knocking noise on shutdown

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  • ieatpeople
    E30 Modder
    • Mar 2008
    • 883
    #1

    knocking noise on shutdown

    not an e30, but just the same......

    i have an 88 528e (m20b27), 5sp manual, with about 175k miles on it. everytime i shut the car off it makes a knocking noise just as it comes to a stop. i had the car on a lift recently and had my buddy start and shut off the engine a couple times, and from underneath, it seems to be coming from the transmission. it sounds like rod knock, but what in the trans would make that noise?

    i'm pretty sure its the input shaft bearing, what do ya'll think?


    it only makes the noise on shutdown, never any other time. and if i have the clutch disengaged, the noise is not as loud, or doesn't occur at all.
    Originally posted by BillBrasky
    That's like Vlad challenging Chip Foose to a car painting contest.
    Originally posted by acolella76
    i'm pretty sure 'Phillis' is short for syphilis
    2007 CVPI, stock and slow
    1994 tercel, 5efhe swap, i/h/e
    1984 t-type, 5.3/th350 swap in progress

    My newest addition:
    Rebecca Arlene, born 4/19/2013
    Tags: None
    • jlevie
      R3V OG
      • Nov 2006
      • 13530
      #2
      The cause could be bad motor or transmission mounts or loose exhaust.
      The car makes it possible, but the driver makes it happen.
      Jim Levie, Huntsville, AL

        Comment

        • ieatpeople
          E30 Modder
          • Mar 2008
          • 883
          #3
          motor and tranny mounts are new, as is the exhaust, thats why it was on the lift. while i had it up, i decided to check the on the knocking sound, to see if it was coming from the oil pan (rod knock), or from the tranny case.


          driving to work this morning in stop and go traffic, i noticed a vibration coming through the shifter, and a whining noise that increased with rpm, but not speed. so its something on the front end of the transmission.

          i'm still thinking input shaft bearing.
          Originally posted by BillBrasky
          That's like Vlad challenging Chip Foose to a car painting contest.
          Originally posted by acolella76
          i'm pretty sure 'Phillis' is short for syphilis
          2007 CVPI, stock and slow
          1994 tercel, 5efhe swap, i/h/e
          1984 t-type, 5.3/th350 swap in progress

          My newest addition:
          Rebecca Arlene, born 4/19/2013

            Comment

            • StereoInstaller1
              GAS
              • Jul 2004
              • 22679
              #4
              I wish I had some useful input on this. I am starting to get a slight rattle on shutdown too. Hopefully you get some useful answers "up in here"

              Closing SOON!
              "LAST CHANCE FOR G.A.S." DEAL IS ON NOW

              Luke AT germanaudiospecialties DOT com or text 425-761-6450, or for quickest answers, call me at the shop 360-669-0398

              Thanks for 10 years of fun!

                Comment

                • StereoInstaller1
                  GAS
                  • Jul 2004
                  • 22679
                  #5
                  My "knocking noise" got WAY worse all of a sudden.

                  I jacked the damn thing up to find a broken cat heat shield...screwed that bitch back together and all is quiet now.

                  Luke

                  Closing SOON!
                  "LAST CHANCE FOR G.A.S." DEAL IS ON NOW

                  Luke AT germanaudiospecialties DOT com or text 425-761-6450, or for quickest answers, call me at the shop 360-669-0398

                  Thanks for 10 years of fun!

                    Comment

                    • rbartongrimley
                      Wrencher
                      • May 2008
                      • 286
                      #6
                      There is a TSB for e30's for that noise. It should be coming from the dual mass flywheel. They recommend that when you change you clutch that you convert to a single. When you turn off the car, try pressing your foot all the way down on the clutch, and say have it in first.


                      Do Work www.sbeuroclub.com

                        Comment

                        • ieatpeople
                          E30 Modder
                          • Mar 2008
                          • 883
                          #7
                          Originally posted by rbartongrimley
                          There is a TSB for e30's for that noise. It should be coming from the dual mass flywheel. They recommend that when you change you clutch that you convert to a single. When you turn off the car, try pressing your foot all the way down on the clutch, and say have it in first.

                          when i turn it off with the clutch down/in, it doesn't make the noise, but if i just turn it off, without pressing the clutch down, it rattles.

                          so this could be the flywheel? doesn't matter, the car is due for a clutch anyhow. i have a single mass flywheel laying here, do they use the same clutch?, or is there a specific clutch for each type?

                          if i upgrade the clutch, what brand do you guys recommend? (links and prices are great)
                          Originally posted by BillBrasky
                          That's like Vlad challenging Chip Foose to a car painting contest.
                          Originally posted by acolella76
                          i'm pretty sure 'Phillis' is short for syphilis
                          2007 CVPI, stock and slow
                          1994 tercel, 5efhe swap, i/h/e
                          1984 t-type, 5.3/th350 swap in progress

                          My newest addition:
                          Rebecca Arlene, born 4/19/2013

                            Comment

                            • nickpdx
                              Mod Crazy
                              • Oct 2008
                              • 679
                              #8
                              Originally posted by ieatpeople
                              when i turn it off with the clutch down/in, it doesn't make the noise, but if i just turn it off, without pressing the clutch down, it rattles.

                              so this could be the flywheel? doesn't matter, the car is due for a clutch anyhow. i have a single mass flywheel laying here, do they use the same clutch?, or is there a specific clutch for each type?

                              if i upgrade the clutch, what brand do you guys recommend? (links and prices are great)
                              OEM Sachs clutch. http://www.pelicanparts.com/BMW/cata...Tclutc_pg1.htm

                                Comment

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