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What do failing rod bearings sound like?

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    What do failing rod bearings sound like?

    If you have rod bearing(s) that are bad or on the way out is there any particular sounds they typically make? I know if you spun one you would likely hear a terrible noise.
    2004 Silbergrau Metallic 6MT
    Karbonius/OEM Snorkel/Flap/HTE Tuned
    Ssv1/Catted Sec. 1/SS 2.5" Sec. 2/SCZA

    OE CSL Bootlid/AS SSK/BC Coils/4.10 Gears/ Sportline 8S Wheels/Cobra Nogaros
    RACP Plates/Vincebar/CMP/Turner RTAB/Beisan

    2006 M6 Black Saphire SMG
    Instagram

    #2
    Once they’ve started making noise, you’ve almost certainly damaged your crank— $$$. You should not wait for a noise to replace them or you’ll be very sad you did.

    But, sounds like knocking.

    2005 IR/IR M3 Coupe
    2012 LMB/Black 128i
    2008 Black/Black M5 Sedan

    Comment


      #3
      OK, I've got a new noise, kind of a "whirring" or slight rattle sound sometimes at about 2.5k and can't identify it. Definitely not a knocking sound.
      Rod bearings are on my list with 64k on the car, Beisan first this summer than maybe rod bearings this fall/Winter.
      2004 Silbergrau Metallic 6MT
      Karbonius/OEM Snorkel/Flap/HTE Tuned
      Ssv1/Catted Sec. 1/SS 2.5" Sec. 2/SCZA

      OE CSL Bootlid/AS SSK/BC Coils/4.10 Gears/ Sportline 8S Wheels/Cobra Nogaros
      RACP Plates/Vincebar/CMP/Turner RTAB/Beisan

      2006 M6 Black Saphire SMG
      Instagram

      Comment


        #4
        In some instances they sound like a hole in the block.

        Comment


          #5
          So whats up with the rod bearing recall cars 01-mid 03? What was the issue?
          At what point would one want to preventatively address the rod bearings? I know that may be a difficult question to answer as no two engines are treated the same.
          Last edited by Cubieman; 05-17-2020, 12:08 PM.
          2004 Silbergrau Metallic 6MT
          Karbonius/OEM Snorkel/Flap/HTE Tuned
          Ssv1/Catted Sec. 1/SS 2.5" Sec. 2/SCZA

          OE CSL Bootlid/AS SSK/BC Coils/4.10 Gears/ Sportline 8S Wheels/Cobra Nogaros
          RACP Plates/Vincebar/CMP/Turner RTAB/Beisan

          2006 M6 Black Saphire SMG
          Instagram

          Comment


            #6
            Originally posted by Cubieman View Post
            OK, I've got a new noise, kind of a "whirring" or slight rattle sound sometimes at about 2.5k and can't identify it. Definitely not a knocking sound.
            Rod bearings are on my list with 64k on the car, Beisan first this summer than maybe rod bearings this fall/Winter.
            The whirring noise I heard at lower RPMs turned out to be five intake cam bolts cut in half with the sixth and remaining one cut halfway thru. I never really had the marbles in a can sound some described but it was noisy in the RPM range you're hearing the noise - but not excessively noisy. That was at 47k miles and over three years and 13k miles ago. I did the full Beisan treatment and no issues since.

            Comment


              #7
              Originally posted by Cubieman View Post
              So whats up with the rod bearing recall cars? Mine never had a recall on the rods (06/2004), from what I understand the rod bearing recall was only on earlier cars and something was done to address the problem. At what point would one want to preventatively address the rod bearings? I know that may be a difficult question to answer as no two engines are treated the same.
              I believe your problem might be more towards a vanos. I got mine done around 44k and noise went away (too much play on pump). I just did my bearings at 60k and two were slightly showing copper. Mine is an 06. I think Bmw “service action” was just to buy time.
              06 ZCP SMG | HTE CSL MAP QuaranTune | SL CSL Airbox | Eventuri Scoop | DMG Strut Bar | RE El Diablo | CPI Euro200R | AP Headers | Porsche BBK | ST XTA | TMS 3-Pulleys/F-Sway/Mono FCAB | AKG Trans/diff/Subframe/RTAB | SPL RCA | SGT SCZA Trunk | ACL | Beisan | Redish | AFD E85 |

              Budget CSL MAP Conversion

              Comment


                #8
                Well I'll be doing the Vanos within the next month or so and maybe that will address the noise. I edited my previous post as I read a blurb about the recall cars. The noise isn't loud, and doesn't sound particularly "bad", just a new engine noise that has developed recently.
                2004 Silbergrau Metallic 6MT
                Karbonius/OEM Snorkel/Flap/HTE Tuned
                Ssv1/Catted Sec. 1/SS 2.5" Sec. 2/SCZA

                OE CSL Bootlid/AS SSK/BC Coils/4.10 Gears/ Sportline 8S Wheels/Cobra Nogaros
                RACP Plates/Vincebar/CMP/Turner RTAB/Beisan

                2006 M6 Black Saphire SMG
                Instagram

                Comment


                  #9
                  Originally posted by Cubieman View Post
                  Well I'll be doing the Vanos within the next month or so and maybe that will address the noise. I edited my previous post as I read a blurb about the recall cars. The noise isn't loud, and doesn't sound particularly "bad", just a new engine noise that has developed recently.
                  Only takes a couple hours to put eyes on that stuff if you're hearing something that ain't right. Good excuse to adjust your valves while you're at it.

                  Comment


                    #10
                    It sounds like money flying out of your wallet....
                    😆 🤪

                    Comment


                      #11
                      Yea, I just bought all the BMW vanos stuff minus the valve cover gasket and associated plug gaskets as I already had them from recently buying a valve adjustment kit + a nice micrometer. That was $330, now I have all the Beisan stuff + core charges to buy. Today I also had to buy a new Motronic DME for my 3.2 911 with a tune ($795), oh boy I don't make enough to mess with these car, unless I do ALL the work on my own and even then its tight.

                      Oh yeah I just finished installing a CSL Intake with new DME and tune. Also ordered the parts for c pillar window trim, misc. flap wiring. I need my Turner airbox to come in ASAP so I can sell it and get some $ back into my account.

                      And after all that the rod bearings are still in question potentially. I should have done the preventative stuff before my mods. Although after doing the mods it
                      made me more interested on working on the car and learning more about what may go wrong and what to address before it goes wrong.

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                      Last edited by Cubieman; 05-18-2020, 11:00 PM.
                      2004 Silbergrau Metallic 6MT
                      Karbonius/OEM Snorkel/Flap/HTE Tuned
                      Ssv1/Catted Sec. 1/SS 2.5" Sec. 2/SCZA

                      OE CSL Bootlid/AS SSK/BC Coils/4.10 Gears/ Sportline 8S Wheels/Cobra Nogaros
                      RACP Plates/Vincebar/CMP/Turner RTAB/Beisan

                      2006 M6 Black Saphire SMG
                      Instagram

                      Comment


                        #12
                        Speaking from experience who just got them done, there was 0 difference between the bearings are good and the are on the way out. In the span of about 6,000 miles (my annual mileage) oil change, I went from all good to particles in the oil and strongly recommended to get them done. There was no sounds or performance changes. An oil analysis is your best bet and as you would imagine, if there are metal specs, flakes, etc. in the oil it's most likely the issue.

                        Originally posted by Cubieman View Post
                        If you have rod bearing(s) that are bad or on the way out is there any particular sounds they typically make? I know if you spun one you would likely hear a terrible noise.

                        Comment


                          #13
                          It sounds like WUMP, WUMP, WUMP

                          Comment


                            #14
                            I have an oil sample I took (midstream etc.) but its about a month old now, just been sitting at room temp. Is there any real issue with letting a sample sit before sending it in for analysis?
                            2004 Silbergrau Metallic 6MT
                            Karbonius/OEM Snorkel/Flap/HTE Tuned
                            Ssv1/Catted Sec. 1/SS 2.5" Sec. 2/SCZA

                            OE CSL Bootlid/AS SSK/BC Coils/4.10 Gears/ Sportline 8S Wheels/Cobra Nogaros
                            RACP Plates/Vincebar/CMP/Turner RTAB/Beisan

                            2006 M6 Black Saphire SMG
                            Instagram

                            Comment


                              #15
                              Originally posted by Cubieman View Post
                              I have an oil sample I took (midstream etc.) but its about a month old now, just been sitting at room temp. Is there any real issue with letting a sample sit before sending it in for analysis?
                              I asked blackstone about this once and they said it's fine, but it's worth making a note of it on the form that you send in with it.

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