2nd Gen R56 Cooper S Most liked posts in thread: Engine slight overlapping knocking sound coming from cylinder #4

  1. Motoring Magic

    Motoring Magic New Member
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    Dec 13, 2009
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    Motoring Magic Owner, Ventura County's ONLY MINI s
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    #2 Motoring Magic, May 29, 2014
    First-check your oil! if it is full, and the ses light is not on, the valvetroic is working correctly-if the cam timing is out of range by 2 degrees it will turn on that yellow light-if you are low on oil, it could make noise on decel
     
  2. Systemlord

    Systemlord New Member

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    #3 Systemlord, May 30, 2014
    I check my oil religiously every three gas tanks, my MCS doesn't burn through much oil like most N14's do, more like an N18. I checked my oil anyway right after the noise went away, down to the first mark on the top of the Craven dipstick. My valves weren't that bad at 47k when I had them walnut blasted. Are my lifters hydraulic and could that be my issue? Also can the lifters be replaced without removing the cams? It doesn't happen when the engine is cold, it happens after prolonged freeway driving and as soon as I come to an idle it can be heard, but doesn't happen often enough. Turning off the engine seems to clear it right up, weird!

    I don't understand how turning off the engine would make much difference on a mechanical moving part. My only guess now is a sticky lifter that doesn't lift up all the way, I mean if a lifter is getting struck after the cam lobe swipes it that might explain the lobe hitting it when it's stuck compressed creating that overlapping knocking sound. If this is something that requires removal of the cams you will be the first to know about it.

    Compression is, it builds up quick in all four cylinders.

    #1 155
    #2 153
    #3 154
    #4 156
     
  3. Motoring Magic

    Motoring Magic New Member
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    #4 Motoring Magic, May 30, 2014
    I have NEVER seen a hydraulic lifter issue in an r56 so forget that. It COULD be you might be overly sensitive to normal sounds in your car-I have an 08 turbo N14 car and I pretty much ignore most sounds within it knowing the oil and coolant are full! come by the shop sometime and we can compare cars, you can drive mine and see how it compares to yours
     
  4. Systemlord

    Systemlord New Member

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    #5 Systemlord, May 30, 2014
    Last edited: May 30, 2014
    I have own the Mini for a little over a year and never heard that sound before, today it was quieter than usual, but the other times it would turn heads if anyone was near the Mini. I expect as time goes on it will become more frequent , thank God I have 5 years left on my warranty! :)

    This month (June) I'm planning on doing some long distance driving with the BG 44K in my tank to further clean my carbon buildup in the combustion chambers, I will drop by then to get a look at your shop for sure.