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Ford 9N, 2N & 8N Discussion Forum
Show Parts for Model:

A burping 8N

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anvilheadtexas

02-17-2014 07:27:53
99.117.216.44



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I sought help a few weeks ago regarding my sick sounding '49 8n. Yesterday the weather was nice enough to work outside and trouble shoot. I covered off on all the easy potentials...drain gas, checked plugs, checked plug wires, etc. I paused and just listened to the sickness and soon realized this tractor was "burping" air out of the air intake as well as muffler. Upon further investigation, I noted that the air breather tube (from carb to cleaner)seemed hotter than what a breather tube should be. I pulled a rookie mistake and took off oil bath cup and when she burped oil spit out from cleaner and caught on fire for a second when oil hot muffler!

What would cause exhaust (I assume) to be be forced back up through the breather tube. A few other points to maybe help a kind member diagnose..

1. No exhaust smoke comes through the air filter. When it burped with cup off oil did come out but no exhaust.
2. Not too long ago I reattched the muffler to the manifold...could I have created a blockage?
3.I checked the spark plug wires and as far as can tell they are all connected right?
4. Gas is good.
5. Oil batch cup was filthy...did not realize if could get this cruddy.
6. There was no change in how it ran with oil cup on or off (I did not think there would be) but I almost lit tractor on fire doing it!

Guys, I would appreciate any guidance. I am not a complete rookie...having restored another 8n from top to bottom, but this particular 8n has me totally confused....

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pconnie

02-18-2014 06:23:15
70.195.2.173



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 Re: A burping 8N in reply to anvilheadtexas, 02-17-2014 07:27:53  
Lots of info..let us know what you find wrong..phil



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Royse

02-17-2014 16:19:15
69.36.49.186



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 Re: A burping 8N in reply to anvilheadtexas, 02-17-2014 07:27:53  
If you have a multimeter you can measure continuity from one

end of the plug wire to the other end to make sure it goes where

you think it goes.

If not, you can use a battery on one end and a light bulb on the
other end to make sure you've got the same wire on each end.



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anvilheadtexas

02-17-2014 16:49:04
99.117.216.44



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 Re: A burping 8N in reply to Royse, 02-17-2014 16:19:15  
Good point..I was thinking a set of spare wires that bypass the tube...hook them up and see if problem goes away...



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TL (Va)

02-17-2014 14:46:54
64.84.106.222



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 Re: A burping 8N in reply to anvilheadtexas, 02-17-2014 07:27:53  
Quoting Removed, click Modern View to see

You don't sound sure about the plug wires, I would double check to make sure they are wired correctly.



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anvilheadtexas

02-17-2014 14:56:34
99.117.216.44



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 Re: A burping 8N in reply to TL (Va), 02-17-2014 14:46:54  
You are very correct... my wires are crammed in the tube over the block... when originally wired it I numbered the boots that plug itno the dist (fron mount) and now the numbers are gone... how I "Know" the wiring is correct...longer ones on the bottom... Always a possibility of a boo-boo here. That tube does not allow me to do a visual from dist to plug.



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tracman

02-17-2014 12:21:47
142.52.81.11



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 Re: A burping 8N in reply to anvilheadtexas, 02-17-2014 07:27:53  
Quoting Removed, click Modern View to see



Could you be running lean such as bad carb adjustment or a bad vacuum leak?



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old

02-17-2014 11:33:49
209.86.226.59



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 Re: A burping 8N in reply to anvilheadtexas, 02-17-2014 07:27:53  
Give this a try. Take a quart of ATF and pour it into a gallon of gas and run it with that. If you already have a good bit of gas in it then use that and add as much ATF to it to bring it close to that mix and run it. If it has sticking valves or carbon that should clear up the problem



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ASEguy

02-18-2014 03:39:37
24.207.160.166



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 Re: A burping 8N in reply to old, 02-17-2014 11:33:49  
Went to a seminar on biodiesel several years ago. The conversation worked its way to putting tranny fluid in a Powerstroke. The instructor said when they pulled the head on that engine the combustion chamber looked like it had been power washed on all cylinders. Apparently they were testing the effects of different types of "fuels" for diesels. This tranny fluid was used, but filtered, from waste.

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old

02-18-2014 07:53:11
209.86.226.34



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 Re: A burping 8N in reply to ASEguy, 02-18-2014 03:39:37  
Yep ATF will clean up things and free up sticking parts real well guess that is why I keep saying to people they should use the stuff. Shoot I have an old pumper oil can I use that has ATF in it



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JCinKY

02-18-2014 08:03:07
64.57.165.186



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 Re: A burping 8N in reply to old, 02-18-2014 07:53:11  
Quoting Removed, click Modern View to see

I love the stuff, and Old you turned me on to it. I haven't bought any PB Blaster in a year or so.

I buy cheap Type F ATF at Wally World and mix if about 60/40 with lacquer thinner. It is my go to penetrating fluid, valve unsticker, multi-use product.

Put it in a spray bottle, shake and go...



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old

02-18-2014 08:14:25
209.86.226.34



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 Re: A burping 8N in reply to JCinKY, 02-18-2014 08:03:07  
Ya funny how when I first joined Y-T and said things about ATF and had people tell me I was dump and stupid and it did not work but 10 plus years later well people have found out it does work well



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anvilheadtexas

02-17-2014 13:24:20
99.117.216.44



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 Re: A burping 8N in reply to old, 02-17-2014 11:33:49  
Old... thank you. Not sure what ATF is? Some gas treatment yes?



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old

02-17-2014 13:41:45
209.86.226.56



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 Re: A burping 8N in reply to anvilheadtexas, 02-17-2014 13:24:20  
Guess you do not read many of my posts. ATF is something I have talked about for over a decade on here. Yep transmission fluid is ATF Dextron 3 is what I use



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anvilheadtexas

02-17-2014 14:15:28
99.117.216.44



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 Re: A burping 8N in reply to old, 02-17-2014 13:41:45  
Old... have not prowled in a long time... but I do recall your suggestions always had some good sense behind them... I will try it.



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old

02-17-2014 15:29:24
209.86.226.57



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 Re: A burping 8N in reply to anvilheadtexas, 02-17-2014 14:15:28  
Next time your in a store that has Marvel Mystery oil pick up a can of it and read what it is used for. Then use ATF in its place. ATF does the same thing as MMO but at half the cost



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anvilheadtexas

02-17-2014 16:47:02
99.117.216.44



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 Re: A burping 8N in reply to old, 02-17-2014 15:29:24  
Yes, but does it smell as good!!! Haha! Thank you. I am restoring a Farmall Cub in my garage here in Houston. My sick 8N is up at my land an hour and a half from here...which makes trying all these very good tips tough...cause I have to wait to go up there on weekend. I want to bring the 8N home to give it the full once over... but last time I had my 16 foot trailer in Houston...someone stole it!

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old

02-17-2014 18:53:39
209.86.226.56



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 Re: A burping 8N in reply to anvilheadtexas, 02-17-2014 16:47:02  

Ya I could not handle having to keep a tractor away from my place of living. As for a cub BTDT and did one for a friend a few years back. As for the MMO and ATF ya the ATF does not smell as good but for half the cost I can sure as heck live with out the good smell. LOL



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Tom Jubilee

02-17-2014 17:24:47
166.137.116.19



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 Re: A burping 8N in reply to anvilheadtexas, 02-17-2014 16:47:02  
Thieves in Houston? Don't send them my way!!



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JCinKY

02-17-2014 13:36:43
64.57.165.186



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 Re: A burping 8N in reply to anvilheadtexas, 02-17-2014 13:24:20  
Quoting Removed, click Modern View to see

Automatic Transmission Fluid; does the same job as Marvel Mystery Oil (MMO) without the price.

It is a solvent and will keep everything clean and deposit free. Add about a cup to every 10 gal of gas. I add some everytime I fill up.



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anvilheadtexas

02-17-2014 14:17:18
99.117.216.44



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 Re: A burping 8N in reply to JCinKY, 02-17-2014 13:36:43  
I did add a little Marvel when I refilled the gas tank (4 gallons only) with fresh fuel....

What is the accepted ratio of marvel or transmission fluid to gas for an 8N?



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pconnie..ks.

02-17-2014 11:09:21
70.195.2.173



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 Re: A burping 8N in reply to anvilheadtexas, 02-17-2014 07:27:53  
is it popping out the intake and exhaust..drape a shop towel over end of tail pipe..if it sucks it in the pipe ..exhaust valve is leaking..if only popping out intake just intake valve is leaking..i would rev it to 6-700 rpm listen for any change in popping tempo..if comp. # are the same from a yr. ago it seems its a sticking valve..treating gas and oil might take care of it..if not you may have to remove side cover and treat the lifters

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mhb@ufe

02-17-2014 11:01:44
24.39.22.34



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 Re: A burping 8N in reply to anvilheadtexas, 02-17-2014 07:27:53  
To get that much pressure back through the intake there would need to be an intake valve open when a piston is coming up on compression. Your previous compression numbers don't indicate that but I would recommend doing another test.

Mark



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pconnie..ks.

02-17-2014 09:29:21
70.195.2.173



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 Re: A burping 8N in reply to anvilheadtexas, 02-17-2014 07:27:53  
is the burping constant or intermitant.



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anvilheadtexas

02-17-2014 09:37:20
99.117.216.44



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 Re: A burping 8N in reply to pconnie..ks., 02-17-2014 09:29:21  
Not sure how to answer it....it does not come and go...so it is consistent from that standpoint but the burbs are not every second as it runs...does this indicate ONE valve/cylinder has a problem?



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ericlb

02-17-2014 08:09:34
67.142.161.21



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 Re: A burping 8N in reply to anvilheadtexas, 02-17-2014 07:27:53  
i agree a compression test is needed if you havent done that im thinking a stuck or badly burned intake valve would make this happen



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mhb@ufe

02-17-2014 08:02:23
24.39.22.34



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 Re: A burping 8N in reply to anvilheadtexas, 02-17-2014 07:27:53  
Have you done a compression test?

Mark



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anvilheadtexas

02-17-2014 08:27:31
99.117.216.44



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 Re: A burping 8N in reply to mhb@ufe, 02-17-2014 08:02:23  
Not real recently...last time I did I remember one reading to by higher than than others... test was done on 2/10/13 and tractor was doing the same thing then... results were:
1 - 90
2 - 90
3 - 90
4 - 105



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JCinKY

02-17-2014 07:47:32
64.57.165.186



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 Re: A burping 8N in reply to anvilheadtexas, 02-17-2014 07:27:53  
Sticking valve could cause it to backfire through the carb. If intake hangs open on exhaust stroke some of the gases will back into the carb.

Any critters build a nest in the exhaust somewhere???



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anvilheadtexas

02-17-2014 08:23:00
99.117.216.44



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 Re: A burping 8N in reply to JCinKY, 02-17-2014 07:47:32  
Someone with very good knowledge of these tractors once told me the sticking valves are very uncommon when I first starting exploring my challenges with this tractor. Regarding critters.. I considered this as well... what are the procedures to check for nests etc...? The muffler was a little loose from manifold on this tractor for a while...I wonder if a dirt dauber built a nest?



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