11 31 038 Removing and installing/renewing right exhaust camshaft (N74)

IMPORTANT: (cylinder bank 7 to 12)
With cylinder 1 in TDC firing position, the pistons are at the top in cylinders 1 and 6 Risk of damage!

For safety reasons, crank engine at central bolt back 30°.

Necessary preliminary tasks:

IMPORTANT: For safety reasons, crank engine at central bolt back 30°.

Fig 1: Identifying Camshaft Bearings Bolts Releasing Sequence

Courtesy of BMW OF NORTH AMERICA, INC.

Release bolts of camshaft bearings in sequence (1 to 14) in 1/2 turns .

Set down all bearing caps in a tidy and orderly fashion on special tool 11 4 480 .

Remove exhaust camshaft in upward direction .

IMPORTANT: Used rocker arms (1) may only be reused in the same position.

NOTE: Rocker arms (1) are freely accessible after exhaust camshaft has been removed.

Do "not" remove rocker arms (1) on exhaust side.

Fig 2: Identifying Rocker Arm

Courtesy of BMW OF NORTH AMERICA, INC.

IMPORTANT: Plain rectangular compression rings (1) can easily break.

Modify plain rectangular compression ring on new camshaft.

Press plain rectangular compression ring (1) on one side into groove, pull up on other side and remove latch mechanism.

Carefully pull plain rectangular compression ring (1) apart and remove towards front.

Fig 3: Identifying Plain Rectangular Compression Ring

Courtesy of BMW OF NORTH AMERICA, INC.

Ends of plain rectangular compression rings (1) point upwards.

Make sure plain rectangular compression rings (1) are engaged at ends.

NOTE: Exhaust camshaft (1) of cylinder bank 1 to 6 is marked with "A and 16".

Fig 4: Identifying Exhaust Camshaft Labelling

Courtesy of BMW OF NORTH AMERICA, INC.

IMPORTANT: Rocker arms (1) slip slightly when exhaust camshaft is fitted.

Make sure rocker arms (1) are secured as illustrated on hydraulic valve clearance compensating elements and on valves.

Align all rocker arms (1) straight.

Coat all bearing positions with engine oil. Insert exhaust camshaft.

Fig 5: Identifying Rocker Arm

Courtesy of BMW OF NORTH AMERICA, INC.

IMPORTANT: Coat all bearing positions with engine oil.

Do not mix up the bearing caps of cylinders 1 to 6 and 7 to 12.

All bearing caps are coded and can only be installed in one position.

Fig 6: Identifying Bearing Cap Code

Courtesy of BMW OF NORTH AMERICA, INC.

If both cylinder heads are removed at the same time, the respective bearing caps for each cylinder bank must be marked.

E = Intake side

A = Exhaust side

1 = Designation from 1 to 7

Fig 7: Right Exhaust Camshaft Bearing Cap Bolts Tightening/Loosening Sequence

Courtesy of BMW OF NORTH AMERICA, INC.

Fit all bearing covers .

Insert all bolts .

Tighten down bolts in sequence (14 to 1) in 1/2 turns .

Tightening torque: see 1AZ in 11 31 CAMSHAFT

Preload exhaust camshaft (1) with an open-end spanner (2) towards left.

NOTE: Graphic of cylinders 7 to 12.

Fig 8: Preloading Exhaust Camshaft With Open-End Spanner Towards Left

Courtesy of BMW OF NORTH AMERICA, INC.

Block exhaust camshaft with special tool 11 9 893.

Fig 9: Blocking Exhaust Camshaft Using Special Tool 11 9 893

Courtesy of BMW OF NORTH AMERICA, INC.

Install INTAKE ADJUSTMENT UNITS .

Adjust VALVE TIMING .

Assemble engine.