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Tractor Talk Discussion Forum

Farmall BN

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Frank Andrews

06-28-2005 07:53:41




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I recently purchased a Farmall BN tractor that was made in the '40s. My problem now is trying to start it. I have replaced various parts of the magneto (and am getting shocked) but can't get the engine to turn over. Any suggestions other than purchasing a new mag




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Brian in NY

06-28-2005 08:53:39




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 Re: Farmall BN in reply to Frank Andrews, 06-28-2005 07:53:41  
Don't mean to be anything but helpful, but I assume that the engine is not stuck? And your starter is working? And the flywheel isn't missing some teeth? I guess I just need some more info on the tractor and what you have done to it, etc.



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Red Dave

06-28-2005 08:30:53




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 Re: Farmall BN in reply to Frank Andrews, 06-28-2005 07:53:41  
If you had the magneto apart, you may have the magneto or the rotor out of time. It's easy to do, the magneto makes one revolution for every two revolutions of the engine. It can happen if you put the magneto back on out of time. There is also a gear drive in the plate that you remove to get at the points that can easily get put back on out of time.

Here's what I do:
Take out all the sparkplugs.
Put your thumb over the #1 cylinder plug hole.
Crank the engine over slowly by hand until cylinder pressure starts to push your thumb out of the plug hole. (compression stroke)
Shine a flashlight into #1 plug hole and watch for the piston to get to the very top of the compression stroke.
Remove the distributor cap and see if the rotor is pointing at the terminal for #1 cylinder, if it isn't, you have found your problem.

Good luck!

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