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49 Ford 8N
:

running on 2 cylinders

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Jim

09-09-2002 17:46:50




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Tractor was running fine one day, next time it was started was running on # 2 & 3 cylinder only. Checked #1 and 4 and appear to have good spark but no gas. Any suggestion? govener? bad fuel pump?




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Evil Steve

09-10-2002 07:42:29




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 Re: 49 Ford 8N - running on 2 cylinders in reply to Jim, 09-09-2002 17:46:50  
I agree with bg. You either have an ignition problem or a valve problem (though it's very difficult to believe that TWO cylinder's valves went bad at the same time).

I'm betting that either 1) your points need filing/replacing and regapping, 2) that your rotor is not distributing spark squarely to the #1 and 4 terminals in your dist cap (can be caused by worn dist - check it by trying to rock the dist shaft back and forth and up and down AND by simply looking at the inside terminal posts to see if carbon is burning squarely on the terminal as opposed to off to the side of terminal), 3) rotor/cap in poor shape 4) your #1 and 4 plugs and/or plug wires are bad), OR 5) any combo of above.

Just because you have spark to #1 and 4 doesn't mean it's GOOD spark. It should be whiteish/blue.

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Evil Steve

09-10-2002 07:42:20




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 Re: 49 Ford 8N - running on 2 cylinders in reply to Jim, 09-09-2002 17:46:50  
I agree with bg. You either have an ignition problem or a valve problem (though it's very difficult to believe that TWO cylinder's valves went bad at the same time).

I'm betting that either 1) your points need filing/replacing and regapping, 2) that your rotor is not distributing spark squarely to the #1 and 4 terminals in your dist cap (can be caused by worn dist - check it by trying to rock the dist shaft back and forth and up and down AND by simply looking at the inside terminal posts to see if carbon is burning squarely on the terminal as opposed to off to the side of terminal), 3) rotor/cap in poor shape 4) your #1 and 4 plugs and/or plug wires are bad), OR 5) any combo of above.

Just because you have spark to #1 and 4 doesn't mean it's GOOD spark. It should be whiteish/blue.

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Oops, sorry for double post - Evil Steve

09-10-2002 07:43:04




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 Re: Re: 49 Ford 8N - running on 2 cylinders in reply to Evil Steve, 09-10-2002 07:42:20  



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Levi (WA)

09-09-2002 19:28:51




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 Re: 49 Ford 8N - running on 2 cylinders in reply to Jim, 09-09-2002 17:46:50  
Jim, Did you know that N's only have 2 intake runners?? the front one feeds 1&2 cyl and the back one feeds 3&4 soo if you have gas to 2&3 then...well you know...I'd go back to the spark thing again if it was me....$.02



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bg

09-09-2002 18:06:48




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 Re: 49 Ford 8N - running on 2 cylinders in reply to Jim, 09-09-2002 17:46:50  
There ain't a fuel pump on an N unless it's been added. Even if it had a fuel pump, all the cylinders share the same intake manifold. It doesn't make sense that 2 cylinders would get gas and 2 won't, unless two intakes are plugged up or the manifold is cracked or has a hole burned through it and is sucking air on 1 and 4. The governor regulates engine speed by controlling the throttle. If you're sure you have spark on 1 & 4, and no fuel(how do you know?) it sounds like stuck valves. Have you done a compression check or vacuum check? Are the wires on in correct order? Did you check the rotor for good contact?

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Bill

09-10-2002 21:47:38




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 Re: Re: 49 Ford 8N - running on 2 cylinders in reply to bg, 09-09-2002 18:06:48  
Checking the firing order might be wothwhile.

Used to be with the old 4 cylinder military Jeeps swapping two spark plug wires would fire those two plugs on the exhaust stroke - presto two dead cylinders.



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