Prepare for the installation of the turbocharger

Check the screw-in depth (A) of the upper stud bolt (1), if necessary screw in the stud bolt (1) further and unscrew it.
Check the screw-in depth (B) of the upper stud bolt (2), if necessary screw in the stud bolt (2) further and unscrew it.

TECHNICAL DATA SPECIFICATIONS

Screw-in depth of upper stud bolts on cylinder head
Dimension A	30 mm
Dimension B	26 mm

Courtesy of BMW OF NORTH AMERICA, INC.

If necessary, fix the stud bolt (1) with screw locking agent.

Adhesive
Screw lock Loctite 273, high strength	50 ml, Bottle	83190443083

NOTE: RISK OF DAMAGE
Damage to the surface.
The use of metal-cutting tools (e.g., emery cloths) for cleaning surfaces can damage them and lead to leaks and/or engine damage.

Do not use any metal-cutting tools.

Courtesy of BMW OF NORTH AMERICA, INC.

Clean sealing surfaces on exhaust manifold and cylinder head (1) with special tool 0 495 102 (11 4 470) .
Check the nuts for correct fit in sequence (1) to (5).

TIGHTENING TORQUES SPECIFICATIONS

Trim strip at the cylinder head
M7	Tightening torque	18 Nm

Fig 1: Trim Strip At Cylinder Head Nuts Tightening Sequence

Courtesy of BMW OF NORTH AMERICA, INC.

Check the oil feed lines and oil return lines for contamination or obstruction, clean or replace if necessary.
If the oil feed lines or oil return lines are heavily contaminated, it is recommended that the engine oil and oil filter are changed.
If installed: Check the coolant feed lines and coolant return lines for the turbocharger for contamination or obstruction and clean or replace as needed.
Check the screw connections and plug connections of all lines for accuracy.
Check air cleaner for contamination and clean or replace as needed.
Check correct functioning of crankcase ventilation.
Replace all gaskets.
Parts: Seals