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  1. #1
    Member
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    Jun 2006
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    deridder
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    2005 225 hpdi lower unit knocking

    Does any of the gears or shafts turn while unit is in neutral. Its making a knocking sound in forward and reverse but while in neutral it knocks but it seems not as bad in neutral. Any help.

  2. Member
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    Jun 2006
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    deridder
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    #2

    Re: 2005 225 hpdi lower unit knocking (bayoubeagler)

    Come on anyhelp before I take it to the shop?

  3. Member
    Join Date
    Jun 2007
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    Mountain Home AR.
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    4,198
    #3

    Re: 2005 225 hpdi lower unit knocking (bayoubeagler)

    Both forward & reverse gears turn with the drive shaft. The dog clutch locks the gear selected to the propeller shaft when you shift. I would have it checked before more damage is done.
    Good luck! Peter.
    2018 Z521L 250 PRO XS V8

  4. Member BADAZZTRITON's Avatar
    Join Date
    Dec 2006
    Location
    Louisiana
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    2,663
    #4

    Re: 2005 225 hpdi lower unit knocking (howieranger)

    Can you say blown powerhead ? When the motor is in neutral, only 4 cylinders are firing. When you put it in gear, all cylinders are firing then. That's what mine did when one of my piston rods broke in two. Nothing ever seized up, but every time the motor would turn over the rod would go up and hit the bottom of the piston = KNOCKING NOISE ! Hope that's not what it is, but it sure sounds fishy !

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