Special tools required:
- 11 0 346. See 11 0 340 ACCESSORIES
- 11 9 000. See 11 9 000 CYLINDER HEAD EXPANDER TOOL
- 11 9 014. See 11 9 000 CYLINDER HEAD EXPANDER TOOL
- 11 9 470. See 11 9 470 SUPPORT
Necessary preliminary tasks:
- Remove left cylinder head cover. See 11 12 005 Removing and Installing/Sealing Left Cylinder Head Cover (N73)
- Remove right cylinder head cover. See 11 12 005 Removing and Installing/Sealing Left Cylinder Head Cover (N73)
- Remove inlet and exhaust adjustment unit on left side. See 11 36 047 Removing and installing/replacing inlet and exhaust VANOS on left side (N73)
- Remove inlet and exhaust adjustment unit on right side. See 11 36 048 Removing and installing/replacing inlet and exhaust VANOS on right side (N73)
- Remove left intermediate lever. See 11 37 012 Removing and Installing/Replacing Left Intermediate Levers (N73)
- Remove right intermediate lever. See 11 37 014 Removing and Installing/Replacing Right Intermediate Levers (N73)
- Remove left exhaust camshaft. See 11 31 036 Removing and Installing/Replacing Left Exhaust Camshaft (N73)
- Remove right exhaust camshaft. See 11 31 038 Removing and Installing/Replacing Right Exhaust Camshaft (N73)
- Remove left cylinder head. See 11 12 105 Removing and Installing Left Cylinder Head (N73)
- Remove right cylinder head. See 11 12 106 Removing and Installing Right Cylinder Head (N73)
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. See 11 9 470 SUPPORT
Illustrations show cylinders 7 to 12.
Rocker arms (1) are now freely accessible.
Installation:
Rocker arm (1) is attached with a spring clamp on hydro - element.
Before installing bearing bracket, make sure rocker arms (1) are correctly positioned.
Observe rocker arm tolerance classes as illustrated (1 to 4).
Place cylinder head on special tool 11 9 000. See 11 9 000 CYLINDER HEAD EXPANDER TOOL
Press down special tool 11 9 014 valve spring. See 11 9 000 CYLINDER HEAD EXPANDER TOOL
Special tool 11 0 346 old version. See 11 0 340 ACCESSORIES
Align special tool 11 0 346 in direction of valve shaft. . See11 0 340 ACCESSORIES
Press down valve spring on spring cap from above and remove valve keys.
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.
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.
Arrangement:
- Valve
- Valve stem seal with spring plate, bottom
- Valve spring
- Spring plate, top
- Valve keys
Assemble engine in reverse sequence to its disassembly.
Installation:
Clean all bearings and cams of inlet and exhaust camshafts and lubricate with engine oil.