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Home >> BMW >> 2013 >> Alpina B7 >> Repair and Diagnosis >> Engine Performance >> Engine Control Systems >> Engine - Repair - F01/F02 >> 1131 Camshaft >> 1131032 Removing and installing/replacing left inlet camshaft (N63) >> Necessary preliminary work

Necessary preliminary work

(cylinder bank 5 to 8) 

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 left inlet camshaft at dihedron with a fork wrench (1) into a suitable position.

Fig 1: Rotating Left Inlet Camshaft At Dihedron With Fork Wrench
G06888639Courtesy of BMW OF NORTH AMERICA, INC.

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
G06888640Courtesy 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
G06888641Courtesy 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.

Fig 4: Locating Compression Ring End
G06888642Courtesy of BMW OF NORTH AMERICA, INC.

Ends of compression rings (1) point upwards.

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
G06888643Courtesy 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
G06888644Courtesy of BMW OF NORTH AMERICA, INC.

Coat all bearing positions with engine oil.

Insert intake camshaft.

Fig 7: Locating Bearing Positions
G06888645Courtesy of BMW OF NORTH AMERICA, INC.

Insert inlet camshaft (1) so that cams point to side at cylinder 5 as shown in picture.

Fig 8: Positioning Inlet Camshaft So That Cams Point To Side At Cylinder 5
G06888646Courtesy 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:

L= Cylinders 1 - 4.

R= Cylinders 5 - 8.

E= Intake side

A= Exhaust side

1= designation from 1 to 5

Fig 9: Identifying Bearing Caps Mark
G06888647Courtesy 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 6AZ .

Tightening torque: 11 31 7AZ .

Fig 10: Left Intake Camshaft Bearing Cap Bolts Tightening/Loosening Sequence
G06888648Courtesy of BMW OF NORTH AMERICA, INC.

Install INLET ADJUSTMENT UNITS  .

Adjust VALVE TIMING  .

Assemble engine.

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