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Home >> BMW >> 2012 >> Alpina B7L >> Repair and Diagnosis >> Engine Performance >> Engine Control Systems >> Engine - Repair - F01/F02 >> 1131 Camshaft >> 1131034 Removing and installing/replacing right inlet camshaft (N63) >> Necessary preliminary work

Necessary preliminary work

(cylinder bank 1 to 4) 

IMPORTANT: The intake camshaft must first be rotated in such a way that the camshaft is free from tension when the bearing caps are released (risk of damage). 
IMPORTANT: No cam on the inlet camshaft is permitted to press directly onto a roller cam follower.
With cylinder no. 1 at 150° before firing TDC  there is no piston in the TDC position.

Rotate right inlet camshaft (2) at dihedron with a fork wrench (1) into a suitable position.

Fig 1: Rotating Exhaust Camshaft At Dihedron With Fork Wrench Into Suitable Position
G06888649Courtesy of BMW OF NORTH AMERICA, INC.
NOTE: Illustration shows cyl. 5 to 8.

Release bolts of camshaft bearings in sequence (10 to 1) in 1/2 turns.

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

Intake camshaft

Fig 2: Identifying Camshaft Bearings Bolts Releasing Sequence
G06888650Courtesy of BMW OF NORTH AMERICA, INC.
IMPORTANT: Used rocker arms (1) may only be reused in the same position.
NOTE: Rocker arms (1) are freely accessible after inlet camshaft has been removed.
Do "not" remove rocker arm (1) on intake side.
Fig 3: Identifying Rocker Arm
G06888651Courtesy of BMW OF NORTH AMERICA, INC.
IMPORTANT: Plain compression rings (1) can easily break.

If necessary, replace plain compression rings (1).

Press compression ring (1) on one side into groove, pull up on other side and remove catch.

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

Ends of compression rings (1) point upwards.

Fig 4: Locating Compression Ring End
G06888652Courtesy of BMW OF NORTH AMERICA, INC.

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

NOTE: The intake camshaft of cylinder bank 5 to 8 is marked with "E 5-8".
Fig 5: Identifying Camshaft Of Cylinder Bank Mark
G06888653Courtesy of BMW OF NORTH AMERICA, INC.
IMPORTANT: Rocker arms (1) slip slightly when inlet 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.

Fig 6: Identifying Rocker Arm
G06888654Courtesy of BMW OF NORTH AMERICA, INC.

Coat all bearing positions with engine oil.

Fig 7: Locating Bearing Positions
G06888655Courtesy of BMW OF NORTH AMERICA, INC.

Insert intake camshaft.

Insert inlet camshaft (1) so that cams point to side at cylinder 1 as shown in picture.

Fig 8: Positioning Inlet Camshaft So That Cams Point To Side At Cylinder 1
G06888656Courtesy of BMW OF NORTH AMERICA, INC.
IMPORTANT: Do not mix up the bearing caps of cylinders 1 to 4 and 5 to 8.
All bearing caps are coded and can only be installed in one position.

All bearing caps are marked with letters and numbers:

L= Cylinder bank 1-4.

R= Cylinder bank 5-8.

E= Intake side

A= Exhaust side

1= designation, bearing point, from 1 to 5

Fig 9: Identifying Bearing Caps Marks
G06888657Courtesy of BMW OF NORTH AMERICA, INC.

Insert all bolts.

Tighten down bolts in sequence (1 to 10) in 1/2 turns.

Tightening torque: 11 31 6 AZ .

Tightening torque: 11 31 7 AZ .

Fig 10: Right Intake Camshaft Bearing Cap Bolts Tightening/Loosening Sequence
G06888658Courtesy of BMW OF NORTH AMERICA, INC.

Install INLET ADJUSTMENT UNITS  .

Adjust VALVE TIMING  .

Assemble engine.

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