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Ford 9N running on 3 cylinders ?


 
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RD58
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PostPosted: Thu Nov 07, 2019 7:07 pm    Post subject: Ford 9N running on 3 cylinders ? Reply to specific post Reply with quote

Hi all, I am pretty new to the ford tractor and I?m having an
issue with low power on acceleration and overall bad running.
I have already rebuilt the carb and the previous owner put all
new ignition on (I bought the tractor only a few months ago). I
have since cleaned the points and the distributer even though
they are new and double checked firing order. This thing has
me stumped. It?s got 88 psi compression which is ok by the
manual I have. The very odd thing I have found is that 3 of my
spark plugs appear rich and carboned up and one appears
clean and white. (See attached picture)

Any ideas or help on this issue will be greatly appreciated

Thanks in advance


 
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Eman85
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PostPosted: Thu Nov 07, 2019 9:34 pm    Post subject: Re: Ford 9N running on 3 cylinders ? Reply to specific post Reply with quote

Did you check compression on all 4 cylinders? Is any of the coolant missing? 1 clean plug is usually coolant in a cylinder steaming the plug clean.
 
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Tomatoboy
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PostPosted: Fri Nov 08, 2019 6:12 am    Post subject: Re: Ford 9N running on 3 cylinders ? Reply to specific post Reply with quote

You checked compression and got 88psi for all four cylinders, or the cylinder that clean plug came out of has 88psi compression? That plug is suspiciously clean and I concur it looks steam cleaned like you get when coolant is inside a cylinder due to something like a head gasket issue. Check compression on all four cylinders, and check for missing coolant and muddy milkshake oil, and report back.
 
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RD58
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PostPosted: Fri Nov 08, 2019 9:05 am    Post subject: Re: Ford 9N running on 3 cylinders ? Reply to specific post Reply with quote

CVPost-Tomatoboy wrote:
(quoted from post at 07:12:30 11/08/19) You checked compression and got 88psi for all four cylinders, or the cylinder that clean plug came out of has 88psi compression? That plug is suspiciously clean and I concur it looks steam cleaned like you get when coolant is inside a cylinder due to something like a head gasket issue. Check compression on all four cylinders, and check for missing coolant and muddy milkshake oil, and report back.


Thanks guys for the reply s. I should have clarified in the original post I got roughly 88 psi on all 4 cyl. The oil is a bit dirty but didn t have water on the dipstick and is not milkshake colored. I will drain the oil today to double check this and report back.

Thanks again
 
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Jim L WA
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PostPosted: Fri Nov 08, 2019 9:37 am    Post subject: Re: Ford 9N running on 3 cylinders ? Reply to specific post Reply with quote

The first thing I would do, is check the clean plug to see if it's good. Lay it against the head with the wire that it came from hooked to it and with the key on turn the engine over and look for a spark to jump the gap. What you want to prove is, that the plug and the wire is good. If you don't get a spark, then move it to another wire and or try one of the other plugs on that same wire. Let us know the results.
 
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Farmer Dan
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PostPosted: Fri Nov 08, 2019 9:41 am    Post subject: Re: Ford 9N running on 3 cylinders ? Reply to specific post Reply with quote

Did you try a known good plug in that cylinder? Also try a known good plug wire.
 
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R Geiger
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PostPosted: Fri Nov 08, 2019 9:59 am    Post subject: Re: Ford 9N running on 3 cylinders ? Reply to specific post Reply with quote

One of my 8ns will foul number one plug and then run on three cylinders. When I pull the plugs the fouled one looks like the three of yours and the other three looks like your clean one. plugs should be fairly clean and not black and oily.
 
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Farmer Dan
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PostPosted: Fri Nov 08, 2019 10:31 am    Post subject: Re: Ford 9N running on 3 cylinders ? Reply to specific post Reply with quote

R Geiger wrote:
(quoted from post at 10:59:40 11/08/19) One of my 8ns will foul number one plug and then run on three cylinders. When I pull the plugs the fouled one looks like the three of yours and the other three looks like your clean one. plugs should be fairly clean and not black and oily.


wonder if both you guys could benefit by using the NGK 3212 plug?
 
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JMOR
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PostPosted: Fri Nov 08, 2019 1:03 pm    Post subject: Re: Ford 9N running on 3 cylinders ? Reply to specific post Reply with quote

CVPost-RD58 wrote:
(quoted from post at 23:07:20 11/07/19) Hi all, I am pretty new to the ford tractor and I?m having an
issue with low power on acceleration and overall bad running.
I have already rebuilt the carb and the previous owner put all
new ignition on (I bought the tractor only a few months ago). I
have since cleaned the points and the distributer even though
they are new and double checked firing order. This thing has
me stumped. It?s got 88 psi compression which is ok by the
manual I have. The very odd thing I have found is that 3 of my
spark plugs appear rich and carboned up and one appears
clean and white. (See attached picture)

Any ideas or help on this issue will be greatly appreciated

Thanks in advance

<img src="/cvphotos/cvphoto41263.jpg">
put clean plug in one of other cylinders and dark on in its place
 
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Eman85
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PostPosted: Fri Nov 08, 2019 1:41 pm    Post subject: Re: Ford 9N running on 3 cylinders ? Reply to specific post Reply with quote

Was the dead cylinder the clean one, did you kill cylinders first to see which one was dead? Did you check the coolant? Coolant isn't going to necessarily show up in the oil if it's going through the cylinder and out the exhaust.
 
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grizz02
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PostPosted: Fri Nov 08, 2019 2:12 pm    Post subject: Re: Ford 9N running on 3 cylinders ? Reply to specific post Reply with quote

IMHO like has been said coolant leak or intake leak making that cylinder lean check all 4 compression
 
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RD58
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PostPosted: Fri Nov 08, 2019 4:51 pm    Post subject: Re: Ford 9N running on 3 cylinders ? Reply to specific post Reply with quote

Ok, so I went out today and warmed up the tractor, still running poorly) then took a warm compression test, around 90psi on all cyl. Then i took all of my plugs to the wire wheel and cleaned them up and gapped to .028" I then put them in the tractor. I started it and noted it was running really rich and smoking which it was not before. I adjusted the carb leaner until the engine ran smooth and it seems to be working correctly, running on all 4. It seems to have doubled the power and everything runs smoother. I will replace the spark-plugs tomorrow as I believe they could still be an issue in the future. What do you guys think. Intermittent spark plug?
 
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Indiana Ken
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PostPosted: Fri Nov 08, 2019 5:20 pm    Post subject: Re: Ford 9N running on 3 cylinders ? Reply to specific post Reply with quote


It would appear to me it was running on one cylinder - the black ones are not firing in my book. Yes, by all means replace all four plugs and check them again after using the tractor. The insulator should be white and the ground electrode should tan near the center electrode, turning darker as it nears the threaded shell.

BTW - cleaning plugs on a wire wheel is not a good practice since the wire can leave a conductive track on the insulator. Fouled plugs should be replaced.
 
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Tomatoboy
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PostPosted: Sat Nov 09, 2019 8:02 am    Post subject: Re: Ford 9N running on 3 cylinders ? Reply to specific post Reply with quote

Interesting. So it does look like the other plugs were fouled and that clean one wasn?t steamed. I?d go ahead and replace the plugs (don?t bother trying
to salvage those, isn?t worth it) and see how it runs, if it?s got good compression and you?ve clearly got spark. I?d check the plugs regularly for a while
afterwards, just in case. Maybe it was just set too rich for those nasty plugs, who knows how old they are.
 
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Bob - MI
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PostPosted: Mon Nov 11, 2019 10:16 am    Post subject: Re: Ford 9N running on 3 cylinders ? Reply to specific post Reply with quote

Keep working on the assumption that you weren't getting good fire on the cylinders with the fouled plugs. Change plugs and run it for a while and then pull them to see what color you have on them.

You have eliminated the ignition issues by servicing the distributor so we are now working in the right direction. By the looks of those plugs those cylinders have some significant build up that needs to be cooked a bit.
 
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