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  1. #1

    Default What is hole in the side of water pump base

    Confused as to what the hole in the side of the base part of pump.

    It goes into the high pressure side of the pump

    1983 70hp mercury 3 cylinder

    Thanks
    Milton
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  2. #2
    Join Date
    Nov 2011
    Location
    tennessee
    Posts
    3,559

    Default Re: What is hole in the side of water pump base

    That should mate with the flush plug on outside of housing if equipped. I dont remember the 83 models with a flush plug, mainly the old small I2 and I4 motors. If it goes all the way thru its likely for a old 50hp. The correct one will have the hole but it will be blocked off.
    Pappys Sales and Service
    Owner and Factory Certified Technician
    Former racer KDBA (Kentucky Drag Boat Association)

  3. #3

    Default Re: What is hole in the side of water pump base

    Quote Originally Posted by faztbullet View Post
    That should mate with the flush plug on outside of housing if equipped. I dont remember the 83 models with a flush plug, mainly the old small I2 and I4 motors. If it goes all the way thru its likely for a old 50hp. The correct one will have the hole but it will be blocked off.
    Thanks for your post.

    There is also a 1/16" hole on the end that goes into the high pressure side of the pump.

    Trying to figure out how to get the right part. ???

    Milton

  4. #4
    Join Date
    Nov 2011
    Location
    tennessee
    Posts
    3,559

    Default Re: What is hole in the side of water pump base

    The 1/16 is a drain hole...you should need a
    46-77177A1 base
    Pappys Sales and Service
    Owner and Factory Certified Technician
    Former racer KDBA (Kentucky Drag Boat Association)

  5. #5

    Default Re: What is hole in the side of water pump base

    Thanks
    Milton

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