Problem with Gear 6 speed (Manual)

Phil40 · Post by **Phil40** » Thu Sep 03, 2020 5:22 am

Hi team

I have a little problem with my gear (6 speed) manual on my Z4 (2.3i Sdrive 120000 kms).
Well, when engine/gear box is "cold", i don't have difficult to use gear but after 1 or 2 hours of driving, i have difficult to use 2/3/4/5/6 speed...
Maybe gearbox is not enough cooled

I changed recently gearbox oil, it's seems a litle better but same problem.

If you have an idea, thanks in advance

tintoverano · Post by **tintoverano** » Thu Sep 03, 2020 5:51 am

did you do CDV delete? see it in my signature

for me, regardless of temperature , shifting to 1st and 2nd was harder

but after CDV delete and oil change all is very smooth now

Phil40 · Post by **Phil40** » Thu Sep 03, 2020 6:48 am

Hi tintoverano

I didn't know about CDV, i will try this mod

flybobbie · Post by **flybobbie** » Thu Sep 03, 2020 7:37 am

I tried 3-4 different oils in gear box. Best so far has been Redline MT-LV. Only oil that stopped the notchy 1-2 shift.
By that i mean the crunch that would occur engaging 2nd gear.

Nictrix · Post by **Nictrix** » Thu Sep 03, 2020 11:44 am

What about the clutch fluid?
Has it ever been bled through?

Phil40 · Post by **Phil40** » Thu Sep 03, 2020 11:55 am

There is clutch fluid ?

I didn't know that.
How long before Bleed / Flush Clutch Fluid ?

tintoverano · Post by **tintoverano** » Thu Sep 03, 2020 12:37 pm

clutch gets fluid from the brake fluid reservoir, worth checking that it is on the max, so that both the brake and the clutch gets fluid as expected

Nictrix · Post by **Nictrix** » Thu Sep 03, 2020 2:12 pm

As the fluid gets older it doesnt do the job as well as it used to and can make gearchanges more difficult as it is not fully working the clutch.
As it degrades further it can also cause creep while sitting at a standstill with the car in gear.
Does the clutch pedal feel any different when it gets like this?
Does the biting point change at all?

Chippie · Post by **Chippie** » Thu Sep 03, 2020 7:32 pm

I’d definitely look at changing the brake fluid making sure the new fluid is pushed through to the clutch, it could have moisture in the old fluid which could alter the point at which the clutch is released causing the gear change problem when hot.

Mr Tidy · Post by **Mr Tidy** » Thu Sep 03, 2020 8:44 pm

And if you are changing the fluid that is the perfect time to remove the Clutch Delay Valve.

Phil40 · Post by **Phil40** » Fri Sep 04, 2020 5:04 pm

Yes CDV and Clutch fluid to change

Thanks guys

Phil40 · Post by **Phil40** » Sun Feb 07, 2021 10:58 pm

Phil40 wrote: ↑Fri Sep 04, 2020 5:04 pm Yes CDV and Clutch fluid to change
Thanks guys

Hi team

I found a website selling CDV already "changed" but i lost the name of this website

If anyone have it ..

Smartbear · Post by **Smartbear** » Sun Feb 07, 2021 11:08 pm

Phil40 wrote: ↑Sun Feb 07, 2021 10:58 pm
Phil40 wrote: ↑Fri Sep 04, 2020 5:04 pm Yes CDV and Clutch fluid to change
Thanks guys
Hi team
I found a website selling CDV already "changed" but i lost the name of this website
If anyone have it ..

You don’t need to buy anything, just remove the cdv from your car

Rib

Phil40 · Post by **Phil40** » Sun Feb 07, 2021 11:47 pm

Smartbear wrote: ↑Sun Feb 07, 2021 11:08 pm You don’t need to buy anything, just remove the cdv from your car
Rib

Oh thanks for your advice, just remove CDV and plug pipes directly between them ?

flybobbie · Post by **flybobbie** » Mon Feb 08, 2021 12:16 am

Same on Z4.
https://www.1addicts.com/forums/showthread.php?t=209440

I also replaced the rubber pipe with braided.

All in it removed the judder i was getting when taking off cold.

Z4-forum.com

Z4-forum.com