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Replacing Impellers/water pump on a 1977 Evinrude 70 hp Mod # 707739

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  • Replacing Impellers/water pump on a 1977 Evinrude 70 hp Mod # 707739

    I am going to hopefully finally buy a motor for my 16' boat. I am looking at a 70 hp this time. It's an Evinrude, 1977, 70 hp, mod #707739, (two model #'s that year 70773/70779 as listed in engine ref chart.) The motor has sat for three years. Plan on doing some carb work, not sure how much, maybe completely rebuild them. Carb work is no problem. I also want to replace the impellers/water pump per recommendations from many people. I have better than average mechanical skills, but I have limited shop space so would have to work on this in my driveway. I have never done this type project before.

    Finally, my question; How difficult is this project and is it one that could be done in a driveway by someone with a reasonable set of skills?

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    Last edited by Bubbasboat; April 7th, 2014, 04:52 PM.

  • #2
    Re: Replacing Impellers/water pump on a 1977 Evinrude 70 hp Mod # 707739

    The first thing I would do is get an OEM factory service manual. It will also help you when you have other probs with the motor.

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    • #3
      Re: Replacing Impellers/water pump on a 1977 Evinrude 70 hp Mod # 707739

      Yes, a manual makes perfect sense. I looked at the link provided. $30.00, worth every penny!! I will also take your answer to imply this could be done in a driveway. If that's not so, please correct me!!

      Originally posted by boobie View Post
      The first thing I would do is get an OEM factory service manual. It will also help you when you have other probs with the motor.

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      • #4
        Re: Replacing Impellers/water pump on a 1977 Evinrude 70 hp Mod # 707739

        Yes it can be done in a driveway. Down here in FL we do a lot work outside all the time.

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        • #5
          Re: Replacing Impellers/water pump on a 1977 Evinrude 70 hp Mod # 707739

          Here in Colorado, as we say, "Spring time in the Rockies". Overnight we can go from 76 deg to 3 ft of wet heavy snow!

          Not having done this before, how much time should I allot myself, a day or?

          Originally posted by boobie View Post
          Yes it can be done in a driveway. Down here in FL we do a lot work outside all the time.

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          • #6
            Re: Replacing Impellers/water pump on a 1977 Evinrude 70 hp Mod # 707739

            You being new to this, I can't really answer that. Good Luck.

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            • #7
              Re: Replacing Impellers/water pump on a 1977 Evinrude 70 hp Mod # 707739

              Id take about an hour or so and im no professional, thatd be having a cup of tea during it too.
              So long as you have all the sockets/spanners around and you arent looking all over your place for the right sized sockets then about three hours should cover it for your first time.
              Just make sure you undo the shift shaft first, you dont want the motor being hung up by that.

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              • #8
                Re: Replacing Impellers/water pump on a 1977 Evinrude 70 hp Mod # 707739

                Tea hell, how about a beer ??

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                • #9
                  Re: Replacing Impellers/water pump on a 1977 Evinrude 70 hp Mod # 707739

                  Originally posted by boobie View Post
                  Tea hell, how about a beer ??
                  whiskey tea, better than warm beer...

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                  • #10
                    Re: Replacing Impellers/water pump on a 1977 Evinrude 70 hp Mod # 707739

                    Just yesterday I pulled 2 and reinstalled one in about 2 hrs. Changing the water pump probably would have added another 1/2 hour. Then after I test the one I put on I'll pull it again and put the original back on.

                    Not a hard job as long as the bolts are not all corroded.


                    1984 Lund S14 DLX, 35hp Evinrude on a Spartan Roller Tilt trailer. Sold to little brother.
                    1988 Alumacraft Classic 16 under reconstruction.
                    1984 Sea Nymph FM144 Pike Attacker, 1994 Johnson 30hp

                    195? Rich Line 14', the stump bumber

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                    • #11
                      Re: Replacing Impellers/water pump on a 1977 Evinrude 70 hp Mod # 707739

                      You will be fine
                      Last edited by dodgeman67; April 10th, 2014, 09:00 AM. Reason: Hijacked

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                      • #12
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                        Re: Replacing Impellers/water pump on a 1977 Evinrude 70 hp Mod # 707739

                        Dodgeman, It's also not nice to hi-jack a thread. Read the rules at the top of the forum. Gets less confusing.
                        Last edited by boobie; April 10th, 2014, 12:51 PM.

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