Question about Craftsman 42 in. Deck 19.5hp Lawn Tractor

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HAVE A JOHN DEERE 318 LAWN TRACTOR, CHANGED POINTS AND CONDENSER, WON'T TURN OVER, TRIED STARTING FLUID IN CARB AND NOTHING. CAN IT BE THE COIL AND HOW DO I CHECK? THANKS

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Check the coil impedance on the primary and secondary side. You'll have to disconnect the battery negative cable so you don't short something out. Unplug the spark plug wires and the two sets of smaller wires connected to the primary side of the coil. The primary coil reading should be between 3.7 ohms and 4.6 ohms while the secondary (spark plug side) should be between 34.2 k-ohms and 41.6 k-ohms. If the resistance values you measure are outside of these ranges, you need to replace the coil.

Posted on May 19, 2009

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I'm wanting to change points & condenser


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May 12, 2010 | Craftsman 42 in. Deck 19.5hp Lawn Tractor

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BEEN RUNNING ROUGH WITH LESS POWER THAN BEFORE. NOW WON'T START AT ALL. NEW PLUG, CHANGED OIL AND FILTER, HAS A GOOD SPARK.


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I have a older mmodel 318 riding mower with an onan motor. wruns very well but when it is hot outside it will shut down withinabout a minute the power will reinitiate and the tractor can be restarted ....


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No spark


did you make sure the gap was set right on coil & flywheel it should be .020 between magnet on flywheel & the coil & the same thing with the points in the open possition between points & condensor

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1 Answer

JOHN DEERE 318 LAWN TRACTOR WONT START


ok, since you have the points, I assume you have the B43g Onan
engine. Was it running before the new parts were installed?
Check your point gap and make sure it is .016, plugs ahould be gapped at .025 Make sure your plug wires are good too. Should be somewhere between 0 and 10,000 ohms per foot, when measured with an ohmmeter. Once everything is rechecked for gap distance, make sure there is no spark by pulling plug out, leaving wire on and ground the outside of plug to the chassis of the tractor.
Crank over and look for the spark. Coils are about $100, so you want to eliminate everything else first.
Diagnosing a points ignition for no spark is really simple. Do you have 12V at the coil? Do you get a spark when you connect and disconnect the negative terminal of the coil to ground? If not you have a bad coil.

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1 Answer

Fuse blows when engage blade


The electro-magnetic coil side of your PTO is shorted out.On the 318 it is very easy to replace,just under front screen.

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