11 34 715 Replacing All Valve Springs (N73)

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NOTE:

For Special Tool identification, see ENGINE- SPECIAL TOOLS .

Special Tools Required:

11 0 346
11 9 000
11 9 014
11 9 470

Necessary Preliminary Tasks:

Remove left cylinder head cover. Refer to 11 12 005 REMOVING AND INSTALLING/SEALING LEFT CYLINDER HEAD COVER (N73) .
Remove right cylinder head cover. Refer to 11 12 006 REMOVING AND INSTALLING/SEALING RIGHT CYLINDER HEAD COVER (N73) .
Remove inlet and exhaust adjustment unit on left side. Refer to 11 36 047 REMOVING AND INSTALLING/REPLACING INLET AND EXHAUST VANOS ON LEFT SIDE (N73) .
Remove inlet and exhaust adjustment unit on right side. Refer to 11 36 047 REMOVING AND INSTALLING/REPLACING INLET AND EXHAUST VANOS ON LEFT SIDE (N73) .
Remove left intermediate lever. Refer to 11 37 012 REMOVING AND INSTALLING/REPLACING LEFT INTERMEDIATE LEVERS (N73) .
Remove right intermediate lever. Refer to 11 37 014 REMOVING AND INSTALLING/REPLACING RIGHT INTERMEDIATE LEVERS (N73) .
Remove left exhaust camshaft. Refer to 11 31 036 REMOVING AND INSTALLING/REPLACING LEFT EXHAUST CAMSHAFT (N73) .
Remove right exhaust camshaft. Refer to 11 31 038 REMOVING AND INSTALLING/REPLACING RIGHT EXHAUST CAMSHAFT (N73) .
Remove left cylinder head. Refer to 11 12 105 REMOVING AND INSTALLING LEFT CYLINDER HEAD (N73) .
Remove right cylinder head. Refer to 11 12 106 REMOVING AND INSTALLING RIGHT CYLINDER HEAD (N73) .

IMPORTANT: Used rocker arms may only be reused in the same position. Remove rocker arms of inlet camshaft and set aside in neat order.

Place bearing bracket with inlet camshaft and eccentric shaft as illustrated on special tool 11 9 470.

Illustrations show cylinders 7 to 12.

Fig 1: View Of Bracket With Inlet Camshaft And Eccentric Shaft On Special Tool

Courtesy of BMW OF NORTH AMERICA, INC.

Rocker arms (1) are now freely accessible.

Installation:

Rocker arm (1) is attached with a spring clamp on hydroelement.

Before installing bearing bracket, make sure rocker arms (1) are correctly positioned.

Observe rocker arm tolerance classes as illustrated (1 to 4).

IMPORTANT: Only rocker arms of the same tolerance class may be fitted in each cylinder on the inlet side.

Fig 2: Locating Rocker Arm Tolerance Class Marking

Courtesy of BMW OF NORTH AMERICA, INC.

Place cylinder head on special tool 11 9 000.

Press down special tool 11 9 014 valve spring.

Fig 3: Placing Cylinder Head On Expander Tool

Courtesy of BMW OF NORTH AMERICA, INC.

Special tool 11 0 346 old version.

Align special tool 11 0 346 in direction of valve shaft.

Fig 4: Attaching Valve Spring Cage

Courtesy of BMW OF NORTH AMERICA, INC.

Press down valve spring on spring cap from above and remove valve keys.

Fig 5: Removing Valve Keys

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IMPORTANT: Valve springs of exhaust and inlet camshafts are different. Incorrect installation is possible. Mixing up the valve springs will result in engine damage . Valve spring (1), inlet side. Valve spring (2), exhaust side. Valve spring (2), exhaust side, is approx. 4 mm longer.

Fig 6: Identifying Inlet And Exhaust Valve Spring

Courtesy of BMW OF NORTH AMERICA, INC.

Install valve springs so that larger diameter points to spring plate at bottom.

Only the diameter is decisive for the correct installation of the valve springs.

Color coding (1) is on lower end of valve spring.

Fig 7: Identifying Valve Spring Color Coding

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Arrangement:

Fig 8: Identifying Valve Components

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Assemble engine in reverse sequence to its disassembly.

Installation:

Clean all bearings and cams of inlet and exhaust camshafts and lubricate with engine oil.