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How to relpace points on a john deere 318 onan motor

Wont start think we need to replace points need to no how

Posted by Anonymous on

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6ya6ya
  • 2 Answers

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Posted on Jan 02, 2017

  • 69 Answers

SOURCE: 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.

Posted on May 19, 2009

  • 69 Answers

SOURCE: HAVE A JOHN DEERE 318 LAWN TRACTOR, CHANGED POINTS

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

  • 850 Answers

SOURCE: Is there a way to test the ignition condensor on

not worthtesting just replace it if its suspect as they are only cheap to buy & easy to fit

Posted on Jul 25, 2009

nova2nv
  • 197 Answers

SOURCE: john deere 318 wiring diagram I replaced an bg 316

Purple wire goes to the solenoid on starter.If you installed starter with single wire post all you have to do is mount a solenoid to the frame just in front of starter,existing batt/starter cable goes to one solenoid post,purchase a short red cable and install on other solenoid post and run it to the starter,plug purple wire into new solenoid and the way you go.

Posted on Nov 16, 2009

Testimonial: "This was great advise bought a solenoid and away i go thx"

  • 110 Answers

SOURCE: I'm wanting to change points & condenser

At that age, it's highly likely that there aren't any! You don't say what engine is fitted, but if it's a Briggs or a Tecumseh, they went solid state in 1982. If that's the case, just replace the coil module.

Posted on May 12, 2010

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How do you get to the starter bolts on a john deere 318 with onan B43G engine


Visit the on-line store, know as reliable-store, they have the repair manuals. I'm sure you will get the solution of your problem.
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Apr 29, 2017 | John Deere Garden

1 Answer

My 318 John Deere mower blades would not turnoff. The switch would not move. Even when I got off the seat the mower blades continued. I turned the motor off and now it won't start. Any idea?


Faulty attachmentment switch, replace it as it is sending a signal that it is engaged to your starter circuit, that is why it wont start.
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John deere 318 wiring diagram I replaced an bg 316 onan with an bg 318 onan new the starter only has one bolt for wires the old one has a bolt and a plug on where does the purple wire go on this new...


Purple wire goes to the solenoid on starter.If you installed starter with single wire post all you have to do is mount a solenoid to the frame just in front of starter,existing batt/starter cable goes to one solenoid post,purchase a short red cable and install on other solenoid post and run it to the starter,plug purple wire into new solenoid and the way you go.

Sep 28, 2009 | John Deere Garden

1 Answer

Is there a way to test the ignition condensor on an 18 hp onan engine in a 318 John deere lawn tractor.


not worthtesting just replace it if its suspect as they are only cheap to buy & easy to fit

Jul 25, 2009 | Garden

1 Answer

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 ....


possibly a carb or coil problem. does it have point type ignition? if so try replacing the condensor.if nothing else changes try replacing the fuel filter. then nothing,a float sticking in the carb or a bad coil.

Jul 12, 2009 | John Deere 420,1020,2010,2020,2510,2520...

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.

May 18, 2009 | Craftsman 42 in. Deck 19.5hp Lawn Tractor

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