Advice on CDV removal/replacement?

T

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Hi guys,

I'm looking to either remove or replace (with a modified unit) the CDV on my 2003 2.5l Z4, and was wondering if anyone could please advise me on the best/easiest way to do this?

Thanks in advance for any advice

Russ
 
Easiest way :
Jack one side of the car, go under it, take two 15mm spanners (or 16mm,can), before you start, clamp clutch cylinder hose to stop brake fluid from leaking. Then remove cdv valve, you don't need modified one, just remove old one and reconnect the pipe. It's 30min job, less if you have the access to car lift.

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What is the result?

I know it is supposed to improve the drive but how and what difference would you experience

Finally what is the impact on any warranty in place?

Thanks
 
Marius said:
Easiest way :
Jack one side of the car, go under it, take two 15mm spanners (or 16mm,can), before you start, clamp clutch cylinder hose to stop brake fluid from leaking. Then remove cdv valve, you don't need modified one, just remove old one and reconnect the pipe. It's 30min job, less if you have the access to car lift.

Sent from my LT18i using Tapatalk 4 Beta
Click to expand...

Would passenger side provide best access? Or is the CDV in the middle?
 
Spikey said:
What is the result?

I know it is supposed to improve the drive but how and what difference would you experience

Finally what is the impact on any warranty in place?

Thanks
Click to expand...

It stops the hick-ups in 1st and 2nd gear, so far, no one reported any issues after removing the CDV. As for warranty you best replace it by a modified one.
 
Its in the middle, but its to the drivers side of the gear box


Just to add to marius post, dont forget to bleed the clutch after as well, like you would with the brakes, the nipple is just above the cdv

Sent from my GT-I9300 using Tapatalk 2
 
Warranty impact: If you modify your existing CDV, and knock the restrictor out, you'll be fine. If you remove the whole unit, it might cause problems if you have to make warranty claim for clutch etc.

If you don't fancy doing the job yourself, it's 30mins labour at any decent garage/dealer.

On ///M cars, some owners say the difference isn't that noticeable. On all other models, it transforms 1st to 2nd shifts.

Removal video here

[youtube]PoB5ORUMdnE[/youtube]
 
Thanks Adamski, much clearer than most topics on the CDV on the forum! :thumbsup:
Too bad they didn't show how to bleed the system... where is the bleed nipple on this pic from the video?
I'll try to find a vid on the clutch bleeding for a Z4...

CDV.jpg
 
You cnat see it in that pic

I belive its further up

The nipple has a rubber cap on it

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If I understood correctly, after removing or replacing the CDV, there are 2 ways to bleed the system:

1) press the clutch pedal down with the bleed nipple unscrewed, close the bleed nipple and release the clutch, re-open, press pedal down, close bleed nipple again and so on. That would make the air in the system go downwards through the system. That would be a 2-man job and would probably require you to fill up the brake fluid reservoir (as both seem to be connected)?

2) This way seems a good way too:
[youtube]wdf--suwqw0[/youtube]

And this should be the bleed nipple, attached to the slave cilinder:
attachment.jpg
 
Thats the cylinder bleed nipple,

The clutxh bleed nipple is near the gear box near the cdv

Use method one, but use a one man bleed kit, only a couple of quid and eliminates the ned for two people

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