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  1. #1
    Seaman
    Join Date
    Feb 2002
    Location
    san antonio
    Posts
    70

    Default 40hp merc outboard have thermostat

    I have a merc outboard 40 hp ser#555407 Does this have a thermostat? water does not come out of tail tale stream at idle.any help would be appreciated

  2. #2
    Cadet
    Join Date
    Nov 2001
    Location
    Slidell, LA
    Posts
    25

    Default Re: 40hp merc outboard have thermostat

    Tex,Had this problem with my Mariner and got awsome help on this board. Turned out that I had trash in the pee hole right at the outlet. Try cleaning that first with a straightened paper clip or a pipe cleaner and see if that don't fix it.When did you last change the pump impeller?Case

  3. #3
    Seaman
    Join Date
    Feb 2002
    Location
    san antonio
    Posts
    70

    Default Re: 40hp merc outboard have thermostat

    Thanks for the quick responce ill try cleaning the hole. its been about two years i guess its time to change

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