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Need help with rough running M

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dave w

03-17-2004 17:43:50

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I just purchased a M and cannot not get it to run smooth. It appears to miss in the # 2 cylinder. I have put new points, condenser and spark plugs in the tractor. # 2 spark plug does not get hot! I switch plugs between # 2 and 3 cylinders. Still number two does not fire. Switched spark plug wires, still # 2 does not fire. I have spark. I did a compression check and the PSI was 90 in # 2 . I also check # 3 and it was also 90. I don't know what the Compression should be for this engine? I think the M is about a 1941 model. The distributor cap looks to be new. Do you have any idea on what my problem is?

I would appreciate your time to comment!

Dave

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justin

03-17-2004 20:14:11

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Re: Need help with rough running M in reply to dave w, 03-17-2004 17:43:50

I just fixed the same problem you are describing today. My Dad's M was doing the same thing, so I replaced the cap & rotor (rotor was total junk), and also replaces the Champion D18Y plugs with AC C87 plugs. After doing this the tractor runs like a top. Now to get the PTO rebuilt, and rewire the Cub....

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Mr. J

03-17-2004 19:41:39

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Re: Need help with rough running M in reply to dave w, 03-17-2004 17:43:50

Dave,

My guess would be that you have a very small crack in your distributor cap, it doesn't take much of a crack for the spark to jump to ground inside the cap. Hope that helps, you can get a new Cap an NAPA or any other parts store, just make sure that you get the proper cap....Magneto ignition or distributor, I think they are different.

Good luck,

Mr. J

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Andy Martin

03-17-2004 18:59:08

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Re: Need help with rough running M in reply to dave w, 03-17-2004 17:43:50

Check the firing order. I have had an M or H start and run rough with the wires reversed. Switch the wires adjacent to #1 and see if it runs better.

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dave w

03-18-2004 10:12:46

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Re: Re: Need help with rough running M in reply to Andy Martin, 03-17-2004 18:59:08

yup, I tried this and then I have two cylinders missing. Thanks for trying to help!

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Nebraska Cowman

03-17-2004 17:54:22

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Re: Need help with rough running M in reply to dave w, 03-17-2004 17:43:50

did you try switching the wires? i would try a different cap too before i went further. check the easy things first.

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jim green

03-17-2004 20:09:21

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Re: Re: Need help with rough running M in reply to Nebraska Cowman, 03-17-2004 17:54:22

my thought was the cap also, sometimes a small crack can fool you. or,if not the wires, could the intake valve be sticking? does the plug look wet? what do you think, guys?

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dave w

03-17-2004 20:18:12

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Re: Re: Re: Need help with rough running M in reply to jim green, 03-17-2004 20:09:21

Here is what I know. I have swapped plug wires and the miss stays in cylinder # 2. A friend looked at the tractor last night and he said if it was a valve it would kinda hiss when you shut the tractor off. He could not hear it hiss and I wear hearing aids so you know my anwser to hearing something!! The spark plug is wet. It looks like I may be heading to get a new cap tomorrow from the IH dealer unless you guys have another suggestion.

you guys are great! Dave

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dave w

03-17-2004 18:44:25

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Re: Re: Need help with rough running M in reply to Nebraska Cowman, 03-17-2004 17:54:22

yup, I switch wires around. Miss still stayed in the second cylinder. I do not have another cap to switch with. I did go back out to the barn to work on the tractor. All cylinders are @ 100 psi with oil in the cylinders. I guess I will need to buy a distributor cap to try. Do you know what the compression should be?

Thanks Dave

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CNKS

03-17-2004 19:39:37

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Re: Re: Re: Need help with rough running M in reply to dave w, 03-17-2004 18:44:25

120 dry with a gasoline engine, 95 if it was distillate -- your compression is a little low for gas, but ok if cylinders are even. As to the miss, you could have a worn or slightly loose mag shaft, if none of the other things work.

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dave w

03-17-2004 19:59:55

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Re: Re: Re: Re: Need help with rough running M in reply to CNKS, 03-17-2004 19:39:37

The cylinders have even compression. How can I determine what type of engine I have? Gas or distallite? The hood cover has the hole for the additional distallate tank, but no tank. My tractor has a distributor ignition. what is meant by a loose mag shaft? Sorry for all the questions and I do appreiate everybody's help trying to help me out!!
Dave

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CNKS

03-18-2004 07:52:44

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Re: Re: Re: Re: Re: Need help with rough running M in reply to dave w, 03-17-2004 19:59:55

The mag or dist shaft is just a guess. They can become worn or loose and cause a misfire on one cylinder, a crude test is to see if it has play in it. The distributer was an option on a 41, most came with mags. From your compression readings I would say you have a gas engine, or a kerosene/distillate in good condition. To be sure, post the number you find on the head. You may have to remove the valve cover to see it. There are 12 different different head combinations listed in my parts book, some of which are assembly numbers which won't be on the head. The numbers will probably be 4 digit beginning with a 6 or 8 followed by letters.

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Dave

03-17-2004 22:04:35

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Re: Re: Re: Re: Re: Need help with rough running M in reply to dave w, 03-17-2004 19:59:55

Dave , take the no 2 plug out , leave the wire hooked to it & clamp it with a vise grip to a good ground (bolt on top of oil filter works good)...start the M & see if the plug is fireing - no fire means the problem is electrical , one of the things already mentioned (cap ,rotor - etc)i doubt wires got switched -then you'd be missing on 2 cyl'drs..... if the plug sparks , then it's a bad valve (although then i'd think compression would be less on that cyl.?)- one other remote possability is a bad manifold gasket or maybe carb gasket (not getting gas to no 2) ..... .good luck ! Dave

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