Monday 23 January 2012

Clutch Delay Valve - The hidden enemy in your BMW

As the summer months came to an end I noticed the car juddered when pulling away. Going by previous experience I put this down to oil on the clutch, but after doing some digging I found that my car was fitted with a Clutch Delay Valve (CDV) which had partly failed. A very common ailment.

For those who are unaware, the CDV slows the clutch engagement by restricting the flow of clutch fluid, which helps make pulling away and gear changes smoother. This sounds great to most people but it makes the clutch feel numb and removes control from the driver, not to mention wearing out the clutch quicker.

Luckily I came across a great website which describes the modification and how it can be done at home for free (I opted to buy a new valve for £6 from BMW). In essence the modification removes the inside of the valve opening a bigger hole to allow the free flow of fluids.
http://www.billswebspace.com/BMWCDVMod.htm



The result, no more judder and I can actually feel the clutch now! I am once again a happy man.
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6 comments:

  1. Anonymous8 February 2012 at 14:31

    I have a judder at pull off in cold weather on my 320d E92 and will be trying the same if it is that simple!It is very annoying!!

    ReplyDelete
  2. matthew18 April 2012 at 22:58

    This car is stunning... i dont have one myself but this is interesting stuff..!! followed

    ReplyDelete
  3. Anonymous29 July 2012 at 15:35

    I solved the clutch judder by a remap and slightly upping the idle speed, as an addition I will do the clutch valve.

    ReplyDelete
  4. Anonymous31 May 2013 at 04:48

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  5. Anonymous17 July 2013 at 10:42

    Hi do you know the BMW part number for this CDV please??

    Thanks for the great blog!!

    ReplyDelete
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