firing system switch?

kennell · Oct 31, 2011

I'm having problems making my 1946 M run good. It starts great and idles decent, but when you crank it up it sputters and farts. I'm wondering if i can take the firing system off my C and try it on my M? Thanks Kent

mkirsch · Oct 31, 2011

Is the "firing system" a magneto or distributor?

In 1946 M's still came with magnetos from the factory, but some were switched over to the electric distributor at some point in their careers.

This is a magneto:

This is a distributor:

rustcollector · Oct 31, 2011

Kennell,

Assuming both are magneto systems, they are the same and will interchange. If one is a magneto and one a distributor, they will still interchange, but the distributor will require different wiring. Before removing either system, be sure you know how to time when you replace them. My advice would be do a good tuneup and see if that helps before swapping. By "sputters and farts" do you mean backfires or "burps" back through the carb?

mkirsch · Oct 31, 2011

Judging by the OP's complete lack of technical terms, I would recommend that he avoid turning wrenches for now.

He could very well end up with two non-running tractors and no way to fix either of them.

Let's just stick with some basic learning for now.

kennell · Oct 31, 2011

It had a good tune up and that didn't solve the problem. So now i need to try a different dist. and if that doesn;t help, different carb. I'll keep you informed. Kent

CNKS · Oct 31, 2011

I tend to agree with mkirsch -- and it sounds more like carburator trouble -- you really need an operators manual that explains what to do. As a start put it at WOT with the engine warm, turn the main jet adjustment screw in until it sputters, then out until smooth. Adjust the idle mixture until smooth. Repeat both until it accelerates smoothly, if not your carb needs to be overhauled, and there is a small chance that it is an ignition problem.

bc · Oct 31, 2011

Sounds to me more like a fuel delivery problem with rust or floating crud in the tank. You should be able to pull the fuel line and and run a few gallons into a can with no restrictions in flow. Remember these gravity feed tractor carbs don't have fuel pumps or fuel injectors like a car carb.

Is there any rust or crud in your sediment bowl?

Cleaning the carb will only be a short term fix if you don't fix the original problem as the carb will get plugged up again. Don't ask me how I know. If rust is a problem, there are a number of short term fixes which can be found through searches here.

kennell · Oct 31, 2011

I found my problem. The new points that we installed as part of the tune up were faulty. They looked fine but with the dist. off the M we spoted it. When the dist. lobes hit the points, that contact was lose and turned. I put new points in the dist. and it runs like a top.
Thanks for all the help and advice. I really appreciate this forum and all its helpful nenbers. Kent

mkirsch · Oct 31, 2011

Ah good.

What was with the clueless act at the beginning? All of a sudden you went from calling it a "firing system" to being able to recognize a faulty set of points in the distributor.

When asking questions more information helps. Calling it a distributor, and the fact that you did an ignition tuneup would've been useful at the beginning, and would've probably kept me from treating you like a greenhorn.

BTW, the distributor advance curves are different from a C to an M. If you swapped them out the M wouldn't run right, and neither would the C.

Earl Gray · Oct 31, 2011

What the he77 is a firing system? Never heard that one! What country are you from?

firing system switch?

kennell

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mkirsch

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rustcollector

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mkirsch

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kennell

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CNKS

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bc

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kennell

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mkirsch

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Earl Gray

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