Reinstalling a CDV in an E46 330i

[applehero]

Hello all!

I got the clutch and flywheel changed recently on my E46 330i - incredibly worrying process - two of the main tabs on the engine block were stripped, and actually sheared off when the gearbox bolts were removed. Luckily it was possible to fix the situation by epoxying the tab back on and putting a bolt through with a nut fastening it down.

I was waiting for the clutch change to bleed the clutch system and while I was at it decided to remove the CDV (Clutch Delay Valve). Problem was, it wasnt there! One of the PO's must have removed it.

After the clutch change sometimes I experience a judder on pull off. Especially if it is at low speed. Now I wonder if the CDV would actually help with this. My question is this: does anyone in the community have an undamaged CDV they removed off their E46 (Part Number: 6755892) that they are willing to donate for testing purposes? If I keep it, I am happy to pay a fair price for it. If not, I am happy to send it back.

I have heard that it makes a big difference to remove the CDV, to others it wasnt noticeable. Would be great to be able to try for myself.

 

[Nikhil]

I think your problem lies elsewhere. Have you checked your flywheel for uneven wear?

 

[Nikhil]

I think your problem lies elsewhere. Have you checked your flywheel for uneven wear?

Just saw that you replaced the flywheel :hammerhead:

 

[Andy1GP]

I have plenty of them if you want one. The petrol variants have a smaller orifice compared to the diesels. I also have from 330d's that have a slightly larger orifice.

I would suggest bleeding the system from below. Not by pumping the clutch pedal as a 2 man team would. Rather connect a reservoir (i used a basic oil can) open the bleed and pump it up from below. You'll notice the bubbles in the reservoir.

Otherwise send me a pm to collect the cdv.

 

[applehero]

I think your problem lies elsewhere. Have you checked your flywheel for uneven wear?

Just saw that you replaced the flywheel :hammerhead:

:=): The judder only started after the change too.

I have plenty of them if you want one. The petrol variants have a smaller orifice compared to the diesels. I also have from 330d's that have a slightly larger orifice.

I would suggest bleeding the system from below. Not by pumping the clutch pedal as a 2 man team would. Rather connect a reservoir (i used a basic oil can) open the bleed and pump it up from below. You'll notice the bubbles in the reservoir.

Otherwise send me a pm to collect the cdv.

Thanks Andy. PM sent.

I am a little confused on how to do the bleeding from below. Would you remove the slave cylinder from the gearbox housing and push on the end of that? Or rather push through the brake fluid using the oil can?

 

[Sandman]

This is a interestin post, the cdv is suppose to restrict the amnt of fluid and u actualy want to reinstall it i installed a modified clutch on my E36 and the pipe just b4 the cdv actually started leaking, presuming from back pressure because it happened a week aftr the clutch install. So i removed my cdv and had to install a new pipe, and my clutch become alot softer and more driveable.
The main reason for removing it for most guys was for a smoother pull away. Anyway keep us updated.

Sent from my SM-J500F using Tapatalk

 

[applehero]

So... A bit of an update is necessary. In December last year, AndyGP graciously gave me 2 CDV's to try out. Cheers bud!

Finally the weather has improved and I have found some time to reinstall this on my car. Initial feelings - wow! As soon as I pressed the clutch pedal, I was immediately reminded of the "classic" BMW feel. I love the feel of the pedal. Others may not.

Without the valve, the bite point was well defined but the force needed to get the pedal to that position was high. With the valve reinstalled, there is a more consistent feel across the pedal travel, but the bite point is harder to notice.

In terms of the juddering, that hasn't gone away but has improved slightly. That will need some more investigating.

In the end, I am happy with the characteristic BMW clutch feel. :rollsmile:

 

[Gizmo]

How sure are you the flywheel was replaced at the same time as the clutch?

 

[Gizmo]

A juddering clutch is a telltale sign of a worn dual mass flywheel.

 

[applehero]

How sure are you the flywheel was replaced at the same time as the clutch?

As sure as one can be without seeing it myself...

A juddering clutch is a telltale sign of a worn dual mass flywheel.

It could be how the gearbox was mounted to the engine, or the gearbox is on its way out...