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BMW 3-Series (E90 E92) Forum > E90 / E92 / E93 3-series Technical Forums > DIY Guides > DIY - E92 CDV (Clutch Delay Valve) Removal



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  DIY - E92 CDV (Clutch Delay Valve) Removal
EvanL
09-13-2006
Hey, just removed the CDV from my 335i today. Very straightforward and much simpler than the CDV removal from my E46 M3. Steps are as follows:

1. Jack the front end up and put it on JACK STANDS. Do not get under a car that is supported by a jack only.

2. Remove the...
  #22  
By longtran on 09-14-2006, 03:29 PM
damn..can you do mine???
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  #23  
By EvanL on 09-14-2006, 06:49 PM
Quote:
Originally Posted by longtran
damn..can you do mine???
If you ever happen to be in central Missouri, let me know!

Seriously, though, it's pretty easy. If you have jack stands and a good jack, it should only take you 20-30 minutes to perform. Oh, and be sure to have a friend there to help you bleed the clutch.

-Evan
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  #24  
By EvanL on 09-14-2006, 09:13 PM
Quote:
Originally Posted by petesamprs
I believe the CDV actually protects the transmission at the expense of the clutch, by slowing the linkup between the engine and tranny. So it's more to protect noobs from destroying the rest of the tranny by resulting in slower clutch linkage (more friction wear) if you try to drop the clutch at 6k RPM.
The purpose of the CDV is to prevent shock on the driveline from someone dropping the clutch too quickly. If you'll notice, BMW runs significantly smaller (and therefore less rotational inertia) driveshafts than almost all other car manufacturers. These driveshafts can break if they're abused all the time by a moron. This is also the purpose of the guibo (or flexdisc) that is installed between the transmission and the driveline. Lessen the driveline shock.

-Evan
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  #25  
By 18LLC on 09-26-2006, 03:50 PM
where can i add the clutch fluid? and how come i can't bleed the air out? i have been tried 30 minutes already, still feels nothing. helppppppppp!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!11
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  #26  
By EvanL on 09-26-2006, 04:10 PM
Quote:
Originally Posted by 18LLC
where can i add the clutch fluid? and how come i can't bleed the air out? i have been tried 30 minutes already, still feels nothing. helppppppppp!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!11
The clutch circuit uses the same fluid as the brake circuit, so just add fluid to the brake fluid reservior.

To bleed the clutch, first pump the clutch pedal a few times to work the air through the system. Then, with a friend in the driver's seat, have them start with the clutch pedal fully extended, and open the bleed valve (circled below in red). Be sure to close the bleed valve before he reaches the floor of the clutch travel, and CLOSE THE BLEED VALVE before he pulls the clutch pedal back up. Note that they probably will have to pull it back up by hand.

Repeat this process a few times, and you'll be good. Oh, and the spot where the CDV originally was is pointed to by the green arrow.

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  #27  
By EvanL on 09-26-2006, 04:11 PM
Also note that the bleed valve will have a rubber cap over it that is not shownin the photo.

-Evan
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  #28  
By Socom on 09-26-2006, 04:12 PM
Quote:
Originally Posted by BeeEmDubU
so what are the downsides then?
Possible problem with warranty claim.
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  #29  
By tiga901 on 09-26-2006, 05:45 PM
Quote:
Originally Posted by Neurorad
Has anybody had any mechanical problems after modding/replacing the CDV?

The Zeckhausen web page stated the e39 M5 didn't come with this CDV. Why does BMW put this in newer M3 and M5 cars?

I ahve mine for 9 months now and has not have any clutch related problem. If you are a noob using an MT, do not do this mod!!!!
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  #30  
By 18LLC on 09-26-2006, 06:35 PM
sh*t, i fully follow the instruction, still not working for me. i have 2 cars in the same shop at the same time now. fu*k. no fun.
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  #31  
By 18LLC on 09-26-2006, 07:46 PM
finally, my car got fix. will pick up half hour later.
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  #32  
By 18LLC on 09-26-2006, 09:06 PM
WOW, what can i said?! amazing. so smooth. thx for the help, man btw, this part, looks different in my car. maybe e90 and e92 is different? or maybe is because mine is xi? i didn't take pic of mine...
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Last edited by 18LLC; 09-27-2006 at 11:37 AM.
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  #33  
By EvanL on 09-27-2006, 04:44 PM
Quote:
Originally Posted by 18LLC
WOW, what can i said?! amazing. so smooth. thx for the help, man btw, this part, looks different in my car. maybe e90 and e92 is different? or maybe is because mine is xi? i didn't take pic of mine...
Hard to say why they're different. Most likely due to the different motor/tranny combination or (less likely) the all-wheel-drive system.

Honestly though, I'm not sure what all that tubing is doing there in the first place anyhow. Best I can think of is to keep the hot fluid from reaching the rubber clutch line and therefore expanding it. Now that I say that...it actually makes quite a bit of sense.

-Evan
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  #34  
By blox on 09-29-2006, 12:35 PM
I have a 2006 330xi.

I took a look at my CDV with the intention of pulling it out, but I was concerned about the lack of slack in the hose. I have a picture below of the hose -- looks like a tight turn already leading up to the CDV.

Am I right to assume we pull the two clips that I circled in red, and then pop the plastic part out and reconnect?

I think I will order a cleaned out one and replace rather than remove.
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Last edited by blox; 09-29-2006 at 03:00 PM.
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  #35  
By bavarian19 on 09-29-2006, 02:50 PM
I would love to do this mod. Where can you purchase the modified CDV for the E90?

I would also need the trusty hands of an experienced CDV-deleter...
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  #36  
By shimshimhada on 09-29-2006, 02:51 PM
Quote:
Originally Posted by bavarian19
I would love to do this mod. Where can you purchase the modified CDV for the E90?

I would also need the trusty hands of an experienced CDV-deleter...
http://www.zeckhausen.com/CDV.htm
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  #37  
By bavarian19 on 09-29-2006, 03:01 PM
Quote:
Originally Posted by shimshimhada

have you installed a modified CDV???
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  #38  
By shimshimhada on 09-29-2006, 03:11 PM
Quote:
Originally Posted by bavarian19
have you installed a modified CDV???
I assisted someone install my modified CDV.

It's actually pretty simple, I thought it would be hard. You just have to crimp the rubber hose, so brake fluid doesn't gush out. I got some in my eye. lol
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  #39  
By blox on 10-04-2006, 04:42 PM
Got my modified CDV and popped it in yesterday. Very easy.

Nice smooth clutch action now!
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  #40  
By hammyoni on 12-04-2006, 05:06 PM
anyone do this on a e90 without getting a modified CDV? wondering if there is enough slack to stretch without the CDV there
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  #41  
By 18LLC on 12-04-2006, 07:59 PM
Quote:
Originally Posted by hammyoni
anyone do this on a e90 without getting a modified CDV? wondering if there is enough slack to stretch without the CDV there
i put nothing there. should be okay.
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  #42  
By txusa03 on 12-04-2006, 10:20 PM
Evan, nice photos. being a noob manual driver (only 2 years manaual), I like to drive someone's car without the CDV before I terminate my CDV. Anyone in htown that removed their CDV would take me up on a test drive (lol)...
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  #43  
By Ray on 12-06-2006, 01:31 AM
Quote:
Originally Posted by shimshimhada
I highly recommend this modified CDV, which will fool all mechanics.

A local dealership voided my friend's (E46) transmission warranty after discovering the CDV was removed. This DIY is apparently very common with many M3's that visit their service station. Many of them probably had a CDV removal meet or something.
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