How to modify your CDV (Clutch Delay Valve)

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Chappio
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Re: How to modify your CDV (Clutch Delay Valve)

Post by Chappio » Mon Sep 17, 2012 7:43 pm

Does anyone know the part number. I have searched realoem and bmwmini spares, and all I have come up with is 6770937 and a price of £61. Even been to the dealer but they couldn't find anything. I am right in thinking it is called a lock valve?

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Re: How to modify your CDV (Clutch Delay Valve)

Post by BettyBmw03 » Thu Sep 20, 2012 6:13 pm

It is called an unlock valve, and apparently the price has went up. I check bavarian auto supoort and their price is now 87usd and it previously was only 34 usd.....not worth it for that amount.

However, the same thing can be accomplish by simply connecting the two lines together and just simply taking out the cdv....

Good luck

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Re: How to modify your CDV (Clutch Delay Valve)

Post by gerryfrost » Wed Sep 26, 2012 6:59 pm

Hi there
I have had my 3.0si for 2 weeks now and lovin it to bits! Done led interior light mods, checked DISA valve, general clean up of engine bay and checking every fluid, nuts and bolts.... stopped some of the interior rattles (only some!) reset throttle (big improvement to driving and smoothness....
Now I come across the cdv valve. I do HATE the way it is 'jumpy' between 1st and 2nd and I cannot get a smooth gearchange, so this looks like the kiddy to change.
I am competent to take off the valve but can someone explain, in basic terms, how to 'bleed the clutch' afterwards.
Thanks.

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Re: How to modify your CDV (Clutch Delay Valve)

Post by BluZiff » Sun Nov 25, 2012 5:24 pm

I still havent got round to having this done, if im paying someone to do it what is involved and what should I expect to pay?

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Re: How to modify your CDV (Clutch Delay Valve)

Post by sam1832 » Sun Nov 25, 2012 6:28 pm

BluZiff wrote:I still havent got round to having this done, if im paying someone to do it what is involved and what should I expect to pay?

Ed
If your just having it removed

Have it done with a brake fluid change then I wouldn't of thought it wouldnt anymore than £70 for both

As it's a two minute job and if you changing fluid anyway you have to bleed it then

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Re: How to modify your CDV (Clutch Delay Valve)

Post by BluZiff » Sun Nov 25, 2012 8:23 pm

Thankyou! I have emailed a specialist in Camberley to see what they come up with.
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Re: How to modify your CDV (Clutch Delay Valve)

Post by Bad_Pritt » Thu Jan 31, 2013 10:07 pm

OK, just read through the whole post and still don't get it :cry:

Well, as I understand:

- it is located under de passenger's side
- It looks like a bolt with a groove in it
- you can remove it completely and just connect the hoses

The part that I don't understand (and never done before) is the "bleeding" of the system. That's really the part that is putting me off though I hate the wobbly gear changes between 1st and 2nd gear... Is it really necessary to bleed the system? Or can I just put clampts on the hoses while unbolting the CDV and reconnect?

I'd like to do it myself but don't want to do it wrong either...
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Re: How to modify your CDV (Clutch Delay Valve)

Post by bcworkz » Fri Feb 01, 2013 5:14 pm

It's impossible to do this procedure without introducing some air into the system, though clamping certainly minimises it, which makes bleeding a shorter process. Air in the system compromises clutch feel. Since the whole point of the CDV removal is clutch feel, I'd say it's pointless if you don't subsequently bleed the system.
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Re: How to modify your CDV (Clutch Delay Valve)

Post by Bad_Pritt » Fri Feb 01, 2013 9:51 pm

OK, but how do you bleed the system, I haven't got the slightest idea to be honest...
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Re: How to modify your CDV (Clutch Delay Valve)

Post by sam1832 » Sun Feb 03, 2013 11:48 pm

Same as bleeding the brakes

There is a bleed nipple, you turn it half a turn to open it, push the clutch pedal to the floor, close it while holding the pedal on the floor
Let the pedal up

Repeat a few times

Obviously you need two people lol

The nipple is near the cdv

You will understand when you see it

You must get the air out otherwise it wont work

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Re: How to modify your CDV (Clutch Delay Valve)

Post by Bad_Pritt » Mon Feb 04, 2013 9:44 am

And where exactly do you add clutch fluid, and more importantly: how much?
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Re: How to modify your CDV (Clutch Delay Valve)

Post by sam1832 » Mon Feb 04, 2013 11:06 am

Bad_Pritt wrote:And where exactly do you add clutch fluid, and more importantly: how much?
Same reservoir as the brake fluid

Top left corner of the engine bay

I wouldnt of thought you would need to top it up from just changing the cdv


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Re: How to modify your CDV (Clutch Delay Valve)

Post by Bad_Pritt » Mon Feb 04, 2013 11:32 am

That's exactly what wasn't clear to me, thanks! Now I'm more confident doing it myself :-)

Just one stupid question though... I suppose you first connect the tubes again (after removing the CDV) and only then bleed via the nipple until all air is gone?
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Re: How to modify your CDV (Clutch Delay Valve)

Post by sam1832 » Mon Feb 04, 2013 12:25 pm

Correct

Get a one man bleee kit

Its a bit of tube with a one way valve you can then do it on your own

You look in the fluid thats in the tube until all the air bubbles have gone

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Re: How to modify your CDV (Clutch Delay Valve)

Post by Bad_Pritt » Mon Feb 04, 2013 2:25 pm

I'll ask my wife to assist me :D
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