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How-To: Remove Clutch Delay Valve (CDV)

79K views 70 replies 37 participants last post by  Lowlife Lowrider  
I've already done this and Cam (ExtremePower) decided to do the write-up for it. Thanks for that btw. This mod does improve clutch pedal feel and allows you to get better control over the clutch pedal.

For anyone who has trouble with this DIY, just follow the clutch hose down to where the bleeder is. You'll see that little delay valve, pictured 2nd from the bottom in the original post, connected inline after the clutch hydraulic hose. This mod involves removing that delay valve and plugging the hydraulic hose straight into the clutch slave cylinder; thereby bypassing the delay valve and eliminating the restriction. Note that the Chevy Sonic does not have this delay valve; this was installed intentionally to help beginners learn how to drive a manual and can be safely removed. Just hang onto the clip in case you for some reason decide to reinstall it, although I can't fathom a reason.

I highly recommend this as an easy, free mod.
 
I did this over the weekend in all of 5-10 minutes. No more grind on the 1-2 shift, and the 2-3 shift is much less notchy. I would highly recommend it!
Give it time before concluding that your 1-2 grind is gone. Heat up the transmission a bit on some hard driving and warmer weather and you'll still hear that grind. The week after I did this on my car, I had a fellow Cruze owner riding that wanted to feel the power from the BNR tune and I got the 1-2 shift to grind twice in the same shift, with the clutch pedal firmly planted in the wall.

The only thing that actually fixed it was draining my AMSOIL Synchromesh out and putting AMSOIL 75w-90 GL-4 back in.
 
Are there any other threads covering what can help the issue? I noticed it a little bit this morning when the engine was cold, but it went away after a little bit of driving.
Plenty of discussion on this topic. The first primary solution has been to switch to one of two AMSOIL fluids, either Synchromesh or the 75W-90 GL-4. The latter almost completely cures the problem at the expense of some stiffness on cold mornings for the first few shifts.

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Note that this mod only addresses half the problem. There is still a clutch fluid accumulator that absorbs high speed clutch maneuvers, which prevents the clutch from disengaging on fast shifts. I'm working on a bypass for that currently.
 
I just did this to my car today. Probably the best time vs. result mod that you can do if you have a manual transmission. I'm actually a little mad that GM put the restrictor in. One of the big dings on the Cruze is the feel of the clutch and transmission and now I know why. Removing the restrictor doesn't change the clutch pedal effort at all but it's obvious that the clutch is releasing faster. It's very noticeable during the 1-2 shift. I always felt like I was fighting the clutch and it was so inconsistent. It makes me wonder if there was a durability concern with the M32 or the clutch that made them include this, but I can't imagine that driveline shock is worse than dragging the clutch and putting more wear on the synchros. I wish I had found this earlier instead of at 135,000 miles.
Time to get the clutch accumulator bypass next to finish this off!

https://www.cruzetalk.com/forum/10-gen1-powertrain/236181-gen1-cruze-clutch-shifting-upgrades.html
 
I did this and now out of no where no slipping or nothing he clutch is not disengaging at all I changed the clutch. It it didn’t really look worn out it all back together bleed it and now it budges when I try to take off in any gear including reverse and the. Seems like the clutch slips and I go nowhere I’m currently doing the run down on the whole system to figure out the problem I’m gonna open it up do the flywheel check the new clutch pressure plate and throwout bearing replace the slave put the cdv back in and if that doesn’t work on to the accumulator anyone else had issues I’m not sure this was the problem
Bleed the clutch with a proper bleeder. If that fails, you have an issue with the accumulator. Good time to do the BNR accumulator bypass.