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More Stupid M questions

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Bama Binder

01-08-2002 19:40:21




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Several Stupid M questions from a not so smart M owner. To start with, it wasn't running when I bought it. It does have good compression so I am down to getting the carb and ignition straightened out.

1. It is a 1948 with an original (4 position I think) light switch. I have been all over that rascal and can't find a cut-out relay or voltage regulator. Does that switch do that function??

2. If the light switch does do that function, does it need to be polorized like a voltage regulator?? The reason I ask is the previous owner had the battery negative ground. I changed it back and need to know if it needs to be re-polorized.

3. I really need a wiring diagram...anybody got one they can E-mail me or post here??

4. Any suggestions on which Carb kit to get?? Any special tricks to a MS (I can't spell Marvel Schnabel) Carb?? This is the first MS I have been into but have rebuilt carb off my Farmall Super H and Farmall Cub...I can't imagine anything worse to work on than a Cub carb.

5. What are your spark plug preferences and heat range preferences?? I don't know if it is oil burner or not, but I want to start with a mid range plug for an M until I get everything sorted out.

6. Does JD still have manuals? I need a repair manual and a parts manual. If not JD then who.

That should about do it for now. You should have seen me unload the thing...I had to pull it off the trailer with my JD LX178 front wheels off the ground and all...I wish I had a picture.

Thanks for now...BB

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Bus Driver

01-10-2002 17:47:57




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 Re: More Stupid M questions in reply to Bama Binder, 01-08-2002 19:40:21  
One thing you may grow to like about the carburetor is that both the idle mixture and the high speed mixture are adjustable. With mine, the high speed adjustment must be changed from hot Summer to the coldest part of Winter. About 1/8 to 1/4 turn. Setting the high speed mixture just slightly rich produces more power, reduces economy, potentially will foul plugs faster. A lean mixture will cause surging or sputtering.

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Ed Tucker

01-10-2002 01:49:04




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 Re: More Stupid M questions in reply to Bama Binder, 01-08-2002 19:40:21  
BB, I can supply you with an affordable "M" servic manual and parts book. Ed Tucker



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Drail

01-09-2002 16:15:05




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 Re: More Stupid M questions in reply to Bama Binder, 01-08-2002 19:40:21  
There is an I&T service manual on E-Bay right now.



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Clooney

01-09-2002 05:38:22




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 Re: More Stupid M questions in reply to Bama Binder, 01-08-2002 19:40:21  
~Bama Binder;
1)-No, the light s/w controls the field, it should have a cut-out relay below the & in front of the dash panel.
2)-The light s/w, regulator, & cut-out relay have nothing in them that can be polarized. The only thing on a charging system that can be polarized is the generator & if you changed battery polarity it should be re-polarized.
~To polarize the generator on an M, make sure the battery is connected the way you want & fully charged, then hook a jumper wire from the (F) "smaller of the two" posts on the generator to ground (leave it on for the next step) then momentarily touch a hot wire from the big stud on the starter to the (A) "larger of the two" posts on the generator, you should see a spark, if it sparks you're done, if it doesn't you either don't have power at the starter stud or the generator is bad.
4)- Call Roberts Crab Repair for a kit. Make sure the little inlet elbow drain (brass filter like button) in the bottom of the crab inlet neck is open & not plugged or painted over & that you put the venturi in the carb correctly.
5)-Not much available for the M, try H-12's with 2 gaskets under them @.028"
6)-I think so, mine are old Deere service manuals so I haven't bought any for the M & can't be sure what�s available

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Bama Binder - Thanks Clooney!!

01-09-2002 07:48:03




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 Re: Re: More Stupid M questions in reply to Clooney, 01-09-2002 05:38:22  
Great info!!



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jdman(MO)

01-08-2002 21:23:48




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 Re: More Stupid M questions in reply to Bama Binder, 01-08-2002 19:40:21  
I imagine your M is similar to my MT. I has the 4 position switch and the cutout is mounted under it. If I remember right there is a resistor in the switch that gives you Hi and low charge. If the polarity has been changed to negative then know telling what happened to the cutout. As far as the plugs, I run Chanmpion H10 and yes they will foul out esp. during light duty fooling around, and the present gas does not help.Better get a wiring diagram and start from scratch on the Gen wiring. The carb is pretty easy to work on. The ignition switch positions are 1,off, 2 on with low charge, 3 on with high charge, 4 on-lights,5 lights only. Manual should be available for JD. Russ

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Jim

01-09-2002 04:09:04




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 Re: Re: More Stupid M questions in reply to jdman(MO), 01-08-2002 21:23:48  
I use H-12 champions in my 48 "M" and have never had any fouling. I do use 93 octane gas. I can send you a wiring diagram. JIM



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Bama Binder

01-09-2002 04:57:58




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 Re: Re: Re: More Stupid M questions in reply to Jim, 01-09-2002 04:09:04  
Thanks for the plug recommendations and offer for the wiring diagram. I will be in your debt if you could send me the diagram...let me know how it is easiest for you to get it to me. Thanks!



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Jerry

01-09-2002 10:49:50




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 Re: Re: Re: Re: More Stupid M questions in reply to Bama Binder, 01-09-2002 04:57:58  
I got my manuals recently from Ed Tucker....great price and service from him....he is on this board, but if you can't find his email, let me know....



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