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45' M

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Doug

04-24-2000 11:40:55

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My brotherinlaw has a 45' M that I can't get to run right.It smokes like unburnt gas and has a miss to it. I did a compression test #1 100psi #2 90 #3 100 #4 90. I set the valves, changed plug wires, re-gapped the plugs, re-gapped the points, checked the air cleaner, cleaned the carb, set the float. With the tractor running I took off one plug wire at a time and found that #2 makes no differance if its off or on, and the other 3 you can tell as soon as you unhook the wire it misses worse. So we took the plugs out again and spun the engine over every spark plug has spark, a real good spark,but when you put them in and tried it again the same thing happens, you can pull #2 plug wire and can't tell a differance.It has a near new dist. cap also. It's getting gas cause the plug is wet with gas when you pull it. The tractor runs good, idles good, its just #2 wont fire with the plug in the engine. This tractor has a magneto. I was thinking of trying one of my M's distributor and coil to see if that makes a differance, Any ideas? Thanks Doug

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goat64

07-04-2005 14:53:17

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Re: 45' M in reply to Doug, 04-24-2000 11:40:55

I agree, with Pappy most likely the intake manifold is leaking,but those old mag,s can also give this problem. If you have a distributor try it its a whole lot easier to fool with than those old mag,s.Let me know what you find so i may put it in my memory bank to help somebody else. Good Luck.

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Ron

04-30-2000 20:21:10

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Re: 45' M in reply to Doug, 04-24-2000 11:40:55

I had the same problem yesterday with a Farmall 400. I put in hotter spark plugs D21 and it now runs great.

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Pappy

04-25-2000 13:49:15

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Re: 45' M in reply to Doug, 04-24-2000 11:40:55

My son had an "H" with a similar problem. It would not fire on # 3 cylinder, especially when idling. We found it had a leaking intake manifold gasket under the bottom of the manifold. A small piece of gasket was missing. We found it by spraying Gumout Spray Cleaner around the manifold gasket.It started running immediately when the spray hit the hole.

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KBBob

04-25-2000 06:17:01

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Re: 45' M in reply to Doug, 04-24-2000 11:40:55

Doug, does the engine miss at idle speed only and run ok at higher speed? If so, check valve springs on the weak cylinder. You can put some pressure on the springs using a long screwdriver at idle speed. If the miss leaves, you have found the problem.

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Phil Auten (TX)

04-25-2000 05:26:16

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Re: 45' M in reply to Doug, 04-24-2000 11:40:55

Doug,
Try replacintg the mag cap. There may be a crack or some moisture damage in it. If that doesen't work, check the cam for the points to see if it has a bad lobe for #2 plug. You could then regap the points using the lobe for the #2 plug and see if that solves the problem. I agree, this is a little bit strange. Since you will be inside the mag, I'd replace the condenser as insurance. Bad ones cause some strange things to happen.

Good luck,
Phil

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HUH?!?!

04-24-2000 19:08:31

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Re: 45' M in reply to Doug, 04-24-2000 11:40:55

INJECTOR?!?!On a M,a MD maybe!

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Colby Kieffer

04-24-2000 18:48:40

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Re: 45' M in reply to Doug, 04-24-2000 11:40:55

Well It sounds like you may have an injector problem if you did all the stuff you said you did.
try that once. god luck

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TomH

04-24-2000 17:54:38

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Re: 45' M in reply to Doug, 04-24-2000 11:40:55

I had a similar problem with my H. Great spark outside the motor, but nothing on the timing light when the plug was in. New wires finally fixed it. Since you already tried that, I'd get a new distributor cap and rotor. Just because what's on it is fairly new doesn't mean it has to be good.

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04-24-2000 15:36:48

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Re: 45' M in reply to Doug, 04-24-2000 11:40:55

Had the same problem on a F-14.Turned out to be a valve problem.The plug was firing but it wasnt getting any gas to it.But you say it has gas on it.Try holding the wire just a little ways from the plug or where it plugs into the mag and see if it fires.

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picky point

04-24-2000 12:57:31

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Re: 45' M in reply to Doug, 04-24-2000 11:40:55

Doug: When you removed #2 plugwire, did you try getting a good spark to the block? Just removing a plugwire is sometimes only half the test. Making sure that wire will gap a good spark to the block tests the circuit\plugwire leading up to the plug.

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The Red

04-24-2000 11:44:55

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Re: 45' M in reply to Doug, 04-24-2000 11:40:55

Doug did you try swapping spark plugs? If you swap and the problem goes to the other cylinder than the plug is your problem. You might have to go to a hotter spark plugs. What are you using now?

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Doug

04-24-2000 14:38:31

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Re: Re: 45' M in reply to The Red, 04-24-2000 11:44:55

I did put the plug to the block and got a good spark with both his and my plug wires. And he has champion D-21 plugs in, thats what I have in all my toys. And we switched plugs around with no luck. How dose a magneto act when it get wore out? dose it spark sometimes and sometimes not and why would it be only on the one. We cranked it over several times to see if that was it but we always got a good spark. I was told about a year ago on the board not to use carbon core wires with a mag also. But these are copper wire plug wires. Thanks for info, any more ideas? still scratching my head on this one Doug.

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The Red

04-24-2000 14:50:04

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Re: Re: Re: 45' M in reply to Doug, 04-24-2000 14:38:31

Well Doug the plug is hot enough. You can get a good spark on the frame but not particulary when under compression. You have swapped plugs but still the same problem at the same cylinder. I would look at the cap real careful where the plug wire plugs in. Is the cap new? I am running out of airspeed, altitude, fuel and ideas.

I have not worked with magnetos so we'll have to get help from some of the other Farmallers.

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04-24-2000 15:00:03

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Re: Re: Re: Re: 45' M in reply to The Red, 04-24-2000 14:50:04

how new are the wires. Are you sure they are transmitting a good spark? I have times when it flashed good but did not run right, replaced wires and off it went. just a thought..also check your connections, distributor to wire, wire to plug..

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