Transmission rattle at idle with clutch out

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  • bighitbiker3
    Member
    • Jun 2013
    • 84

    #1

    Transmission rattle at idle with clutch out

    So I've done quite a bit of searching and am getting a lot of mixed opinions. I recently have been noticing a rattle at idle, but only sometimes. When I rev up to about 1.3k the noise goes away. If I let it idle in neutral and the clutch is pushed in, the noise goes away. If the car is cold it doesn't make noise. It only rattles with the car warm and the clutch pedal out.

    Is this a throw out bearing? Or is it a bad input shaft bearing? Getrag rattle?
  • FLG
    No R3VLimiter
    • Sep 2011
    • 3165

    #2
    Sounds like typical getrag rattle. Do you have a lightned flywheel? Generally that makes things worse.

    The hotter it is, typically ive noticed the louder it is. Some people ask me if my engine is knocking, i push in the clutch and they look at me with a confused face.
    -Build http://www.r3vlimited.com/board/showthread.php?t=295277

    Comment

    • wilholl
      E30 Addict
      • May 2012
      • 518

      #3
      ^^This^^
      1988 325 non-letter Seta "Bronzit"
      1991 325ic "Laguna Green" (Sold)
      1993 325i "Laguna Green/Silver" (Sold)
      1998 528i "Artic Silver" m-sport(totalled by drunk driver)
      2000 528i Titansilber/gray m-sport
      2000 528i Titansilber/black m-sport(sold)
      2001 525i Anthracite m-sport(sold)
      2013 750i Black/Black m-sport "Beast"

      Comment

      • ascendotuum
        Member
        • Jul 2013
        • 80

        #4
        My car has this same exact problem. If I let the clutch out ever-so-slowly it won't do it (sometimes). I just bought this E30. It has M52b28 swap with ZF trans. The PO says this is from the dual-mass flywheel and is normal.

        It makes the car sound like a diesel. But this is normal?

        Comment

        • Ether-D
          R3VLimited
          • Sep 2011
          • 2838

          #5
          I dont think any rattles are normal (lessin' it is a diesel). My old Getrag did this too. My new (junkyard) one does not.
          Originally posted by Andy.B
          Whenever I am about to make a particularly questionable decision regarding a worryingly cheap diy solution, I just ask myself, "What would Ether-D do?"
          1987 325iS m30b34 Muscle car (Engine electrical phase)
          ~~~~~~~~~~
          I was born on 3/25…
          ~~~~~~~~~~

          Comment

          • nando
            Moderator
            • Nov 2003
            • 34827

            #6
            Originally posted by Ether-D
            I dont think any rattles are normal (lessin' it is a diesel). My old Getrag did this too. My new (junkyard) one does not.
            it's normal for a getrag. it'll rattle and run like that for 300,000 miles.
            Build thread

            Bimmerlabs

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            • bighitbiker3
              Member
              • Jun 2013
              • 84

              #7
              Alright sounds like Getrag rattle then...guess i'll have to get used to it

              Comment

              • maclogos
                Advanced Member
                • Jun 2013
                • 120

                #8
                I also have this rattle noise with my G260 and the noise continues even with the clutch in or out. Im starting to think bent flywheel possibly? Or even loose bolts in the trans somewhere.

                Comment

                • jlevie
                  R3V OG
                  • Nov 2006
                  • 13530

                  #9
                  A rattle in neutral with the clutch engaged that disappears when the clutch is disengaged will be from wear of the transmission input shaft bearings. A lightweight flywheel will make the noise worse. Fortunately, unless really loud it isn't something to be overly concerned about. The only fix is a replacement transmission or a transmission rebuild.

                  But in this latest case a rattle with or without the clutch engaged is more serious. It could be from the transmission, flywheel/clutch, or the engine. Further diagnostics will be required to determine the cause.
                  The car makes it possible, but the driver makes it happen.
                  Jim Levie, Huntsville, AL

                  Comment

                  • maclogos
                    Advanced Member
                    • Jun 2013
                    • 120

                    #10
                    Yes i agree. I plan to pull the trans eventually to make sure that nothing is loose in there.

                    Comment

                    • maclogos
                      Advanced Member
                      • Jun 2013
                      • 120

                      #11
                      I do know that the PO of my car was the one to sand down/grind off some of the flywheel for the M50 swap. Im thinking the quality of his work might be suspect.

                      Comment

                      • ascendotuum
                        Member
                        • Jul 2013
                        • 80

                        #12
                        I was told by a transmission specialist that my noise was the dual-mass flywheel. He recommended swapping it for a regular flywheel.

                        Sent from my HTC One using Tapatalk 4

                        Comment

                        • nando
                          Moderator
                          • Nov 2003
                          • 34827

                          #13
                          if you have an M20B25 you don't have a dual mass flywheel.
                          Build thread

                          Bimmerlabs

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                          • ascendotuum
                            Member
                            • Jul 2013
                            • 80

                            #14
                            I have a m52b28 swap. Those have one?

                            Sent from my HTC One using Tapatalk 4

                            Comment

                            • nando
                              Moderator
                              • Nov 2003
                              • 34827

                              #15
                              it depends on what clutch you used.

                              also, a dual mass flywheel won't cause a rattle, unless possibly the flywheel is worn out - but you could just replace the flywheel. it doesn't have to be single mass.
                              Build thread

                              Bimmerlabs

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