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Bspauld
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Joined: 05 Mar 2009
Posts: 1381
Location: Michigan

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PostPosted: Wed Sep 11, 2019 7:39 am    Post subject: Help Reply to specific post Reply with quote

I have a Farmall "M" that had the head redone before I got it, it had/has a miss that I can not find the cause. I have the valve cover off, everything is working there, compression is about 100 lbs on all 4 cylinders, all electronics are new, including a distributor cap . Number 3 misses, it comes out wet and cold. I change the plugs and still number 3 , even tryed a new plug, It has compression, spark, I see a spark when its out of the tractor, and gas, I can not figure out what can be wrong. And help would be heaven sent. Thanks for reading
 
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steve_in_mo
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Joined: 15 Sep 2014
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PostPosted: Wed Sep 11, 2019 8:05 am    Post subject: Re: Help Reply to specific post Reply with quote

Spark out of the tractor should be sharp, crisp, and blue.
What about plug wires? What about the rotor?
Can you swap in a distributor from another tractor that runs well?
 
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DR. EVIL
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Joined: 26 Aug 2014
Posts: 1840


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PostPosted: Wed Sep 11, 2019 8:53 am    Post subject: Re: Help Reply to specific post Reply with quote

Have a guy on the RPM forum that rebuilt a 806 LP, best of everything, got done and it ran on 5 cylinders. Rechecked everything, tested plug wires for continuity, still missed on one hole. Played with points, valve clearance, carb, still missing on one hole. A new distributor cap finally fixed it!
 
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Bspauld
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Joined: 05 Mar 2009
Posts: 1381
Location: Michigan

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PostPosted: Wed Sep 11, 2019 8:57 am    Post subject: Re: Help Reply to specific post Reply with quote

I changed the plug wires, New cap, I have been at this , off and on, for a year. Driving me nuts
 
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Bspauld
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Joined: 05 Mar 2009
Posts: 1381
Location: Michigan

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PostPosted: Wed Sep 11, 2019 8:59 am    Post subject: Re: Help Reply to specific post Reply with quote

The spark is sharp and blue, the same as the other 3.
 
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Janicholson
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Joined: 30 Jan 2004
Posts: 32330
Location: St. Cloud, MN

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PostPosted: Wed Sep 11, 2019 9:21 am    Post subject: Re: Help Reply to specific post Reply with quote

Intake manifold leak. Some are internal between the exhaust heat box and the intake. Jim
 
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55 50 Ron
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Joined: 17 Mar 2008
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PostPosted: Wed Sep 11, 2019 9:45 am    Post subject: Re: Help Reply to specific post Reply with quote

Has it always missed since you have owned it? Since compression is good on all 4 cyl, can that still mean the problem of manifold that JAN mentioned?
 
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CenTex Farmall
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Joined: 04 Dec 2006
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PostPosted: Wed Sep 11, 2019 9:50 am    Post subject: Re: Help Reply to specific post Reply with quote

Did it get new valve springs when the head was rebuilt?
 
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Bspauld
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Joined: 05 Mar 2009
Posts: 1381
Location: Michigan

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PostPosted: Wed Sep 11, 2019 11:19 am    Post subject: Re: Help Reply to specific post Reply with quote

I will check the intake manifold to see if its leaking, I didnt think of that, Thanks to Janicholson and 55 50 Ron and all other replys
 
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caterpillar guy
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Joined: 24 Jun 2007
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PostPosted: Wed Sep 11, 2019 11:34 am    Post subject: Re: Help Reply to specific post Reply with quote

Try a baling wire around the plug porcelain. Then put a small loop for the wire to set on. See if that fixes it, if so then your plug is the problem. The gap by the tip of the plug, makes it need more spark to jump thus making the plug fire.
 
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RTR
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Joined: 29 Sep 2010
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PostPosted: Wed Sep 11, 2019 11:44 am    Post subject: Re: Help Reply to specific post Reply with quote

check to see if the distributor shaft isn't bent. We just got a Farmall 130 running this weekend and was not firing on 2 cyls. Tried everything and scratched our head a bit. Figured out the center shaft was bent causing the cam lobes to not open the breaker points on those 2 cylinders. Swapped distributors and it runs perfectly now.
 
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used red MN
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Joined: 24 Aug 2013
Posts: 1332
Location: Coon Rapids, MN

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PostPosted: Wed Sep 11, 2019 12:17 pm    Post subject: Re: Help Reply to specific post Reply with quote

I think Jim and Ron are sending you down the right path. How do you use this tractor? Is it just a collector/ show tractor or does it actually do some work? If not worked much, just dinking around with it adds to the plug fouling when it is idling a lot with that lean mixture going to that cylinder. You can check the sealing of the manifold by aiming an unlit propane torch or spraying either at the manifold where it mates the head. A change in how it runs will tell you if you found a leak. However, this will not tell you if the manifold is burned through between the intake and exhaust. That can only be verified by disassembly. Also I don?t know how you determined it is number 3 cylinder but you should be able to confirm that cylinder 3 is firing by running the engine at a higher speed say half throttle or more. Then pull number three plug wire out of the dist. cap, if the engine sound changes you know that cylinder is firing. The difference is at idle there is a lot lower flow of air..fuel mix and the additional air or exhaust leaking in leans the mixture more then at higher rpms. I?ve said enough, hope this helps.
 
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Bspauld
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Joined: 05 Mar 2009
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Location: Michigan

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PostPosted: Wed Sep 11, 2019 1:22 pm    Post subject: Re: Help Reply to specific post Reply with quote

I bought this tractor from a friend, he used it to bale with, but said it had a miss at an idle, it missed at all speeds, but did smooth out at higher RPMS. I wont use it to farm, just go to a tractor show or 2 and a parade. I will check the manifold Friday and let you know what I find, I really appreciate all the help
 
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khouse6
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Joined: 12 Apr 2014
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PostPosted: Wed Sep 11, 2019 1:37 pm    Post subject: Re: Help Reply to specific post Reply with quote

i was reading your post. i do not understand exactly what you are telling the feller to do with the wire. wire around the plug, then circle, then _____. hmmm
 
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rustred
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Joined: 01 Jul 2009
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PostPosted: Wed Sep 11, 2019 4:12 pm    Post subject: Re: Help Reply to specific post Reply with quote

pull the coil wire out about 1/2 inch so you can see the spark with engine running, and see what that does. and when your speaking electronic's ? is that the points and condenser or actual electronic ignition???
 
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