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Thread: how to diagnose valve float?
          
   
   

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  1. #1
    BigTruckDriver is offline CHR Member/Contributor Visit my Photo Gallery
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    how to diagnose valve float?

     



    are other ways to diagnose or should i use a vacuum gauge?
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  2. #2
    Dave Severson is offline CHR Member/Contributor Visit my Photo Gallery
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    first thing to check would be your valve spring pressure. Generally, if your valves are floating you'll get backfires, through the tailpipe and the carb, and usually some broken parts when valves start pounding on pistons....
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  3. #3
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    HOSS429 is offline CHR Member Visit my Photo Gallery
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    good time for a lot of us to learn something .. i had associated " valve float " with weak springs .. hence not closing the valve quick enuff .. can that also cause " valve bounce ".. and also lifter bleed down at hi speed .. does that also give valve float or bounce symptoms .. hence the old bragging phrase '' " iv`e got anti pump up lifters "'' what do anti pump up lifters cure ??

  4. #4
    nmrajames is offline CHR Member Visit my Photo Gallery
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    I second the recommendation to check valve spring pressure. You should or could also feel a loss in power during acceleration at a certain rpm. Of course, by then you're entering into the danger territory.

  5. #5
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    Geronimo is offline CHR Member Visit my Photo Gallery
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    I had a lifter going flat. It was like an intake leak. Didn't notice it 'till I pulled the valve cover when it was running. You could see it plain as day. Would image valve float would have the same symptom under light loads.

  6. #6
    erik erikson's Avatar
    erik erikson is offline CHR Member Visit my Photo Gallery
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    Valve Springs

     



    I would like to add everytime you "float" your springs it will accur earlier the next time you decide to rev. the engine up.

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