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    Boatdoctor's Avatar
    Boatdoctor Posts: 1, Reputation: 1
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    #1

    May 15, 2012, 06:43 PM
    Briggs and stratton 18.5 ohv intek service manual
    The mower runs great and has 120# cranking compression.. After 3-5 minutes starts smoking.. hot or cold.. I thought oil ring. Just ask expert said no it's the intake valve seal.. replaced it and still smokes same.. breather and exhaust not pluged. I feel it has to be oil ring or cracked piston. Would like to find procedure to do ring job and what other parts I should change while apart. I used partstree.com and they were spot on. Any suggestions?? Thank You.. Bruce--->
    crigby's Avatar
    crigby Posts: 4,343, Reputation: 107
    Outdoor Power Equipment Expert
    		  
    #2

    Jun 28, 2012, 01:03 PM
    Hi,
    A blown head gaskey will cause a crnkcase pressure problem, also.
    Peace,
    Clarke
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