1st Gen R53 Cooper S Help: Passenger side engine noise under hard acceleration

Discussion in '1st Generation: 2002–06 R50, R53 & 2004–08 R52' started by yodejt02, Jun 4, 2012.

  1. yodejt02

    yodejt02 Club Coordinator

    Mar 31, 2011
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    OK so here is what I know....
    A few weeks ago I had the opportunity to drive my MINI on the Indy 500 track, and in doing so noticed an engine noise coming from the passenger side that seems to most present around 3000 RPM under load.

    I have since recreated this noise at home driving next to buildings or along road barriers.

    The steps I have taken
    1. checked the tensioner. The shock bushings looked good, neither were cracked and the rubber was still good condition. Tensioner seemed to be doing its job without any complaints
    2. I have listened to the car and start up and at idle numerous times since and have not heard anything out of the ordinary, and have revd the engine, but nothing to indicate the supercharger is at fault. Most of what I have read and searched seems to point to the supercharger making noise even at idle. I even bought a stethoscope from the autoparts store to be able to listen more carefully, thinking that my trusty long screwdriver might be feeding me false information.

    So this is where I am......
    I think it might a timing tensioner, or still could be the supercharger. I am even planning on changing the belt because threw my searching I had read that it might be the issue. I guess I am looking for some other educated guesses, as I am running out. I always try to start with the least complex and cheapest solution first, and have yet to solve this mystery

    Also, I forgot to mention I do have the typical throwout bearing noise that graces most our cars.

    Thanks for any help
    John
     
  2. quikmni

    quikmni Moderator

    Jun 6, 2009
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    How many miles on your car? What kind of noise?
    Do you notice any performance difference when noise is made?
    Can you recreate the noise when parked in neutral by accelerating engine?

    Maybe belt slipping.
    Maybe crank pulley starting to fail.
     
  3. yodejt02

    yodejt02 Club Coordinator

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    No performance difference, i can feel, and I can not recreate the noise when parked in neutral and accelerating the engine. This past weekend I took the pass. wheel off and took the fender liner out to look at the the crank pulley and reved the engine and there was no noise. This is why I am confused, thought too it was the crank pulley giving way.

    Milage on the the Cooper is 71, 000 so I am sure there is going to start being a long list of things that need replacing in the coming miles.

    Tonight I think I will take the belt off again and see if there is any play in the crank pulley. I guess there is really no way to check to see if that is bad visually is there?
     
  4. quikmni

    quikmni Moderator

    Jun 6, 2009
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    Can you describe the noise?
    Any burning rubber smell?
     
  5. yodejt02

    yodejt02 Club Coordinator

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    no burning rubber smell. And as far as describing the noise well it does get faster as the revs increase, but for an actual sound.......I dont know, at first I thought it was an exhaust leek somewhere, if that helps describe the sound. I am afraid one mans ting is anothers clang. Describing sounds is not that reliable. But to humor everyone I will try.....
    It sort of sounds like cardboard on a bike wheel....but tin-ier......I guess maybe I should post a video or a sound clip


    I am trying to diagnose this as soon as possible I have an Autocross event this next week and would like to be able to go.
     
  6. yodejt02

    yodejt02 Club Coordinator

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    By the way thanks for the reply's. Its nice to know there is at least one person trying to help me out:)
     
  7. yodejt02

    yodejt02 Club Coordinator

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    just relieved the tension on the belt and tried to "wiggle" the crank pulley, it does not have any lateral movement to it, suggesting the rubber is failing. I dont even know if that is an excitable test to do on a crank pulley, seemed logical. If the rubber was failing there should be some sort of movement hence the noise it could be generating.,......
     
  8. M^Cubed

    M^Cubed Member

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    Hub or CV noise possibly?
     
  9. Mr. Jim

    Mr. Jim Mudshark
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    Could it be related to possibly a bad engine mount and exhaust is hitting somewhere?
     
  10. yodejt02

    yodejt02 Club Coordinator

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    My other thought was a bad motor mount i believe they are original to the car. I don't have any bracing under the car so I don't think it could be the exhaust hitting anything. And as for the cv's, the boots are still looking really good, are they known to fail while still sealed?

    What is the best way to check for a bad motor mount?
    And what is an acceptable way of checking the crank pulley?

    Thanks for all the thoughts and ideas.
     
  11. Mr. Jim

    Mr. Jim Mudshark
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    Top mount with a small pry bar between bracket and mount, same with the bottom.
     
  12. BlimeyCabrio

    BlimeyCabrio Oscar Goldman of MINIs
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    #12 BlimeyCabrio, Jun 4, 2012
    Last edited: Jun 15, 2012
    Your check of the crank pulley is pretty reasonable. Unfortunately, they don't show a lot of symptoms before failing completely. But if it had failed, you would be able to turn it by hand with the belt off/loose. And it would throw the belt... or you'd be in limp mode.

    Another possibility is idler pulley - they get loose and make some noise after a time. Easy to replace, can sometimes be tighten up when removed, and reinstalled.

    Engine mount will have leaked black fluid out, staining the rail on which it's mounted, if it has failed. You can also watch the engine while someone shifts between 1st and reverse and releases clutch - engine will move a good amount fore and aft.
     
  13. yodejt02

    yodejt02 Club Coordinator

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    Motor mount failure is starting to make the most sense. I am going to change the belt, and since the part is cheap going to change the timing tensioner as well. I will look at the motor mounts and if there is a lot of play change those out as well.

    I planned on servicing the supercharger this fall, since according to most of the posts my current mileage is when it should be looked at.

    I really wish I was closer to a more active region of DIYers so I could glean some MINI knowledge first hand, but I guess thats why we've got this forum.

    Thanks everybody for the ideas, hopefully I can get this thing worked out. I may end up having to drive an two hours north to Detroit Tuned and have them listen to it. ROAD TRIP!!!!
     
  14. yellowbritishrocket

    yellowbritishrocket Well-Known Member

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    is the noise high pitched that comes in over the supercharger?if so it could be the AC compressor...when the clutch goes and the bearings in it start to fail it does make a high pitched whine
     
  15. SeanKidd

    SeanKidd New Member

    Sep 8, 2010
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    Cardboard box

    I just started noticing the same sound on my 03 MCS, I got out to see if I had a branch or cardboard box stuck under the car, have yet to diagnose. Please keep posting. My noise is most noticeable during acceleration in fourth or fifth, and you should downshift but don't.
     
  16. SeanKidd

    SeanKidd New Member

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    My noise turned out to be my JCW air filter gasping for breath, just replaced it with Amsoil high flow replacement from Chad at Detroit Tuned and no more gasp.
     
  17. BlimeyCabrio

    BlimeyCabrio Oscar Goldman of MINIs
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    JCW Amsoil Nanofilter FTW :Thumbsup:
     
  18. Crashton

    Crashton Club Coordinator

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    Glad it was an easy fix. How long since the air filter had last been serviced?
     

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