Check that the oil return duct of the turbocharger is not partially or fully obstructed by carbon deposits. Also check its thorough sealing.
Check, when re-assembling, that no foreign item does enter the exhaust manifold nor the turbocharger.
Apply high temperature paste on the screws/nuts on the area of the exhaust manifold / turbocharger.
Disconnect the negative battery terminal.
Check that the mating surfaces are clean and free from foreign items.
Fill the turbocharger with new motor oil up to the opening level of the turbocharger oil feed hose .
Place back the components in reverse order of the removal.
Start the engine and keep it it idle running.
Check there are no leaks.
Speed up to an engine speed of 3000 rpm.
Check there are no leaks ( exhaust , engine oil and engine coolant ).
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