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  1. #1
    Member
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    Jul 2011
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    Grain Valley Mo
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    JD 855

    Default Onan P218G not allot of spark

    Hi there ive searched and searched about this...I have a Miller Legend welder with this engine that wont start. Ive put a new coil/plugs,wires on it and checked the ignition modgle showing its good but the only time I get spark is when i firet got to start it I get 1 single spark. The stator isnt hooked up I found out and the voltage regulator is missing...Do i need these 2 pieces to run this or is that just for charging the battery? Thanks so much!!
    1990 855 with 72" mmm.
    Model 52 front End Loader

  2. #2
    Veteran Member JerryK's Avatar
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    Feb 2004
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    Vanderbilt, Michigan, USeh?
    Tractor
    Mahindra 5035, JD 2240, 420

    Default Re: Onan P218G not allot of spark

    The ignition module behind the flywheel .... Mine worked fine until it got a little warm. That's what fires the coil each time the magenet on the flywheel passes it... bet it is bad even though you think it is OK. My Onan just has a rectifier that the alternator coils go thru, no regulator.... All it is made for is to run a few lights and charge the battery... not something that is voltage sensitive like a radio or something.

  3. #3
    Member
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    Jul 2011
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    Grain Valley Mo
    Tractor
    JD 855

    Default Re: Onan P218G not allot of spark

    ugh I dont want to have to pull that dang flywheel I hear its a bear..... I better get a how to guid so I dont jack it up....Should I replace the trigger ring to?
    1990 855 with 72" mmm.
    Model 52 front End Loader

  4. #4
    Veteran Member JerryK's Avatar
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    Feb 2004
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    Vanderbilt, Michigan, USeh?
    Tractor
    Mahindra 5035, JD 2240, 420

    Default Re: Onan P218G not allot of spark

    I did not have any trouble pulling the flywheel on mine. It was in a JD 420 garden tractor. The big thing was pulling the motor out of the frame so I could get to everything. Good time to put brushes in the starter and a new solenoid since my motor has to be out to get to that stuff. Don't know what you mean by trigger ring, but if you mean the magnet, it is probably OK. The ignition modules are notorious failures on these engines....

  5. #5
    Member
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    Jul 2011
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    Grain Valley Mo
    Tractor
    JD 855

    Default Re: Onan P218G not allot of spark

    ahh ok the good thing is its on the welder and I just have to remove the guards (faceplate) to get to the flywheel...maybe wont be a big deal...Just an $$$$ part.
    1990 855 with 72" mmm.
    Model 52 front End Loader

  6. #6
    Member
    Join Date
    Jul 2011
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    Grain Valley Mo
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    JD 855

    Default Re: Onan P218G not allot of spark

    Wow JD wants 162.91 for it!!!
    1990 855 with 72" mmm.
    Model 52 front End Loader

  7. #7
    Veteran Member JerryK's Avatar
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    Vanderbilt, Michigan, USeh?
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    Mahindra 5035, JD 2240, 420

    Default Re: Onan P218G not allot of spark

    It is an Onan part and you can get it on Ebay or Amazon probably... The flywheel is on a tapered shaft. JD recommends that you keep it from turning by putting one or two Vise Grips onto the ring gear, don't try to stick something in the big cast cooling fins and break one. Also, when it pops loose, and it will, have someone there to keep your wheel puller, Vise Grips, and your nice cast flywheel with the big fins from falling on the floor. They recommend that you just loosen the flywheel bolt a few turns if you are by yourself. [ ] [ wonder how much one of them there flywheels cost at JD...??? ]
    Last edited by JerryK; 02-07-2013 at 03:57 PM. Reason: spell check....

  8. #8
    Member
    Join Date
    Jul 2011
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    Grain Valley Mo
    Tractor
    JD 855

    Default Re: Onan P218G not allot of spark

    cool thanks!! oh i hate to even guess I have read that they are killer heavy.
    1990 855 with 72" mmm.
    Model 52 front End Loader

  9. #9
    New Member
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    Dec 2012
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    Location
    Minnesota
    Tractor
    Case

    Default Re: Onan P218G not allot of spark

    rkboyer
    may i suggest you join the yahoo onan engine site ( just google it )
    they have the parts and service manuals ava.
    the trigger ring ( ign. rotors ) can get bad ( usually the black plastic ones )
    when one or more of the magnets get bad.
    did you check the module by the book?
    the manual will tell how to test the stator as well.
    i stock all of these parts used ( tested )
    boomers_influence@yahoo.com
    651 437 2826
    new parts ava. at onanparts.com
    thank you. boomer ( the used onan engine parts guy )

  10. #10
    Gold Member
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    Jan 2006
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    Location
    Stone Mountain, GA
    Tractor
    Case 1210, Mitsubishi D2050

    Default Re: Onan P218G not allot of spark

    There are all kinds of parts on eBay for sale. The modules start at about $50.

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