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DIY Clutch Delay Valve Delete

impee's DIY CDV Delete for BMW 318i e46
How to Delete the Clutch Delay Valve yourself!

Difficulty Level: Easy

Approximate Time For This Project: 60 mins

Prices: Professional labour costs for CDV Delete - £35 (private) or £155 (BMW) - per hour X 0.5 hours

Brake Fluid DOT 4 Part # 427508969
It only comes in 1 litre bottles.
BMW 1 £9.00
17mm Spanners You need 2x 17mm, so you need to buy 2 sets. 2 £3.62
11mm Spanner If not available, use an adjustable wrench. 1  
G Clamp 50mm is sufficient enough 1 £1.45
Trolley Jack Should support up to 2 Tonnes. 1 £30
Jack Stands / Axle Stands Should support up to 2 Tonnes.
To lift car on stands, refer to this page.
2 £15
Tissues     4  
Disposable Rubber Gloves Pair   2  
A 2nd Person to help To assist in the manual bleed of the clutch.   1  

*prices correct at time of publication

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1) Assemble Your Kit + Notes

Below is the total kit I used. As you can see, there aren't many tools required for this job at all. The brake fluid will be used in the Clutch Bleed at the end of this DIY.

The Clutch Delay Valve in simple terms delays the clutch engaging rapidly by using its narrow passage hole to restrict the brake fluid passing. This is to restrict sudden clutch releases / drive offs etc. However, this leads to jerks during 1st and 2nd gear changes, also very often you car starts jerking / jumping when you try to drive of quickly in 1st gear. After removing this, most of these issues will be resolved.

A diagram of the Clutch Delay Valve Part #15.

CDV Delete Kit


2) Car On Jack Stands

The car should be be lifted on 2 Jack Stands at the front, but if you need more place to work, then lift the rare of the care too.

I personally leave the actual car Jack / Trolley Jack still raised under the car, close to where I work, just to provide me with some insurance incase any of the Jack Stands fail!

For more details on lifting the car on Jack Stands, please refer to this page.

BMW e46 on Jack Stands


3) Shields - Removal

Some DIYs state there may be 2 plastic shields to cover the engine parts of the car, however mine did not have any. Either my car never had them, or my mechanic took them off and kept them!

Take off the 2 shields by removing their nuts and clips. You will need a 8mm socket.
The smaller shield should be removed first.


3) The Clutch Delay Valve (CDV)

The Clutch Delay Valve (CDV) is located next to the transmission, connected to the squigly metal pipe that leads to the Output Cylinder Cluth and the cluth bleeder.

You can have a look at the diagram Clutch Control diagram to clearly understand the layout. You will be removing the Clutch Delay Valve (CDV) that is #15 and simply reconnecting #10 and #14 - they will screw straight into each other. The CDV is connected to the #14 with a 17mm fitting and on the other end by 11mm to the #10 Pressure Hose.

Clutch Control


4) Clamp the Pressure Hose

Use the G Clamp and block of the #10 Pressure Hose to avoid any fluid leakages during the DIY. This is a quite fiddly as when the clamp tightens, it tends to slip.

Note: Do not over tighten the clamp, after all it is a rubber hose and could get damaged.

CDV Pipe Clamp


5) Remove / Delete the CDV - Part 1/2

Use a 11mm spanner to hold the connector on the left side of the small bracket. if you don't have a 11mm spanner, use an adjustable wrench, but be very careful not to damage the nut.

Use 17mm spanner to loosen the CDV on the right side of the bracket and then undo the 11mm nut on the left with your hand to detach it from the CDV. Once this detaches, you may get a couple of drops (or a bit more) of brake fluid leak will out, so be prepared with a tissue or drip pan.


CDV Deletion

CDV Loosen nut


6) Remove / Delete the CDV - Part 2/2

Next use 2x 17mm spanners to remove the CDV. One to hold the 17mm connector still connected to the CDV and one to loosen the CDV. You may find that you have to apply quite a bit of pressure to loosen and remove the CDV.

Deleting the CDV


7) Re-assembly

Now work in reverse order following all the above steps.

Use a 17mm spanner and 11mm spanner to re-connconnect the connectors through the bracket, but do not over tighten them.

Remove the clamp.

Now press the clutch a few times and check there is no leak from connections that you tightened.

Refit Pipes

CDV been Deleted


8) Finishing Steps

Finally bleed the clutch following my DIY guide on this page.

Take the car for a test drive and you will notice the gear change for the 1st and 2nd gear will be a alot smoother. Also you can actually drive off from stand still a lot quicker and smoother.

Below is the removed / deleted CDV.


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DIY BMW e46 Clutch Delay Valve (CDV) Delete by - impee

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