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51 8N Engine Misfiring

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Oklahoma Dirt F

12-04-2004 10:00:38

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I"ve got a 51 Model 8N that won"t run smooth unless I pull the choke out about 3/4"s the way. It runs fully in but its rough, as you can tell by the engine sound. Any ideas on what it might be: I"ve replaced the plugs, points, coil, and fuel filter, drained out the gas now I"m scratching my head! Any ideas would be greatly appreciated!

Thanks,

Bill

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Dell (WA)

12-04-2004 13:50:42

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Re: 51 8N Engine Misfiring in reply to Oklahoma Dirt Farmer, 12-04-2004 10:00:38

Farmer..... .....you've done all the eazy stuff. Intake manifold leak is next eazy stuff, spray with WD-40, to stop leak.

But I gotta sneakin' hunch, yer gonna haffta go the next step and do the dreaded "compression test". Ford specs: 90 psi min (dry). Remove all yer sparkies. Do 5-puffs and writter down. Then give the sparkie-hole a squirt (1oz or tablespoon) of engine oil and dooer'gain. Writter down. No change wet or dry, burned exhaust valve. +10+20psi normal worn engine. +20+30 tired worn enging in need of rebuild. How the oilpressure? ..... ...Dell

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Bryan in WI

12-04-2004 10:36:35

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Re: 51 8N Engine Misfiring in reply to Oklahoma Dirt Farmer, 12-04-2004 10:00:38

Probably an air leak somewhere; that's why it smooths out when you give it more fuel (choke). If it isn't obvious, start spraying some WD-40 around and see if you can find it; if it is small it might smooth out when you spray the spot and that stops the leak for a sec. Don't start a fire, don't ask me how I know.

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Dan

12-04-2004 10:08:19

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Re: 51 8N Engine Misfiring in reply to Oklahoma Dirt Farmer, 12-04-2004 10:00:38

I can give you some hints, but if you put "runs rough" in the archive box and hit enter you will find pages and pages of solutions, as this is a common problem.

When I had a rough running problem on my 48 8N, I found it was a leaking manifold gasket sucking in extra air through the intake. Once I replaced this gasket, fixed the manifold with a file where the exhaust gasses had eaten into the metal, and put some JB Weld on the block and smoothed it out where it was eaten into as well - I could finally run my tractor without having to pin the choke back. Now it runs smoothly and will run rough if I do keep the choke on.

There are many other things it "could" be, and you can find a boatload of clues through the archive.

Good luck,
Dan

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