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onan gennerator blow back

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Junkman
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2020/06/03 15:38:54 (permalink)
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onan gennerator blow back

I have an onan gen set in a motorhome. was not getting fuel so I changed the carb then it tries to start, but soon blows fuel back out the carb. I suspect a burnt valve?? open to ideas before I pull it out.

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    AVB
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    Re: onan gennerator blow back 2020/06/04 07:16:46 (permalink)
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    I haven't worked on any these genesets but you need it where you can access it. I am thinking these are L-head engine so the valve clearance probably closed up from wear which leading to valve not closing fully and fast enough.
    TownsendsFJR1300
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    Re: onan gennerator blow back 2020/06/12 20:05:15 (permalink)
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    A "leak down" test will give you a good idea of the health of the engine and point you in the right direction of any issues. 
     
    IE, air coming out the carb(intake valve) would indicate an intake valve too tight/ leaking, etc..

    Scott
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