  
william: Good mearuring stick, your finger must be same length as mine.



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Hugh MacKay

10-17-2006 00:04:22




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 Re: 300u P or NP? in reply to JayWalt, 10-16-2006 23:26:43  
Jay: It's presurized, and you are over filling. 300 probably 2.5" from top of rad.



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Wes in Ohio

10-16-2006 23:42:17




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 Re: 300u P or NP? in reply to JayWalt, 10-16-2006 23:26:43  
It is a pressurized system



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