Parts Catalog Accessories Catalog Tech Info Tech Forums
 
Follow Pelican Parts on Facebook Follow Pelican Parts on Twitter Follow Pelican Parts on Instagram Follow Pelican Parts on YouTube Follow Pelican Parts on Pinterest Follow Pelican Parts on Tumblr
  Search our site:    
View Recent Cars  |   Cart  | Project List | Order Status | Help    
 >  >
Clutch Delay Valve Replacement
 
Bookmark and Share

Pelican Technical Article:

Clutch Delay Valve Replacement

Nick Czerula

Time:

1.5 hours

Tab:

$100

Talent:

****

Tools:

17mm, 18mm wrench, 11mm line wrench

Applicable Models:

BMW 323Ci Coupe/Conv (1999-00)
BMW 323i Sedan/Wagon (1999-00)
BMW 325Ci Coupe/Conv (2001-06)
BMW 325i/xi Sedan/Wagon (2001-06)
BMW 328Ci Coupe (1999-00)
BMW 328i Sedan (1999-00)
BMW 330Ci Coupe/Conv (2001-06)
BMW 330i/xi Sedan (2001-06)

Parts Required:

Clutch delay valve; clutch hydraulic fluid

Hot Tip:

Check clutch slave and master for leaks before beginning.

Performance Gain:

Positive clutch feel

Complementary Modification:

Front inspection

The clutch in manual transmission-equipped BMW E46 models is hydraulically operated. When the driver presses the clutch pedal down, a push rod attached to the top of the pedal presses a piston inside the clutch master cylinder, which is attached to the top of the pedal cluster. The clutch master cylinder fluid supply is from the brake fluid reservoir on the front of the engine compartment bulkhead. Fluid from the clutch master cylinder is pushed through a fluid line to the clutch slave cylinder at the transmission bellhousing. The slave cylinder piston then pushes on a rod, which operates the clutch release lever and ultimately releases the clutch for purposes of shifting gears.

The hydraulic line between the clutch master cylinder and clutch slave cylinder has a delay valve installed. The valve, a fitting with a restricted orifice, helps to release the clutch evenly and smoothly. It is meant to improve clutch feel and apply and release the clutch at a designated rate. However, some drivers prefer a snappier clutch. This is where replacing the clutch delay valve comes into play. You can purchase a modified factory clutch delay valve that takes the place of the orifice and allows full hydraulic fluid volume to flow. When replacing the valve, you will have to work with hydraulic clutch fluid, so wear proper hand and eye protection. Also be prepared to bleed your clutch; have a friend nearby. 

Do not attempt to drill out your factory clutch delay valve. Doing so can damage the conical sealing surface and will result in a hydraulic leak and improper clutch operation.

To avoid marring the trim if you need to pry anything, work with a plastic prying tool or wrap a screwdriver tip with masking tape before prying out trim panels, switches or electrical accessories.

Keep in mind that when your car was serviced before, parts may have been replaced with different size fasteners used in the replacement. The sizes of the nuts and bolts we give may be different from what you have, so be prepared with different size sockets and wrenches. 

Protect your eyes, hands and body from fluids, dust and debris while working on your vehicle. If you are working with the electrical system, disconnect the battery before beginning. Always catch fluids in appropriate containers and properly dispose of any fluid waste. Recycle parts, packaging and fluids when possible. Do not work on your vehicle if you feel the task is beyond your ability. 

Vehicle models change and evolve, as they grow older, so the vehicle shown in our illustrations may vary slightly from yours. If something seems different, let us know and share your info to help other users. Do you have questions or want to add to the article? Leave a comment below. When leaving a comment, please leave your vehicle information.

Jack up the front of your vehicle. See our tech article on jacking up and supporting your vehicle.

Working at side of transmission, locate the clutch delay valve (green arrow).
Figure 1

Working at side of transmission, locate the clutch delay valve (green arrow).

Using a pair of hose pliers, clamp off clutch hydraulic hose (green arrow).
Figure 2

Using a pair of hose pliers, clamp off clutch hydraulic hose (green arrow). This stops fluid in the clutch master cylinder from leaking during procedure.

Counterhold clutch delay valve (purple arrow) while loosening slave cylinder steel line (green arrow).
Figure 3

Counterhold clutch delay valve (purple arrow) while loosening slave cylinder steel line (green arrow).

Using an 18mm open-end wrench on clutch delay valve and an 11mm line wrench, loosen steel line as noted in previous step.
Figure 4

Using an 18mm open-end wrench on clutch delay valve and an 11mm line wrench, loosen steel line as noted in previous step.

Counterhold clutch hydraulic hose (purple arrow) while loosening clutch delay valve (green arrow).
Figure 5

Counterhold clutch hydraulic hose (purple arrow) while loosening clutch delay valve (green arrow).

Using a 17mm open end wrench and an 18mm open end wrench, loosen clutch delay valve as noted in previous step.
Figure 6

Using a 17mm open end wrench and an 18mm open end wrench, loosen clutch delay valve as noted in previous step. Unscrew steel line from clutch delay valve. Once steel line is removed from clutch delay valve, pull hydraulic hose out of mounting bracket, then unscrew clutch delay valve from hydraulic hose. Screw new clutch delay valve into hydraulic hose. Then install in mounting bracket; be sure to install in correct orientation. Then install steel line into clutch delay valve. Tighten clutch delay and hydraulic hose connection. Then tighten steel line.

Once complete, bleed clutch hydraulic system.
Figure 7

Once complete, bleed clutch hydraulic system. Top up brake master cylinder fluid reservoir (green arrow). Then have assistant push down and hold clutch pedal, open bleeder screw to relieve pressure, close bleeder screw, then have assistant release clutch pedal. Repeat this procedure until clutch pedal has good firm feel. Monitor fluid so you do not run out during bleeding.

Bookmark and Share

  Search our site:    

View Cart & CheckOut | Project List | Order Status |  Help    

 

[Home] [Customer Service] [Shopping Cart] [Privacy Statement]
 [Contact Us] [About Us] [Shipping] [Map to our Location] [Careers]

Copyright © Pelican Parts Inc.

Page last updated: Fri 12/9/2016 02:19:30 AM