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Sounds like a busted water pump impeller shaft?

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  • #1

    Question : Sounds like a busted water pump impeller shaft?

    I'm finishing my 3.4L/4L60E swap into my 1981 Chevette, but when I shut the engine off I hear what sounds like the water pump impeller continuing to spin for a few seconds afterward.
    I was absolutely certain that it was a busted water pump impeller shaft, but I removed the water pump today and to my surprise it's just fine, what else could be making this noise (the electric fan is unplugged).
    sigpic
    "It's your car. Do with it what you wish, but as you enter this unknown world you will need to invent the wheel all over again. For the adventurous and those that are backyard mechanics who have nothing but time you might like this. Most have plenty of frustrating moments and the process usually takes significantly longer then what anyone could imagine. The end result of this conversion is completely up to you." - Jon McCullough of BMCautos.com
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  • #2
    I'm not sure what was making this sound but it quit a couple days ago.
    sigpic
    "It's your car. Do with it what you wish, but as you enter this unknown world you will need to invent the wheel all over again. For the adventurous and those that are backyard mechanics who have nothing but time you might like this. Most have plenty of frustrating moments and the process usually takes significantly longer then what anyone could imagine. The end result of this conversion is completely up to you." - Jon McCullough of BMCautos.com

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    • #3
      That is sometimes the worst... Trying to track down a sound, only for it to go away. I usually wonder if that means failure is about to happen, or if it just fixed itself.
      -Brad-
      89 Mustang : Future 60V6 Power
      sigpic
      Follow the build -> http://www.3x00swap.com/index.php?page=mustang-blog

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      • #4
        Since there are so many new parts, mods, and the variable of the junkyard engine, and my first carb to EFI swap... I'm just not sure what to expect.
        sigpic
        "It's your car. Do with it what you wish, but as you enter this unknown world you will need to invent the wheel all over again. For the adventurous and those that are backyard mechanics who have nothing but time you might like this. Most have plenty of frustrating moments and the process usually takes significantly longer then what anyone could imagine. The end result of this conversion is completely up to you." - Jon McCullough of BMCautos.com

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        • #5
          Find a good microphone and use it to find the source of the sound. Place it around various spots (safely) and record the noise you hear. As you get closer to the culprit the decibles will rise. Might be hard for the ear to distinguish but a laptop can do that easily.

          Hopefully this will pinpoint the source, and thus the issue

          Strange noises are a pita. What else spins at a high enough RPM to make a noise for a few seconds?

          Distributor, oil pump, alternator, P/S, heater blower (lol)???
          Last edited by TGP37; 09-10-2011, 09:15 AM.
          1996 Grand Prix | 3100v6 L82 | T04E-50 Turbo | Getrag 282 w/ EP LSD | SPEC-3 Clutch

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          • #6
            I borrowed a stethoscope to check it out but the sound stopped before I could, figures.
            Hopefully whatever it was doesn't come back to haunt me... too soon
            sigpic
            "It's your car. Do with it what you wish, but as you enter this unknown world you will need to invent the wheel all over again. For the adventurous and those that are backyard mechanics who have nothing but time you might like this. Most have plenty of frustrating moments and the process usually takes significantly longer then what anyone could imagine. The end result of this conversion is completely up to you." - Jon McCullough of BMCautos.com

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            • #7
              Ahh, I see. I got to remember most people who post here are quite intelligent.

              Well, whatever it was, it was spinning. That rules out a lot, but not enough. Hhahaa.

              It's a shame you didn't get to record it. Then I could tell you how fast it was spinning by the sound. That can isolate it quickly.
              1996 Grand Prix | 3100v6 L82 | T04E-50 Turbo | Getrag 282 w/ EP LSD | SPEC-3 Clutch

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              • #8
                I think I know what I was hearing but it sorta makes me look foolish.
                Again, this is my first carb to EFI conversion and some of this has been new to me.
                Due to my surge tank setup I have a high pressure fuel pump under the hood.
                I'm pretty sure I was hearing it spin down at first while the surge tank was still mostly empty, draining back to the surge tank through the supply line.
                Now that the entire fuel system is done and topped off with gas I don't hear the sound anymore.
                sigpic
                "It's your car. Do with it what you wish, but as you enter this unknown world you will need to invent the wheel all over again. For the adventurous and those that are backyard mechanics who have nothing but time you might like this. Most have plenty of frustrating moments and the process usually takes significantly longer then what anyone could imagine. The end result of this conversion is completely up to you." - Jon McCullough of BMCautos.com

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                • #9
                  Originally posted by TechRod View Post
                  I think I know what I was hearing but it sorta makes me look foolish.
                  Again, this is my first carb to EFI conversion and some of this has been new to me.
                  Due to my surge tank setup I have a high pressure fuel pump under the hood.
                  I'm pretty sure I was hearing it spin down at first while the surge tank was still mostly empty, draining back to the surge tank through the supply line.
                  Now that the entire fuel system is done and topped off with gas I don't hear the sound anymore.
                  Nah, you don't look foolish. You actually appear meticulous, which is a good thing lol.

                  I'v had my moments. My greatest issue ever was the Crank Sensor wire. I mixed it up with another pigtail that was identical except the PPL/YEL alignment was reversed. Making the polarity reversed and timing was royally screwed up. Took me weeks and hundreds of false leads replacing things. I replaced the Ign controller, all major power cables, enhanced 5 point grounds, new crank sensor itself, new alternator (I was getting desperate), I mapped the entire electrical system, tested dozens of circuits........ Until one day cleaning up and sorting through a "spare item" box I found the pigtail and the light bulb went off. A day later the sucker fired right up. THAT is a facepalm x10...lol

                  I even tested the crank sensor wires to make sure there was no breaks in the wire. I swear I still have residual frustration.
                  Last edited by TGP37; 09-10-2011, 12:53 PM.
                  1996 Grand Prix | 3100v6 L82 | T04E-50 Turbo | Getrag 282 w/ EP LSD | SPEC-3 Clutch

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                  • #10
                    I feel your pain there, a break in the ICM to crank sensor wire caused me about a weeks worth of frustration recently.
                    I've really been taking my time with this one, I use to "throw" cars together when I was younger and got out of it what I put in... half-assed performance.
                    I'm not sure how many builds I have left in me so I decided to make this one count
                    sigpic
                    "It's your car. Do with it what you wish, but as you enter this unknown world you will need to invent the wheel all over again. For the adventurous and those that are backyard mechanics who have nothing but time you might like this. Most have plenty of frustrating moments and the process usually takes significantly longer then what anyone could imagine. The end result of this conversion is completely up to you." - Jon McCullough of BMCautos.com

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