Valve adjustment on a briggs engine

Sean McGillicuddy Posted By Sean McGillicuddy, Oct 11, 2018 at 6:50 PM

  1. Sean McGillicuddy

    Sean McGillicuddy
    Minister of Fire 2.
    NULL
    

    Jan 7, 2012
    605
    241
    Loc:
    Easton Mass. not enough time in NB Canada
    I have watched how to fix this problem..


    What causes this to happen ?
    How can you prevent it ?
     
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  2. festerw

    festerw
    Feeling the Heat 2.
    NULL
    

    Nov 16, 2009
    290
    55
    Loc:
    Cambridge Springs, PA
    Wear, vibration and heat.

    The two cylinder models are a pain in the butt. I've had mine apart 3 times. 1st time the pushrods dropped and bent, 2nd time I just noticed them getting loose, 3rd time another set if pushrods and the bronze bushing were walking out of the head. Not terribly thrilled with it considering it has less than 200 hours on it.

    From what I've read heat is the biggest problem, I've got problems with mice building in it and the nests plugging up the cooling fins.
     
  3. Jags

    Jags
    Moderate Moderator 2.
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    Staff Member

    Aug 2, 2006
    17,924
    6,450
    Loc:
    Northern IL
    Typical wear on small OHV engines. The manual actually states that this is a maintenance item to be addressed. The motor he was working on is the same motor I have on my small splitter. Although not as bad as the one in the above vid, it is starting to get the same heavy compression on startup. That tells me its time for an adjustment.
     
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  4. Sean McGillicuddy

    Sean McGillicuddy
    Minister of Fire 2.
    NULL
    

    Jan 7, 2012
    605
    241
    Loc:
    Easton Mass. not enough time in NB Canada
    .04 thousands or .004 ?
     
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  5. festerw

    festerw
    Feeling the Heat 2.
    NULL
    

    Nov 16, 2009
    290
    55
    Loc:
    Cambridge Springs, PA
    Should be .004

    Attached is a pdf from Briggs with the specs for their models.
     

    Attached Files:

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  6. Isaac Carlson

    Isaac Carlson
    Feeling the Heat 2.
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    Nov 19, 2012
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    I had a bad needle valve on a carb and it would slowly flood the cylinders with fuel, making it behave the same way. I installed a shutoff and no more problems.
     
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