Originally Posted by
ROSSCO,STI4
I changed the copper seals on the banjo bolts again. It still leaks . It must be leaking from the turbo , there is nowhere else it can be . looks like i need a new turbo
If it's leaking, you
must by definition, be able to see water dripping from somewhere. If you have a centre housing that has cracked in such a way that water can leak from the jacket to the outside, but oil doesn't, while the turbo remains fully functional, you are probably in a minority of one on the entire planet.
If this liquid is coming from the turbo assembly it is coming from one of the following places:
1. supply/return hardpipe banjos on the centre housing
2. supply pipe banjo on the back of the head
3. supply/return hardpipe to softpipe joints
4. any press-fitted blanking plugs in the turbo centre housing (almost impossible)
5. return softpipe to expansion tank joint
If you have positively ruled out all the above, there's no point shelling out on a new turbo, because it's almost certainly not at fault. You might as well stick with the diagnosis until you're sure it's nailed down rather than replace bits in the blind hope of fixing it.
What's happening to your coolant level, by the way, does it constantly need topping up?