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how to check for bad impeller

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  • how to check for bad impeller

    99 mercruiser 3.0 woundering how you can tell or check to see if the impeller is bad. Thanks

  • #2
    Re: how to check for bad impeller

    I suspect the answers you will get is if you haven't replaced it in 2 years, its bad, replace it.

    If you are running hot, its bad replace it.
    1997 SeaRay 175
    3.0LX Mercruiser
    Alpha 1 Gen 2

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    • #3
      Re: how to check for bad impeller

      i just bought the boat so i am not sure if it has been replaced or not but engine is not running hot. i have just been seeing alot of post talking about them thought i might want to check to see if mine is working. How hard are they to change and how expensive are they?

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      • #4
        Re: how to check for bad impeller

        Originally posted by cmanion View Post
        i just bought the boat so i am not sure if it has been replaced or not ......
        It is a good idea to replace it. Then you will know.
        Terry
        87, 4WINNS H 190
        470/Alpha I

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        • #5
          Re: how to check for bad impeller

          They're not terribly expensive, a relative bargain compared to the expense that ignoring them will cause.

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          • #6
            Re: how to check for bad impeller

            You pull it off, install a new one and consider it checked. An impeller isn't something to inspect. Change it yearly and have no worries.

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            • #7
              Re: how to check for bad impeller

              Have a look at this link, think you might need it soon:
              http://www.mercstuff.com/howdoi.htm

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              • #8
                Re: how to check for bad impeller

                There is no way to inspec the impeller without removing it. A bad impeller will have pieces missing. Like others have said, if you are unsure how old it is, it is a good idea to replace it. The problem is that an old impeller might look ok, but can go bad soon after.

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                • #9
                  Re: how to check for bad impeller

                  I just spent $700 and 12 hours of work on my overheating issue, to eventually find out that my NJEW impeller was the cause of a flow which was too low to sufficiently cool my engine. The Sierra brand impeller was defective, and I'm currently in the process of sending it back to Sierra for a warranty claim.
                  I think I will change my impellers EVERY YEAR now, instead of every 2 years, like I have been.

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                  • #10
                    Re: how to check for bad impeller

                    They are cheap. If you are a decent wrench you can do it yourself in a couple of hours.

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                    • #11
                      Re: how to check for bad impeller

                      it only takes me 15 minutes on my Cobra

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                      • #12
                        Re: how to check for bad impeller

                        Originally posted by Dakota47 View Post
                        it only takes me 15 minutes on my Cobra
                        piece of cake on a cobra. On a Merc you have to take the lower unit off... a lot more work and seals to replace

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                        • #13
                          Re: how to check for bad impeller

                          At risk of beating the horse, I would definitely go ahead and replace it. I would say keep the old one as an emergency spare if it still looked good, but apparently an "on-the-water" swap is not possible with your merc (based on above post).

                          My VP impeller is right at the front of the motor...16 screws gets the bench seat loose, and another four gets me into the impeller housing.

                          My old one will at least get me to shore in a pinch.

                          Better yet, sell your old one on eBay as "slightly used"...some poor sap who doesn't frequent iBoats will buy it...

                          I'm kidding, of course.
                          2007 Stingray 180RX VP 3.0 GLP-E SX-A Pulled by a 2007 Chevy Tahoe 5.3L
                          sigpic
                          "stupidity is usually painful and expensive, as it should be"
                          Actual quote from my boss, "You have no idea who I think I am!"

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                          • #14
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                            Re: how to check for bad impeller

                            Thanks for all the input I am going to order my replacement tom. and put it in I would much rather be safe than sorry. Thanks again, Chris

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