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  1. #1
    Petty Officer 2nd Class
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    Default 1968 johnson 3hp water pump replacement

    Hi, can someone walk me through the replacement procedure for the water pump impellor on a 2 cylinder johnson 3hp twin, 1968 model? I have done this on newer motors but I am looking for a step by step procedure (this is a direct drive motor) (no forward or reverse shift) thanks in advance.

  2. #2
    Vice Admiral 1946Zephyr's Avatar
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    Default Re: 1968 johnson 3hp water pump replacement

    Remove the 4 bolts that secure the lower unit to the mid section and then wiggle it free. That's it. Once you get the lower unit off, you'll see a housing with 4 screws on it and the impeller is under there.
    Vice Admiral Zephyr

    1941 Johnson HD-20 (in restoration)
    1947 Sea King 5hp
    1948 Evinrude Sportsman
    1949 Martin "40"
    1951 Evinrude Fastwin
    1954 Evinrude Fleetwin
    1955 Evinrude Fleetwin
    1955 Johnson JW-11
    1955 Johnson CD-12 (2)
    1955 Johnson QD-16
    1955 Johnson RD-17
    1957 Jhnson CD-14
    1957 Evinrude Big Twin
    1958 Evinrude Fisherman
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    1974 Tanaka 1hp (screamin' drink mixer )

  3. #3
    Petty Officer 2nd Class
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    Default Re: 1968 johnson 3hp water pump replacement

    so, being direct drive, there is no shift linkage to deal with. iboats lists an impellor kit and a water pump kit with different part #'s. what do you think i will need as far as parts go?

  4. #4
    Commander lindy46's Avatar
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    Default Re: 1968 johnson 3hp water pump replacement

    Take it apart and see how the housing and plate look. If the housing is not corroded/cracked and the plate is flat/smooth and not rusted, then you probably only need the impeller. Try not to pull the driveshaft out of the gearcase when you do the job, as it can be frustrating trying to mesh it back into the pinion gear splines.

  5. #5
    Lieutenant Commander kbait's Avatar
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    Default Re: 1968 johnson 3hp water pump replacement

    Lindy speaks truth! I had to drain/disassemble one as I could not get it re-aligned. The good part is that there is nothing in this life simpler than a 3hp gearcase!
    It's almost beyond the point of bearable how torturous it is to try to have any dignity in being a Vikings fan..

  6. #6
    Vice Admiral 1946Zephyr's Avatar
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    Default Re: 1968 johnson 3hp water pump replacement

    Yea, you don't want to pull the drive shaft. I have on one, but fortunately, I lined things back up easily enough and didn't have an issue, but from what I see, the pinion gear will be able to move around feely, if the drive shaft comes out.
    Vice Admiral Zephyr

    1941 Johnson HD-20 (in restoration)
    1947 Sea King 5hp
    1948 Evinrude Sportsman
    1949 Martin "40"
    1951 Evinrude Fastwin
    1954 Evinrude Fleetwin
    1955 Evinrude Fleetwin
    1955 Johnson JW-11
    1955 Johnson CD-12 (2)
    1955 Johnson QD-16
    1955 Johnson RD-17
    1957 Jhnson CD-14
    1957 Evinrude Big Twin
    1958 Evinrude Fisherman
    1958 Johnson FDE-12
    1959 Johnson RDSL-21B
    1974 Tanaka 1hp (screamin' drink mixer )

  7. #7
    Fleet Admiral HighTrim's Avatar
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    Default Re: 1968 johnson 3hp water pump replacement

    If that drive shaft does come out.....a little trick I heard about, is to hold onto it with the prop shaft pointing down. Front of gearcase pointing UP so pinion gear will fall back down into place. Turn prop shaft back and forth a tiny bit while dropping drive shaft back into the pinion gear.

    It is a bit tedious, be it should go. Quicker than taking it all apart.

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