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1947 M Carb help

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Alabama

08-24-2001 06:16:06

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I took an old M out of a hay field it has a wide front (not MV) maybe aftermarket but looks factory ordered. I Made sure all the fluids were replaced and gas tank flushed and cleaned (could have sat for years). I had to rewire it (it had been converted to 12V). It started on the second try (first try I forgot choke). The owner was too as I only gave $500.00 for a great tractor.

Q. Its Burning Black smoke (running rich), how do I adjust the carb and reduce fuel/increase airflow?

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Mark A

08-24-2001 11:36:50

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Re: 1947 M Carb help in reply to Alabama, 08-24-2001 06:16:06

Make sure the choke linkage is moving fully like it should. Also check to see that the air intake is clear and has no mud dauber restrictions and that the oil bath air cleaner has fresh clean oil of the proper weight. Then you may still have to adjust as the other guys have explained to you. Good luck, and I will offer $5 more over any other guys offer to buy it from you!

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shannon

08-24-2001 10:19:27

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Re: 1947 M Carb help in reply to Alabama, 08-24-2001 06:16:06

hello, i am 99% shure about the following, i would have t refer to my i&t manual to verify it. i have a 450 and the carburator is for the most part identical to the m's, it may very in venturi and fuel jet, but the adjustments are the same. if it has been sitting for a while you may want to check your needle and seat to make sure it is still good. if this is bad then the fuel will not stop flowing into the carburator when your float floats. the previous would be more than likely true if it burns black smoke constant, that is at idle and at wot (wide open throttle). if it only smokes at idle then your idle mixture is too rich. or if it only smokes at wot then your main adjust screw is set to rich. the book explains about how to set it (idle mixture) according to how it sounds ( turn it left until it sounds rough, turn it right untill it sounds rough, then set it between those two points where it sounds the best) but the best way is to find someone who has a pto dynometer and set it that way. as for the adjustment locations: the main adjustment screw, which should be set at wot under a load, is the screw directly below the shaft that runs from the governer to the carburator this should be factory calibrated with a set number of turns (i think it is 5 for a 450 but that is probably different from the m due to the afforementioned differences but if you cant find the factory setting cou can guestimate how rich it is by the color of the exhaust (black rich clear good) and the sound the engine makes lean makes it "pop" this is bad, but for better acuracy you should do it on a dynometer since you should set it under a load anyway) from when it is seated (fuel shut off; clockwise) if it is only running rich at wot then this is your culprit. counter clockwise(screw gets screwed out from the carburator) richens clockwise(screw gets screwed into the carburator) leans.
the idle speed adjustment is located in line with the shaft that connects the governer and carburator this just sets your idle rpm. the idle adjustment screw is located near the idle speed screw i am pretty sure it is clockwise for leaning it out and counter clockwise for a more rich mixxture. this adjustment had absolutely no effect on the wot mixture, but the main adjust screw can affect the idle mixture. this would be what you have to adjust if it is smoking at idle.

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The Red

08-24-2001 07:58:52

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Re: 1947 M Carb help in reply to Alabama, 08-24-2001 06:16:06

Your running way too rich. To add to Bama Binder's remarks, the high speed mixture screw is the lower horizontal screw near the bottom of the carburetor bowl. Turn clockwise until you start to drop RPMs then open back up 1/2 turn or so.

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Alabama

08-24-2001 08:05:18

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Re: Re: 1947 M Carb help in reply to The Red, 08-24-2001 07:58:52

Thanks for the comments, in your reply (The Red) I assume I should get the mixture correct at idle then adjust the high speed mixture screw (at high RPM)?

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The Red

08-24-2001 08:07:51

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Re: Re: Re: 1947 M Carb help in reply to Alabama, 08-24-2001 08:05:18

Once you are over 1,000 RPM give or take, the high speed mixture screw will affect the performance. Yes I set the high speed at or near full RPM and the low speed mixture at idle RPM.

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Bama Binder

08-24-2001 06:48:42

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Re: 1947 M Carb help in reply to Alabama, 08-24-2001 06:16:06

I don't know...black smoke is bad news..why don't you let me take it off your hands for say $600 or so...I wouldn't want you to have to worry about the carb problems.

Just kidding...some people have all the luck.

I think the procedure is to get it up to operating temp. Then screw in the needle that adjusts the main jet until RPMs pick up and then begin to fall off. Back it out to where the RPMs pick up again and than add 1/2 turn to make sure you are not running too lean. That should take care of the plack smoke.

If not, the needle valve may need to be replaced. If it were mine, I'd go ahead and spring for the Carb kit and rebuild it...you are so far ahead already I think you could afford the extra $$$s.

Good find!! BB

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Jeff

08-24-2001 14:21:57

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Re: Re: 1947 M Carb help in reply to Bama Binder, 08-24-2001 06:48:42

Far ahead? I would say he stole it at twice the price. Tractors are getting high around here!

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