R50/R53 :: Hatch Talk (2002-2006) Cooper (R50) and Cooper S (R53) hatchback discussion.

'02 MCS Engine sound w/ video and sound!

  #1  
Old 07-10-2012, 12:44 PM
newzac
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'02 MCS Engine sound w/ video and sound!

Just started today. Makes the sound with the clutch in and out. When I rev and let off it makes a gear kind of noise. Is it the chain tensioner or possibly the S/C pulley? It is definitely from the passenger side. 56k miles.

video

http://www.youtube.com/watch?v=XHn16i4gbS4
"> http://www.youtube.com/watch?v=XHn16i4gbS4
" type="application/x-shockwave-flash" width="425" height="350">



Its the same exact video, no need to watch both
 

Last edited by newzac; 07-10-2012 at 01:22 PM.
  #2  
Old 07-10-2012, 01:37 PM
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Any overheating? If so it's the supercharger/water pump gears. It sounds like either the supercharger timing chain tensioner or possibly even the crank pulley. 1st thing i would check is the crank pulley since it's an easy visual check. Just look at it and see if there is any separation or cracks in the rubber. If it's not that then use a stethoscope or stick check the timing tensioner and supercharger. If it's the charger you'll need a new one or a rebuild on your current one. If it's the tensioner just swap it for a new one.

All 3 of those are pretty common problems.
 
  #3  
Old 07-10-2012, 01:46 PM
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Supercharger rattle.

Tensioner rattle

Crank pulley rattle
 
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Old 07-10-2012, 01:53 PM
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Sounds more like the second one. Also forgot to mention that it sounds like it coming from the upper rear area.

Thanks for quick replies guys.
 
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Old 07-10-2012, 02:09 PM
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I was thinking the same. Easy fix and the cheapest of the 3!
 
  #6  
Old 07-10-2012, 02:40 PM
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No overheating

Whilst driving:
- frequency increases when I lift throttle
- frequency also is mostly proprotional to engine speed
 
  #7  
Old 07-10-2012, 08:04 PM
ERIK06MCS
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My initial thought was chain rattle. Sounds almost identical to an Audi after an oil change. Takes a lot of Audi's a few seconds of chain slap after an oil change before the tensioner pressurizes again.

Definitely want to get that fixed ASAP.

Read here about the dangers of continued use and even changing the tensioner but driving merely 25 more miles to get an oil change afterward:
https://www.northamericanmotoring.co...e-problem.html

Unlucky owner had chain rattle, put in new tensioner and was driving it fixed to go get an oil filter and motor lost oil pressure on the drive.. Only 25 mile drive too! The longer you drive with that sound the more damage will occur to the chain rails which are plastic. That plastic will break apart and drop down to the oil in the oil pan. Sooner or later the pieces will get sucked up into the oil pump and clog the mesh filter screen on the oil pump, starving the engine of oil.


May be worth further diagnosis with a stethoscope like Clay mentioned.. If you don't have a stethoscope, putting your ear up to the handle end of a long screwdriver that where the flat blade is pressed against various components listening for the loudest and most clarity point. Check the supercharger, timing case cover, valve cover, etc until you feel confident about the pinpoint of the noise to determine if it is indeed the chain tensioner.
 
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Old 07-11-2012, 07:43 PM
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Also, if you or anyone else ever wants an easy way to rule out the supercharger, remove the serpentine belt and start up the engine. If the noise is still there then it is NOT your supercharger as it only spins when the belt is turning.

Also, harmonic damper/crank pulley whatever you want to call it will rattle if the rubber cracks/breaks. You may notice excessive wobble of the balancer with the engine running. By removing the belt you can grab the balancer (engine OFF obviously) and see if you can wiggle it for play indicating broken rubber.
 
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Old 07-13-2012, 06:47 PM
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Not the chain tensioner. Ball sacks.

Oh yeah. When I lift the throttle the sound frequency increases then slows down.
 
  #10  
Old 07-13-2012, 09:19 PM
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Not sure if they make noise when they go out maybe someone can give more insight, but, i wonder if the timing chain guides have gone out? Could even be a bad idler pulley.

Have you ruled out the supercharger (diagnose idle with same method by removing the belt) and crank pulley/harmonic balancer using erik's method?

Edit: idler pulleys seem to have more of a whirling noise instead of ckicking when they go out. If you have a harbor freight near by i would invest $4 into an auto stethoscope and start listening to every moving part in the engine bay.
 

Last edited by clay44; 07-13-2012 at 09:27 PM.
  #11  
Old 07-14-2012, 09:25 AM
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Rod knock probably. Pull the belt and fire it up just to see if it's any accessory.

Jeremy
 
  #12  
Old 07-14-2012, 10:30 AM
newzac
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Not a rod knock. I know that sound. Its almost a gear or chain lash sound. I ruled out the S/C. Both sides are full of clean oil.

Is there anyway easier way to remove the belt then disassembling half the car?
 
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Old 07-14-2012, 11:13 AM
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Remove belly pan, untension tensioner and pull belt off supercharger pulley then remove from below.

Jeremy
 
  #14  
Old 07-14-2012, 11:21 AM
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Easy way to remove tension from tensioner? I don't have access to the tool.
 
  #15  
Old 07-14-2012, 11:47 AM
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Here's how I used to do it before making a tool/having OEM tool.

https://www.northamericanmotoring.co...belt-swap.html

Jeremy
 
  #16  
Old 08-17-2012, 04:01 PM
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that sounds exactly what I've been going through... it was the supercharger.. Had to have it rebuilt.
 
  #17  
Old 08-17-2012, 04:39 PM
newzac
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Nope. The s/c was fine. It turned out I bought a car that was in an accident and ran wothout oil. So my problem was metal particles in the engine.
 
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Old 08-18-2012, 07:33 PM
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Good lord. How did you come to this conclusion?

Is it still running and if so have you dropped the pan and cleaned off the oil pump inlet screen?
 
  #19  
Old 08-18-2012, 09:21 PM
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It started to lose power bad so I sent it to Detroit Tuned. They initially thought it was an exhaust valve until they pulled the filter and found it full of metal
 
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