PastyMuncher83

Active Member

• Apr 10, 2025

• #1

Hi Guys, has been a while since I posted here after enjoying L322 ownership for the last 5 years, following years of P38 ownership.
I am experiencing the inevitable TD6 gearbox issues, approaching 140k miles.

Does anyone on here know where I can purchase a new Sonnax valve block assembly here in the UK?

Best regards.

 

backinblack

Well-Known Member

Full Member

• Apr 10, 2025

• #2

Have you tried contacting them directly.

 

PastyMuncher83

Active Member

• Apr 10, 2025

• #3

I have contacted one of their UK distributors who were unable to provide one.
However they did helpfully provide me with a company that will refurb my existing one.
Seems like the best available option.

 

backinblack

Well-Known Member

Full Member

• Apr 10, 2025

• #4

Mine was refurbished by a fairly local gearbox specialist around 6 years ago for £1.5k including TC.

 

B

Bemble

Well-Known Member

• Apr 10, 2025

• #5

There’s no longer such a thing as a Sonnax valve body assembly. I would suggest that you send your worn unit to someone like Valve Bodies UK http://www.valvebodyuk.co.uk/ or STA Aylesbury https://www.staautogearbox.co.uk/ who own a Hydra-Test machine that can test the complete assembly and identify which, if any, of the valves needs replacing with the Sonnax versions.

Phil

 

PastyMuncher83

Active Member

• Apr 11, 2025

• #6

Thanks for your input. Will be removing it again and sending to Valve Bodies UK for a refurb.

 

PastyMuncher83

Active Member

• Thursday at 13:49

• #7

Hi Guys, quick update on this. I had the valve block refurbished and tested. There was an issue with the 4th gear piston and cylinder, which was reamed out and a sonnax item put in its place.

However, upon reinstalling the valve block, every second ignition cycle/drive it goes into Trans Failsafe. Scanning for fault codes I get P0733. Gear monitoring 3. If I clear the code and drive the car it drives fine, until I switch it off and drive it again. Then the same thing happens.

Is there a procedure I should try to reset the adaptive values to cure this, or is it the end of the road for my L322?!

Using Hawkeye pro diagnostics, if I test each solenoid, the command completes and seem to be working as they should.

Many thanks