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Glowing manifold

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Robert

05-30-2003 03:58:22

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Hi all, just bought myself a 8n with a 5 ' mower, runs great, but the other day, (late in the day) I was mowing my 8 acres, I mowed right up and into dark, that's when I noticed the manifold was cherry red, WOW !, is this normal?? Also how many hours do you guys get out of a full tank of gas?, I seem to use more than I think I should.

thanks

Robert

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2fordsmike

05-30-2003 11:32:32

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Re: Glowing manifold in reply to Robert, 05-30-2003 03:58:22

Plowing at night with our gas tractors in the 1950s and 60s it was common to see a dull whiteish glow coming from the exhaust pipes, particularly on tractors with vertical exhaust. But I never saw one glow red hot and I don't recall seeing the glow on the exhaust manifold and I looked for such things. Tell you what, after you see that glow you will be less likely to turn off a hard-working engine until it has cooled down a bit to prevent warping of the super-heated engine parts Mike-Iowa

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RoN of ohio

05-30-2003 11:24:15

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Re: Glowing manifold in reply to Robert, 05-30-2003 03:58:22

One other comment that I might make, is to be sure to use only 87 octane fuel. Higher octanes are less explosive in these lo-compression engines and just might be responsible for the 'late' burn taking place in the exhause manifold. Just my opinion

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Pete

05-30-2003 06:58:43

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Re: Glowing manifold in reply to Robert, 05-30-2003 03:58:22

Robert --

I concur with what our fine colleagues have said about your glowing manifold -- something wrong, but certainly fixable via adjustment.

I can add that, with my 9N running a 5 ft brush hog even if I don't keep up with the grass like I should and she has to run for all she's worth I still get about 5 or 6 hours run time without going into the reserve (about 8 to 9 gal. I believe.) I can't imagine an 8N getting significantly different fuel efficiency.

Best regards,

Pete

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Mike

05-30-2003 05:28:50

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Re: Glowing manifold in reply to Robert, 05-30-2003 03:58:22

Robert, NEVER should a 8N glow cherry red!!! I have worked with and on 8N's since I was about 8 yrs old. Your timing is off and your carb could use a little adj. But the timing is important. That will make a big difference. I have seen exhaust pipes glow but not a manifold. Have a good mechanic check the timing and set according to the 8N Ford manual specs. Good luck with a fine little tractor.

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ZANE

05-30-2003 05:27:12

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Re: Glowing manifold in reply to Robert, 05-30-2003 03:58:22

Ignition along with carburetor high speed needle settings both have a lot of significence in both the fuel consumption and the glowing manifold.

If the ignition settings are not correct this can cause the manifold to be over hot. If the ignition is timed so that it is firing a lot too late on the power stroke it can be allowing a still burning mixture to be expelled into the exhaust manifold causing overheating of the exhaust. This can also contribute to overusage of fuel by a large amount.

Usually too lean a mixture will contribute to the hot exhaust and not the too rich mixture.

I would look at the ignition timing.

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normal . . . Dell (WA)

05-30-2003 04:24:30

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Re: Glowing manifold in reply to Robert, 05-30-2003 03:58:22

Robert..... ..dull red glowing exhaust manifold is normal, you just never see it in daylite or look under your automobile hood after running 100 mph (grin).

Usually, I get about 2 gal/hr operation. 10 gal gas tank including 1 gal "reserve" position on fuel shut-off valve under tank..... ....Dell

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Robert

05-30-2003 04:36:18

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Re: Re: Glowing manifold in reply to normal . . . Dell (WA), 05-30-2003 04:24:30

Thanks. Well, I must have a problem then, I'm useing alot more gas than that and I mean alot more!, carb time? My exhaust manifold was really, really red, I could even feel the heat from that side of the engine, still ok?, if not , any ideas?

Thanks for the quick help

Robert

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Dell (WA)

05-30-2003 05:03:28

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Re: Re: Re: Glowing manifold in reply to Robert, 05-30-2003 04:36:18

Robert..... ..NO, its NOT carb rebuild time, adjust time, maybe.....

1st, read your sparkies, the ceramic insulator tip should be a light tan to light gray. Soft BLACK sooty is sure sign of over rich mainjet.

2nd, I usually just set the mainjet to 1 1/2 turns and leaveitt. And as long as engine has enuff power to do the job, its probably in the ballpark.

3rd, idle mixture is adjusted for MAX idle rpms, NOT idle smoothness, MAX IDLE rpms. BTW, 8N's idle spec is a very slow 400 rpms. I'm happy with anything under 500 rpms.

OR you could put the tractor on a PTO dynomometer and adjust for max HP like they do for big tractors. This can significantly effect your fuel/hr consumption and if'n yer plowing hundreds of acres per day with some of those multi-tired tractor monsters, can make or break your bottomline profit.

Out in the open tractor gutts and heat from both radiator and exhaust manifold can be disconcerting as compaired with your experience with automobiles where everything is hidden under the hood..... ..... Dell

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Jim(FL)

05-30-2003 05:03:14

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Re: Re: Re: Glowing manifold in reply to Robert, 05-30-2003 04:36:18

Robert, I agree on both points with Dell. I have a newly rebuilt engine, and bushhogging (light duty) with a 5 footer for 3 1/2 hours will usually use 5 to 6 gals of gas. IF YOU THINK YOU ARE RUNNING A RICH FUEL MIXTURE, this would actually "cool" the exhaust manifold due to the extra fuel in the system. However, it may be worth your time to be very sure of your dist. timing. This can cause both your symptoms. I'm not sure here (and I'm sure someone else on the board can either back me up or correct me), but I think a retarded timing will cause both "poor" fuel economy and a hotter than normal exhaust. Kind of like - combustion still occurring during the exhaust stroke and the still burning mixture heating up the exhaust manifold. I think??

Board HELP US OUT HERE!!!!!

Jim

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Patrick Thomas

11-30-2006 11:31:34

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Re: Re: Re: Re: Glowing manifold in reply to Jim(FL), 05-30-2003 05:03:14

Timing is the problem.
I am working on a friend's 8N and he had the same problem and it got so hot it blew out the manifold gasket.
What I found was the points were so worn that there was barely any gap so needless to say the timing was way off. So the weak spark combined with the late timing caused by the excessive dwell causes alot of unburned fuel to accumulate in the manifold.

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