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Farmall & IHC Tractors Discussion Forum
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Need help bad. going insane

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bigfutty

03-14-2008 16:35:37




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I have an engine out of a 140 that i am puting into a farmall c. i replaced all of the gaskets and rebuilt the carb and went to start the tractor. the engine ran but a little rough. i tried to adjust the carb and get it to run smooth. i never had any luck so i asked a friend for some help. he couldnt get it either. so as a test we pulled some of the spark plug wires to see if maybe it was one of the cylinder. well it was not just one but two. when number 1 and 2 cylinder wires are removed the tractor continues to run like it has. i tested crompression all of the cylinders are between 123-127. i repleaced all of the ignition parts. i took the manifold off and it is clean. but when i check the intake # 3 and 4 have more suction then the others. all of thevalves are adjusted and the engine was running as of 5 months ago but was in a fire so i got it. any help would be greatly appericated. sorry for thelong and hard to read post but i am at the end of my rope i am not sure it i should just let is run on 2 cylinders and paint it green or what.

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Handyman

03-15-2008 19:35:44




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 Re: Need help bad. going insane in reply to bigfutty, 03-14-2008 16:35:37  
if you replaced the plug wires did you use silicon core wires or copper or steel core wires? these old tractors dont like running on silicon core wires you need to use the older style metalic core wires



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Bruce Wa.

03-15-2008 18:43:55




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 Re: Need help bad. going insane in reply to bigfutty, 03-14-2008 16:35:37  
I agree, the plug wires are out of order.



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Goose

03-15-2008 09:14:47




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 Re: Need help bad. going insane in reply to bigfutty, 03-14-2008 16:35:37  
It helps to walk away from it for a while and think about it, instead of getting "over-torqued".

And this is a good place to come for advice. I worked on electronic systems on jet fighter planes in the Marine Corps. Some of the problems that come up are unbelievable. Someone once said that of all of the REALLY tough problems, probably more were fixed over a beer in the Staff NCO Club than out on the flight line.

He was probably right.

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Brownie450

03-15-2008 06:22:40




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 Re: Need help bad. going insane in reply to bigfutty, 03-14-2008 16:35:37  
Jim is right in that #1&2 may be reversed in the distributor cap. Have you tried switching # 1&2? Valve clearance should be checked also. With compression being even like it is, check all other possibilities for trouble before digging into engine. Crack in distributor cap between # 1&2 ??? Could there have been crud gotten into the lifter sockets that would have affected the valve clearances after the engine turned over a few times. never assume anything--check to be sure.

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El Toro

03-15-2008 06:12:55




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 Re: Need help bad. going insane in reply to bigfutty, 03-14-2008 16:35:37  
Hold your hand over the throat of the carburetor and see if there's good suction there. Hal



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NawlensGator

03-15-2008 02:15:07




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 Re: Need help bad. going insane in reply to bigfutty, 03-14-2008 16:35:37  

Had a similar problem on a cub engine. Found out the plug wires to 2 cylinders were not making contact in the distributor ends. Replaced the wires and it ran great. I used a timing light with rpm readout and clipped it on each plug wire. Plugs not firing read zero rpm.



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Haas

03-14-2008 18:31:01




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 Re: Need help bad. going insane in reply to bigfutty, 03-14-2008 16:35:37  
If you have good compression and spark and the timing is good, the tractor should run. From your description, you don't say anything about checking the valve clearance. So if you have not done than, pull the valve rocker arm cover off and adjust the valves per the manual. If you don't have good intake suction on 1 and 2 cylinders, it sounds like exhaust valves are open when they should not be, or since you have good compression, the intake valve is not opening at all. You may find that push rods are bent of have jumped out of the seat in the rocker arm.

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Haas

03-14-2008 18:35:27




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 Re: Need help bad. going insane in reply to Haas, 03-14-2008 18:31:01  
Reread your post and you did say you adjusted the valves. Still sounds like a valve or timing problem to me though. Does the tractor have a magneto or is is battery ignition??



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JT

03-14-2008 18:13:08




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 Re: Need help bad. going insane in reply to bigfutty, 03-14-2008 16:35:37  
It depends on the type and intesity of the fire. The block could be cracked, head/block warped, intake warped and leaking, head cracked. If it was a hot fire and if got water on a hot cast iron block, you may have a boat anchor. That is why I will not mess with a piece that has been in a fire, too much potential structural damage.
Jim



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Vito

03-14-2008 17:29:40




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 Re: Need help bad. going insane in reply to bigfutty, 03-14-2008 16:35:37  
Your last sentence is funny.Look this tractor thing is a hobby for me.When I get all bent up in the head I walk away for awhile and think it through.I no not the post you were looking for.
Vito



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Janicholson

03-14-2008 16:56:04




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 Re: Need help bad. going insane in reply to bigfutty, 03-14-2008 16:35:37  
Firing order is 1342
the distributor (from the back) turns clockwise and has the wires positioned:
2-1
4-3

If these are correct, there may be an intake leak to those cylinders. Use a propane torch with the tip removed to put raw propane around the manifold (if the cylinders pick up, there is a leak. If this does not work, the next plan would be to put a tablespoon or so of fuel in each of those spark plug holes to see if giving it some direct fuel makes it take off. Keel up informed so we know what you find. JimN

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