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Ford 9N, 2N & 8N Discussion Forum
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2N fouling #3 sparkplug

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GB in MT.

04-16-2007 15:15:22




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My 2N has been fouling #3 plug. About every 30-35 hrs, I have to change the plug. Decided to chk. it out today. All the sparkies are bright. The gap is good, on the points. So I did a compression chk. with my brand new tester. They go as follows: DRY: 1=90; 2=90; 3=89.5; 4=90.
WET: 1=98; 2=97.5; 3=95; 4=98.
What do you think?? I'm thinking #3 piston has a valve seat leaking. Besides needing new rings all around!!???

OK, your turn, tear me up!!!!


Gary

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mad farmer

04-17-2007 08:40:40




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 Re: 2N fouling #3 sparkplug in reply to GB in MT., 04-16-2007 15:15:22  
On my N #1 fouls first as it seems to be the last to warm up and I'll replace it 3-4 times as much as the others, especially if I don't let it warm up enough in cold weather.

I'll agree with maybe having a stuck oil ring on #3. Another thing to check is plug wire on #3 and/or dist cap for #3. If you've got solid wires should have no resistance, and no carbon tarcks around #3 on cap.



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GB in MT

04-17-2007 09:33:57




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 Re: 2N fouling #3 sparkplug in reply to mad farmer, 04-17-2007 08:40:40  

You may have just hit on something. I have what appears to be the orig. plug wires, (can't be)but older solid wire cored. If #3 wire was cracked/split, and was arching, or touching somewhere on the metal harness tube after installing to the plug, that plug would not get full spark thereby fouling could occur.
I think that may be the problem, as this fouling did not start until soon after I installed new al 437's in Nov. 2006. Maybe I cracked #3 plug wire. They are pretty old and brittle.
I'll let you know what I find.


Gary

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Danny in CO

04-17-2007 08:19:18




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 Re: 2N fouling #3 sparkplug in reply to GB in MT., 04-16-2007 15:15:22  
GB,

There are 2 types of pistons used in these old Ns: a 3 ring variety and a 4 ring variety. In either case there is only one oil ring (actually 3 rings in one groove). The other rings are for compression. If your oil ring fails you can still have decent compression. From your description I suspect your oil ring(s) on #3 are bad allowing oil past them and fouling the plug. You can try increasing the plug gap slightly to see if that will help. Long term solution in new rings.

Good luck,
Danny

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GB in MT.

04-17-2007 06:58:06




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 Re: 2N fouling #3 sparkplug in reply to GB in MT., 04-16-2007 15:15:22  

OK GUYS, remember what I said about thinking you were all mind readers?? New AL437's installed, new points first of this mo. installed. New spark plug wires ready but not installed yet, New coil installed 5 mo. ago. I chkd. sparkies yesterday, real good spark through plugs. Also chkd. gap on points. .015 right on.

Chkd. FO4 says my symtems could be worn rings or sticking valve or a combo. of both!!!

I've read the archives, and been watching the NET posts, and yes I agree that 90-98 on the compression is not terrible, BUT the problem is still there. Seems to me that if it were carb. problem, it would be fouling all the plugs, not just one.

Thanks for all the help.


Gary

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souNdguy

04-17-2007 06:25:44




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 Re: 2N fouling #3 sparkplug in reply to GB in MT., 04-16-2007 15:15:22  
I'm with DH.. 90 all around dry and about 95 wet ain't bad numbers.

I'd check my plug types and if not al437's.. I'd try them and see what I got.

If not using copepr core wires.. i'd switch them out too.

Soundguy



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GB in MT

04-16-2007 16:51:04




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 Re: 2N fouling #3 sparkplug in reply to GB in MT., 04-16-2007 15:15:22  
Naw, I didn't think the valve could leak oil. what I'm thinking is, the #3 piston ring is doing that. I was talking about the valve becase of the low compression test on #3. That and the fact that the rings are due. Guess I ought to learn to make myself better understood. I thought you guys were all Mindreaders. {:-)


Gary



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A. Bohemian

04-16-2007 16:41:44




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 Not You, the Engine! in reply to GB in MT., 04-16-2007 15:15:22  
Wait, if I read your post right, you think the oil fouling the plugs is perhaps coming from a valve?

Remember this is not an overhead valve engine. Oil from the valve train COULD get past a bad valve and seat, I guess, but I don't know if it would do so in the quantity you describe.

I still think you need a rebuild. Your compression readings may not look THAT bad, but I've seen cracked rings, for example, pass a compression test but fail under load.

Meanwhile, back at the valves; if you're going to do the rings, consider doing the valves at the same time. You're going to have everything apart anyway, and on an older vehicle like this, it makes little sense to do half a rebuild.

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dave guest

04-17-2007 19:58:37




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 Re: Not You, the Engine! in reply to A. Bohemian, 04-16-2007 16:41:44  
Could be plug wire. Especially if using carbon or graphite wire. You really want copper. Sometimes the crimp is loose. Check with meter and wiggle the ends.



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GB in MT.

04-16-2007 19:52:58




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 Re: Not You, the Engine! in reply to A. Bohemian, 04-16-2007 16:41:44  

Thanks for the comeback A.B. I really appreciate the help. Looks like I'll be doing a rebuild as soon as I can afford it. I'll just have to live with it until then.

Thanks again.

Gary



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dan hill

04-17-2007 05:46:09




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 Re: Not You, the Engine! in reply to GB in MT., 04-16-2007 19:52:58  
Slow down,A half pound dosent mean any thing.You may be running the wrong heat range on your spark plugs.Do you have a thermostat in the top hose.Ford tractors have gone from H10 to H12 on Champion plugs .I use autolite plugs,wont use Champions .They gas foul on cold startup.Put an Autolite 437 in #3 cylinder and see if the fouling stops.I had a 38 Ford that had just 40 pounds on all cylinders.I sold it to a friend who liked to race with early 50s Fords.None of them could pass the 38.Check into Aldor spark plugs on the internet.They make plugs that will fire in worn engines that are pumping oil.

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A. Bohemian

04-17-2007 06:30:16




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 Why Not? in reply to dan hill, 04-17-2007 05:46:09  
Quote: "A half a pound does not mean anything."

I agree. Everyone who knows how to use compression tests as a diagnostic tool knows that.

However, what I said was, "Your compression readings may not look THAT bad, but I"ve seen cracked rings, for example, pass a compression test but fail under load."

Trying a different plug might work, allowing GB to delay a rebuild by some indeterminate amount of time.

But it will only mask the symptom, not cure the problem.

And, I"m fairly confidant one day relatively soon number three will miss all the time, even with NEW plugs...

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dan hill

04-19-2007 01:44:21




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 Re: Why Not? in reply to A. Bohemian, 04-17-2007 06:30:16  
If an Aldor plug or an anti fouler would keep the tractor working ,Why not? This tractor could have a junk carbon core wire on it.An ohm meter test would spot this problem.Carbon core wire runs 10000 ohms per foot normally.



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