The Clutch Delay Valve (CDV) - E36, E46 & E39

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Thread: The Clutch Delay Valve (CDV) - E36, E46 & E39

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  1. The Clutch Delay Valve (CDV) - E36, E46 & E39 
    #1
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    MONSTER's Car Details
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    I have been researching this a little bit and the out come...

    Diagnosis - Jerky movements when changing up through the gears & not being able to release all of the power when wanted.

    Slow clutch engagement on E36, E46, E39, and E53

    Many owners of the E36, E46 3-series, E39 5-series, and Z8 cars have noticed that they will get an excessive amount of clutch slippage and poor clutch engagement feel. This problem is most noticeable in situations calling for hard acceleration or quick shifting.

    The cause is an added check valve (BMW refers to this as the "E36 Lock Valve (21)" & "E46 Lock Valve (15)" and we call it a CDV) in the clutch hydraulic circuit that is intended to slow the engagement of the clutch as you release the pedal. This constant engagement device is intended to smooth out the feel of shifts and potentially reduce the shock load on the drivetrain. The reality is it causes a high rate of wear on the clutch and excessive heat build-up in the flywheel leading to early failure.

    ...and also on E36 M3/Z3M 3.2l with a aftermarket lightweight flywheels!

    A little-known detail about the 1996-1999 M3/MZ3 3.2l (including Euro cars) is that they too have this part. Similar to the affliction of the E46 and E39, except this valve seems to affect cars with aftermarket lightweight flywheels ever so more than those that have standard flywheels. Due to the quick-revving nature of these setups, the slow-down of the check valve causes momentary excessive clutch slippage. A particular example is a "power shift" where the revs hang for a moment before fully engaging. E36 M3s with the 3.0l (1992-1995) engine do not have this part - Most other E36 do have the CDV - Listed below (thanks to Pangster)

    Click for larger image - Below E36 & other models possible locations of the Lock Valve (CDV)


    Click for larger image - Below E46 & other models possible location of the Lock Vavle (CDV)


    This is what a CDV looks like - image below



    Removal of the valve in these cars results in very crisp and firm shifts. With a lightweight flywheel, the engagement is so positive and quick that passengers are pushed into the seat with greater force than ever before.

    The good news is this valve can be removed from the system with no additional parts required. The check valve is threaded into the clutch slave cylinder with an end that matches the end on the metal hydraulic line so all that needs to be done is remove the valve assembly and reinstall the line to the slave cylinder. Bleed any air out of the hydraulics and you are done.

    With a Big thanks to Pangster! Here is a link to show E36, E46 & Z3 models with the CDV

    Hope this is useful to any one with any of these models of BMWs

    Thank you to those below...

    Compiled with information contributed by Paul Dzimian and Rob Levinson - EDITED by Devil318iS

    Source of info - Copyright 2000-2003 Chiba Technologies, Inc. All rights reserved. 908.874.9092 Visit us on the web at http://www.uucmotorwerks.com
    Last edited by MONSTER; 11-10-2011 at 22:04. Reason: Editing


    E36 328i se - Journal
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    Z3M Short Shifter
    E36 M-Tech Evo Steering Wheel Tri-Stitching
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  2. The Following 6 Users Say Thank You to MONSTER For This Useful Post:

    Beej (18-04-2012),ElectricGer (06-10-2011),Ferret (03-10-2011),GL0D (16-10-2011),pangster (02-10-2011),The Panther (03-10-2011)

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  4.  
    #2
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    This video should help as well... - Go to 6:00 mins and you will see Edd point to it... well thats what I think...

    Last edited by MONSTER; 02-10-2011 at 05:36.


    E36 328i se - Journal
    Modifications Done
    Storm Motorwerks V2 Titanium Shifter & V1 Handbrake
    Z3M Short Shifter
    E36 M-Tech Evo Steering Wheel Tri-Stitching
    E36 M-Tech Bumpers
    E36 M3 GTII Splitters
    E36 M3 Mouldings
    E34 Style 21's Throwing Stars
    Retro Fitted Auto-Dim Mirror
    Alpine CDE-113BT
    K&N RU-2590 Custom Intake
    Angel Eyes & HIDs
    Goodridge Brakehose
     
     

  5.  
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    How can it cause excessive heat and early flywheel failure??????? That's utter rubbish mate..all it does is restrict the release of the compressed fluid for a smoother clutch engagement! !!
     
     

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    MONSTER (03-10-2011)

  7.  
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    Quote Originally Posted by alan7869 View Post
    How can it cause excessive heat and early flywheel failure??????? That's utter rubbish mate..all it does is restrict the release of the compressed fluid for a smoother clutch engagement! !!
    A slipping clutch generates heat...

    Have you had to remove/replace one? Have you had a BMW with one? So you dont believe it should be removed?

    Please share you experiences!
    Last edited by MONSTER; 03-10-2011 at 02:35. Reason: Spelling


    E36 328i se - Journal
    Modifications Done
    Storm Motorwerks V2 Titanium Shifter & V1 Handbrake
    Z3M Short Shifter
    E36 M-Tech Evo Steering Wheel Tri-Stitching
    E36 M-Tech Bumpers
    E36 M3 GTII Splitters
    E36 M3 Mouldings
    E34 Style 21's Throwing Stars
    Retro Fitted Auto-Dim Mirror
    Alpine CDE-113BT
    K&N RU-2590 Custom Intake
    Angel Eyes & HIDs
    Goodridge Brakehose
     
     

  8.  
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    MONSTER (03-10-2011)

  10.  
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    More clutch slip more heat more wear simples, worth noting that I have removed the clutch delay valve on my 328 sport and if you want to keep the original bracket that holds it you can actually drill it out with out messing up the mating surfaces.
     
     

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    MONSTER (11-10-2011)

  12.  
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    CDV removed! It is now smoother when changing gears!!!!

    CDV below from a 1995 E36 328i se Saloon







    Now get yours removed to feel the benifits!





    *EDIT - This to be a sticky would be a good idea??????????????????????????????
    Last edited by MONSTER; 12-10-2011 at 04:18. Reason: Read *EDIT


    E36 328i se - Journal
    Modifications Done
    Storm Motorwerks V2 Titanium Shifter & V1 Handbrake
    Z3M Short Shifter
    E36 M-Tech Evo Steering Wheel Tri-Stitching
    E36 M-Tech Bumpers
    E36 M3 GTII Splitters
    E36 M3 Mouldings
    E34 Style 21's Throwing Stars
    Retro Fitted Auto-Dim Mirror
    Alpine CDE-113BT
    K&N RU-2590 Custom Intake
    Angel Eyes & HIDs
    Goodridge Brakehose
     
     

  13.  
    #8
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    Here is a link... for a HOW TO... Just ignore that they are trying to sell you "modded" one just put the hose back in from where the CDV was... Easy... Mind you I didn't do it... my Techy did...

    http://www.zeckhausen.com/cdv.htm#CDV%20by%20mail

    Get it removed... the shift is so much better!!!


    E36 328i se - Journal
    Modifications Done
    Storm Motorwerks V2 Titanium Shifter & V1 Handbrake
    Z3M Short Shifter
    E36 M-Tech Evo Steering Wheel Tri-Stitching
    E36 M-Tech Bumpers
    E36 M3 GTII Splitters
    E36 M3 Mouldings
    E34 Style 21's Throwing Stars
    Retro Fitted Auto-Dim Mirror
    Alpine CDE-113BT
    K&N RU-2590 Custom Intake
    Angel Eyes & HIDs
    Goodridge Brakehose
     
     

  14.  
    #9
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    roadwolf's Car Details
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    Quote Originally Posted by pangster View Post
    I wouldn't take any notice of that list, since when did autos have a clutch hose.
     
     

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    my clutch on my 1996 328i has always been very jerky when comin off it, will removing this help smooth it out then if so im gonna remove it tomorrow?
    328I SPORT
     
     

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