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  1. #1
    Member
    Join Date
    Jun 2019
    Location
    Alabama
    Posts
    8

    Optimax 150 dropped rpm while at cruise, rough idle

    1B481956, APR 2007, 150XL OPT

    Coming home from offshore trip, engines running steady at 4000 rpm, starboard engine dropped rpms over 3-4 seconds and died. Will crank and idle rough but won’t turn up rpms.

    No alarms.

    No water in separator.

    Any thoughts?

  2. Member
    Join Date
    May 2011
    Location
    Spangle, WA
    Posts
    6,180
    #2
    Better check the compressor...
    _______

    Phil
    '09 Hewescraft ProV
    '09 150 Optimax


  3. Member
    Join Date
    Jun 2019
    Location
    Alabama
    Posts
    8
    #3
    Thanks for the suggestion.

    Engine will idle with no odd noises coming from compressor. Removed belt and no slop apparent on compressor shaft.

    What else should I check before seeking out a mechanic?

    Thanks,

    Jamey

  4. Member
    Join Date
    Jun 2013
    Location
    LONGVIEW TEXAS
    Posts
    13,941
    #4
    compression
    .................................................. ...the scariest thing in life is the unknown ...................................