Question about Craftsman 42 in. Deck 19.5hp Lawn Tractor

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JOHN DEERE 318 LAWN TRACTOR WONT START

REPLACED PLUGS, POINTS AND CONDENSER, WONT TURN OVER, COULD IT BE COIL? HOW CAN I TEST IT

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  • trplumley May 18, 2009

    it cranks, but won't start, no spark. what's left other than the coil? Thanks

  • rattosh51 May 11, 2010

    Won't turn over, as in won't crank at all? Or cranks but doesn't start?

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  • 69 Answers

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.

Posted on May 19, 2009

  • rattosh51 May 19, 2009

    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.

  • TONY STRUNK
    TONY STRUNK Nov 18, 2013

    thanks will try

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Tools needed:
volt meter to read 12 volts, or test light

1) with the points open: is there voltage at the connection wire at the points
If yes; adjust points to .020" and try to crank engine and check for spark
*** you may want to determine if condensor is connected to this wire also
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if no
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