Splitpin

I answered your question re. leaks from the v-band and a broken centre housing in the last thread you started on this subject. To echo Simon's comments, the centre housing is a solid cast component - and the water jacket is cast in. The only way water could leak out would be if the housing had cracked, and it's next to unheard of for this to happen. If it had, your turbo would be totally knackered and as has been said you'd know it. You wouldn't be trying to localise subtle leaks.

If you try this remember that you need to partially drain your coolant system first, or you'll lose the contents of the header tank + more when you take the coolant supply pipe off the turbo.

TBH there's not a lot of point doing it. You'd be better off getting a torch and a dentist's mirror and poking around actually looking for drips. If it isn't the banjo bolts connecting the hardpipes to the centre housing, it'll be coolant seeping out of the one of the hardpipe-softpipe joints.

Also don't forget to examine the banjo bolt connecting the supply pipe to the cylinder head. Wherever it's coming from, if you're running the correct percentage of coolant in with the water, you should see white dried deposits of it around the source of the leak.

Careful or someone will set the moderators on you. This is Scoobynet, the place where bull and rumour take logic out for a fight and duff him up, and where "fact" is defined as "any old sh*t that gets repeated often enough for people to accept it without question". If you want logic, try 22B.