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Harry Ferguson Tractors Discussion Forum
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Hot Exhaust Manifold

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Ralph Newlon

10-16-2003 08:56:46




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I have a 1951 Ferguson TO-20. It runs fine but I noticed that the exhaust manifold gets hot enough to glow red (only visible after dark). Is this normal, and if not, what might be the cause? I thought it might be running rich and burning fuel in the manifold, but the owners manual says it will run hotter if the mixture is lean. Does this make sense?




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it is exhaust.

10-16-2003 19:58:55




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 Re: Hot Exhaust Manifold in reply to Ralph Newlon, 10-16-2003 08:56:46  
Ralph,Your pickup will do the same thing if you pull a load and pop the hood the manifolds will glow.



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Bob

10-16-2003 15:00:51




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 Re: Hot Exhaust Manifold in reply to Ralph Newlon, 10-16-2003 08:56:46  
I have to agree, if it's just a dull red that you can only see at night, especially if you've been working it for a while, it's probably OK. When I was a kid plowing at night with the old Super M of Grandpa's I'd light my stolen cigarettes on the manifold, which had a dull red glow to it. My Harley does it during a long hard pull on the interstate at night, and I've also seen it on a JD model 60. I wouldn't get my dress up over my head about it, but if you are worried, rich up the mixture a bit and maybe add a little timing.

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Jeff-oh

10-16-2003 11:01:55




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 Re: Hot Exhaust Manifold in reply to Ralph Newlon, 10-16-2003 08:56:46  
Ralph,

Before getting too excited, This may be normal operation. When you say glows red... that means a wide varity of things depending on if it a dull red to cherry bright red. As you say it is only visible at night I would suspect that it is the dull red.

Look down through the archives and you will see posts that discuss that some night time glowing is normal.



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Jerry/MT

10-16-2003 10:40:17




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 Re: Hot Exhaust Manifold in reply to Ralph Newlon, 10-16-2003 08:56:46  
Ralph, Increasiing the mixture richness will increase the charge cooling. What happens is that the liquid droplets of fuel evaporate in the warm intake air stream. It takes energy to chage the phase of the fuel from a liquid to a vapor and the source of that energy is the warm intake air. There are limits to how much of this charge cooling you can use because the cylinder mixture has to be in a rather narrow range of fuel/air ratios or it won't ignite. Regarding your problem, you need to fix it before you burn the exhaust valves. Make sure your timing is set right and the advance mechanism is working correctly. Look for air leaks around the intake manifold gasket and the carb to intake manifold gasket. Also look for cracks in the intake manifold. Squirting some light oil on these areas with the engine idling and looking for places where the oil gets sucked in can help you locate the leaks. Also make sure your main jet is adjusted properly. Hope this helps.

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Ray,IN

10-18-2003 06:10:28




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 Re: Re: Hot Exhaust Manifold in reply to Jerry/MT, 10-16-2003 10:40:17  
Excellent, concise reply Ralph! My TO30 never has exhibited a glowing manifold. I will add that Harry Ferguson tractors use the fuel mixture for additional engine cooling, requiring a slightly rich fuel mixture of the power jet(see owners manual). This causes the engine to run rich at idle and unloaded engine conditions with the accompanying black exhaust.



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R. Marg

10-16-2003 10:13:48




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 Re: Hot Exhaust Manifold in reply to Ralph Newlon, 10-16-2003 08:56:46  
I don't know much about your type of tractor but I do know from other machines it sounds like you have a timing problem I'd check your timing it may have jumped timing or the disturbor has turned a little on you



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Jim W

10-16-2003 14:05:19




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 Re: Re: Hot Exhaust Manifold in reply to R. Marg, 10-16-2003 10:13:48  
Running with timing retarded can result in fuel burning on the way out the manifold. I am fighting the same problem right now and if I get it resolved this weekend I will post back as to what solved it.
Jim W



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john(UK)

10-16-2003 15:17:51




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 Re: Re: Re: Hot Exhaust Manifold in reply to Jim W, 10-16-2003 14:05:19  
If its running ok and has plenty of power I shouldn't worry too much...for a manifold or exhaust to glow dull red in the dark isn't too unusual. NOw if it is running rough and down on power you need to check things out.



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R.Marg

10-16-2003 19:41:56




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 Re: Re: Re: Re: Hot Exhaust Manifold in reply to john(UK), 10-16-2003 15:17:51  
that is true if it isn't getting hot does it have a temp guage if it runs hot worry if not run it



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TO24424

10-17-2003 17:52:54




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 Re: Re: Re: Re: Re: Hot Exhaust Manifold in reply to R.Marg, 10-16-2003 19:41:56  
Sorry, but I have to put in my 2 cents worth. With automobiles,ie Triumphs, which are similar engines, the manifold glows when the timing is retarded or the mixture is over rich. The glow is caused by the manifold being the hot point after the combustion chamber and burning the excess fuel. This is similar to a chimney fire in a house with creosote inside the chimney. I would check the state of tune of the engine.

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