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John Deere Tractors Discussion Forum
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Model M not starting

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baldy6695665

11-04-2005 08:54:44




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The problem originallly---No. 1 fired sometimes other times OK
Have replaced ---coil, distributor cap,rotor,points,condenser installed carb kit.
Checked timing manually, checked clearances on valves and points.
Now it will not start. Carb shows gas out the inlet when full choke. Puff of smoke out stack but no start.
What else to do??




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Daniel Mullis

11-04-2005 17:58:57




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 Re: Model M not starting in reply to baldy6695665, 11-04-2005 08:54:44  
Make sure points are set right! Its just like my JD40,if you can't see a small spark when the points open with cap and rotor off It ain't going to fire! They can be rather hateful! You can get an electronic ignition for this M that will put an end to this!



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baldy6695665

11-04-2005 19:55:34




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 Re: Model M not starting in reply to Daniel Mullis, 11-04-2005 17:58:57  
thanks for the info. I may have to pur in the electronic ignition because I can see a spark.



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shoe

11-04-2005 17:27:04




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 Re: Model M not starting in reply to baldy6695665, 11-04-2005 08:54:44  
You did'nt mention if you put in new plugs or
not. Have a M myself, took it to a pull a couple
years ago, it just quit me after 50 feet. Took
it home and one plug only fired about half the time.
Think this might be the problem. Hope it is, it's
a cheap fix. Good luck.



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Maark

11-04-2005 13:41:28




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 Re: Model M not starting in reply to baldy6695665, 11-04-2005 08:54:44  
My experience with the Dubuque engines have been to not choke them very much or they will flood and foul the plugs very easy. New plugs should get you running.



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John T

11-04-2005 12:37:58




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 Re: Model M not starting in reply to baldy6695665, 11-04-2005 08:54:44  
Remove the plugs but have their wires attached n their sides grounded n turn her on n crank her over and insure a good blue spark is jumping the plug gap. If the plugs are wet fouled or carboned up try a fresh set. If firing, then you gotta make sure the firing occurs when the correct piston is at TDC. If its the correct cap????? and the distibutor is in time???? check the timing by seeing if when the points break open on the leading cam lobe the rotor tip is lined up with where the cap terminal (if on) would be that leads to the No 1 cylinder, and then 180 of crank (90 of distributor) rotation later, the rotor tip should be lined up with the cap tower location to the No 2 cylinder as the points start to break open on the lagging cam lobe.

If the plugs arent firing, see if at least the coil wire bare end when removed from the cap (coil end stays in coil) and placed 1/8 " from the head or block and shes turned on n cranked over. Each time the points have been closed but then break open, the coil wire ought to fire.

If the coils not firing post back for more troubleshooting !!!!! !!!!! !!

John T

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baldy

11-12-2005 09:39:50




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 Re: Model M not starting in reply to John T, 11-04-2005 12:37:58  
Thanks John T Your info was a lot of help. I had been setting the flywheel at the "spark" marking and was not having any luck. I disregarded the mark and just checked to see that both valves were@ TDC then set the distributor and the points to just before the break. I cranked and it ran for 3 or 4 minutes before I shut it down. Need to have the radiator repaired before I put it back to work. Will have to wait to then to see if the original problem is solved. The No. 1 cylinder was not firing all the time.

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Mike M

11-04-2005 09:42:24




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 Re: Model M not starting in reply to baldy6695665, 11-04-2005 08:54:44  
Try some brand new spark plugs as your may be gas fouled and won't fire right. If your old plugs are damp check for antifreeze as those M's are prone to crack heads.



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