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Home >> BMW >> 2012 >> Alpina B7L >> Repair and Diagnosis >> Engine Performance >> Engine Control Systems >> Engine - Repair - F01/F02 >> 1131 Camshaft >> 1131036 Removing and installing/replacing left exhaust camshaft (N63) >> Necessary preliminary work

Necessary preliminary work

(cylinder bank 5 to 8) 

IMPORTANT: The exhaust 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 exhaust 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 exhaust camshaft (2) at dihedron with a fork wrench into a suitable position.

Fig 1: Rotating Exhaust Camshaft At Dihedron With Fork Wrench Into Suitable Position
G06888630Courtesy 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 .

Remove roller tappet from bearing cap (2 and 3) of high pressure pump and set down on special tool 11 4 480 .

Remove left exhaust camshaft and set down on special tool 11 4 480 .

Fig 2: Identifying Camshaft Bearings Bolts Releasing Sequence
G06888631Courtesy 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 exhaust camshaft has been removed.
Do "not" remove rocker arms (1) on exhaust side.
Fig 3: Identifying Rocker Arm
G06888632Courtesy 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
G06888633Courtesy of BMW OF NORTH AMERICA, INC.

Ends of compression rings (1) point upwards.

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

NOTE: Exhaust camshaft of cylinder bank 5 to 8 is marked with "A 5-8".
Fig 5: Identifying Camshaft Of Cylinder Bank Mark
G06888634Courtesy 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.

Fig 6: Identifying Rocker Arm
G06888635Courtesy of BMW OF NORTH AMERICA, INC.

Coat all bearing positions with engine oil.

Install exhaust camshaft (1).

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

Fig 7: Identifying Exhaust Camshaft
G06888636Courtesy 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 8: Identifying Bearing Caps Mark
G06888637Courtesy 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 .

Insert tappets for high-pressure pump.

Fig 9: Left Exhaust Camshaft Bearings Bolts Tightening/Loosening Sequence
G06888638Courtesy of BMW OF NORTH AMERICA, INC.

Install INLET ADJUSTMENT UNITS  .

Adjust VALVE TIMING  .

Assemble engine.

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