• If this is your first visit to the iboats.com Boating Forums, be sure to check out the FAQ. To post a question or comment, begin by signing up. To start viewing messages, select the forum that you want to visit from the selection below.

Announcement

Collapse

Help Tip: If you have a question that has not been answered to your satisfaction in the archives, it is always best to start a new thread of your own. By starting your own thread, you will receive the maximum number of views by forum members.

Below are some additional forum policies in hopes of all iboats members will follow, Thank you.

1. Please do not reply to old topics or hijack existing topics. Old topics of a technical nature are like a library book, Please do not write in them.

2. Old topics should be considered archives and used for reference only. Please do not reply to them.

3. Do not take over someone elseís topic (aka hijack) with your own question, even if it is similar. If you have a question that has not been covered to your satisfaction in the archives, it is always best to start a new topic of your own.

4. If you have a question for the original poster (OP) and the topic is over 30 days old, send the OP a PM, he may not even visit the forums any longer, or may not notice your question in the old topic.

5. By starting your own topic, you will receive the maximum number of views by forum helpers that may not even notice your question when itís posted at the end of someone elseís topic. And those answers will be specific to your particular issue.

6. Please do not post to topics that have been inactive for more than 3 months unless you are the original poster. We have very active forums and any topic that remains inactive for that long should be considered "dead". It is especially confusing when there is an entirely new question posted to an old topic.

7. Posting at the end of any topic is considered to be hijacking the original posters topic which in turn subjects the topic to be closed if it continues to happen thus not making it fair to the original poster in the future had for some reason he/she needed to return for additional information or provide an update of the problem solved which is always welcomed within a reasonable amount of time frame.

8. Please note that you should see a red banner pop up near the bottom of each inactive topic asking you not to reply to old topics. The Red banner will read: Please note this topic has been inactive for 90 days. For the best results, please start a new topic.

Thank you all in advance for doing your part in helping iboats run a smooth ship.

Additional forum rules linked below.
http://forums.iboats.com/forum-rules-guidelines-405/
See more
See less

how to check for bad impeller

Collapse
X
  • Filter
  • Time
  • Show
Clear All
new posts


  • 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

    Comment



    • #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?

      Comment



      • #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

        Comment



        • #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.

          Comment



          • #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.

            Comment



            • #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

              Comment



              • #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.

                Comment



                • #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.

                  Comment



                  • #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.

                    Comment



                    • #11
                      Re: how to check for bad impeller

                      it only takes me 15 minutes on my Cobra

                      Comment



                      • #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

                        Comment



                        • #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!"

                          Comment



                          • #14
                            Sign up today
                            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

                            Comment


                            Working...
                            X