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Ford 9N, 2N & 8N Discussion Forum
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hole in manifold damaging valves???

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71powerking

10-10-2007 19:08:45




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The 2n I just got running has about dime sized hole in the manifold about an inch or two from where the exhaust pipe clamps to it. This doesn"t bother me, and I didn"t think anything of it, but someone told me not to run it until I plug the hole because I"ll damage the exhaust valves. I can"t see how, but thought I would ask some of you guys before I call this guy a moron (he is my cousin after all.)

BTW- thanks for all the great info! It was invaluable. I think I know more about the N series tractor now than I know about myself. :P

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Jerry/MT

10-11-2007 20:51:58




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 Re: hole in manifold damaging valves??? in reply to 71powerking, 10-10-2007 19:08:45  
As long as the intake part of the manifold is not leaking, your valves should be fine. A intake mainfold leak leans the mixture and makes the exhaust valves run hot. (Also makes for crappy running!)
A leaking exhaust manifold gasket will erode the machined face on the engine and the manifold so it should be repaired asap. But a hole in the exhaust manifold, besides making a racket, won"t hurt anything unless hot exhaust gasses impinges on some other part.

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71powerking

10-11-2007 14:09:33




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 Re: hole in manifold damaging valves??? in reply to 71powerking, 10-10-2007 19:08:45  
Thanks. I was thinking of just JB welding it, if that would hold up to the heat. Never used the stuff before. Would like to knock the decibels down a peg or two.



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gshadel

10-11-2007 15:36:42




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 Re: hole in manifold damaging valves??? in reply to 71powerking, 10-11-2007 14:09:33  
JB Weld won't last in that application, it's too hot. You might have luck, for a while, with exhaust repair, or furnace repair goop. But I doubt that will last for any substantial period of time.

George



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soundguy

10-11-2007 06:49:57




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 Re: hole in manifold damaging valves??? in reply to 71powerking, 10-10-2007 19:08:45  
If there's any 'meat' aroud the hole.. hog it out just enough to take a big pipe plug, and screw er in... ( don't get carried away.. just use the next largest size plug to fit the hole. if there is enough metal to hold it.. etc.. )

Soundguy



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ZANE

10-11-2007 06:39:32




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 Re: hole in manifold damaging valves??? in reply to 71powerking, 10-10-2007 19:08:45  
Not true! I ran my old TO 20 Ferguson for 40 years with nothing but the #1 exhaust port of the exhaust manifold even existing and never had a valve problem. Hearing problem yes!

I did finally put a new manifold on it once I quit using it to rake hay????

I just wired a piece of sheet tin over the manifold so it could't boil the gas in the tank and kept of trucking.

The great radial engines of WW2 plus the V12s in airplanes never had anything but a short stubby pipe to keep from meling something on the plane.

Zane

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Bruce (VA)

10-11-2007 05:14:08




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 Re: hole in manifold damaging valves??? in reply to 71powerking, 10-10-2007 19:08:45  
I was told 40+ years ago that the reason you needed to plug the headers on drag cars after the run was to keep the cold outside air from warping the hot exhaust valve stems when the engine was turned off. My knowledge of thermodynamics is pretty much limited to recognizing the boiling point of water, so I'm not going to be able to offer a competent response to the question.

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Gregg E

10-10-2007 20:15:49




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 Re: hole in manifold damaging valves??? in reply to 71powerking, 10-10-2007 19:08:45  
Wont hurt a thing, you might want to try and weld it shut. A good welder could puddle it closed for you.



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Bob

10-10-2007 19:14:27




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 Re: hole in manifold damaging valves??? in reply to 71powerking, 10-10-2007 19:08:45  
Vlave damage from something like that is 99.9% an "old wive's tale".



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Dunk

10-10-2007 19:14:19




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 Re: hole in manifold damaging valves??? in reply to 71powerking, 10-10-2007 19:08:45  
There is this old "myth??" from the hot rod days, that running one without a manifold will warp the exhaust valves.

Is it true?

Ell I don't know....



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