MVS Forums moderator Abscate shows us how to adjust the turbo wastegate, with photos:
Well, technically its a wastegate actuator (WGA) adjustment (for erik) 😀
Following the document in the VRD and using the IPD turbocharger tool:
You have to be careful to get the right pressure at the time of adjustment as the pressure slowly (over 10 minutes) creeps up from the correct 30 kPa (for my B5423T3 turbo -see chart for your engine)
The threads are a peculiar M6x 0.80 – a standard M6 1.00mm thread will not fit. I found my locknut was also too loose for a 10mm wrench and too big for a 9mm, no doubt from sitting on top of hot turbo for 17 years. A vice grip freed it up, with another vice grip firmly stopping the rod from turning.