Version 1
Size (1) 55.2 mm
Necessary preliminary tasks:
- Remove CYLINDER HEAD COVER
If necessary, move eccentric shaft (1) on twin surface to minimum lift (2).
Secure special tool 11 4 270 to gate (2) using locking pliers (3).
The position of the locking pliers (3) on the special tool 11 4 270 must not be altered. Risk of damage!
Secure both bearing pins (2) in torsion springs with knurled screw (1) of special tool 11 4 270.
Press special tool 11 4 270 to stop in direction of arrow.
Release steel screw (2).
To avoid jamming with screw (2) and return spring, it is necessary when releasing screw (2) to relieve the preload on special tool 11 4 270 uniformly.
Tightening torque: 10 Nm
Relieve tension on return spring (1) with special tool 11 4 270.
Installation note:
Replace metal tab if tab washer is defective.
Press return spring apart at position (1) and remove towards top.
All components must be set down in a clean and orderly fashion.
All components must be reinstalled in the same positions in an engine which has already been in use.
- Eccentric shaft with bearing
- Bearing caps of eccentric shaft (set out in order)
- Intake camshaft
- Bearing caps of intake camshaft (set out in order)
- Intake valves with valve springs
- Valve heads and valve keys
- Roller cam followers with hydraulic valve clearance compensating element (set out in order)
- Return springs.
- Gates (set out in order)
- Intermediate levers (set out in order)
Release screws (1).
Tightening torque: 10 Nm
Set down gates (2) in special tool 11 4 481 in neat order.
Installation note:
Mixing up the gates may cause the engine to demonstrate idle fluctuations.
This will result in maladjustment of uniform distribution .
Installation note:
Contact surfaces (1) must be clean and free from oil and grease. If necessary, clean contact surfaces.
Lift out intermediate levers (2).
Place all intermediate levers (2) in neat order in special tool 11 4 481.
Installation note:
Mixing up the intermediate levers may cause the engine to demonstrate RPM fluctuations.
Installation note:
Contact surfaces (1) must be clean and free from oil and grease. If necessary, clean contact surfaces.
All intermediate levers (1) are classified.
Reinstall intermediate levers which have already been used in the same positions.
Install intermediate levers (2).
Fit gate (2) cleanly into opening.
Tighten screws (1) hand-tight.
Check both intermediate levers again to ensure correct installation position.
Release bolts (1) again by a 1/4 turn.
Secure special tool 11 4 450 to screw fixing (1) of eccentric shaft.
Move eccentric lever (3) on special tool 11 4 450 in direction of arrow.
Gate is now pretensioned.
Secure screws (2).
Tightening torque: 10 Nm
Installation note:
At cylinder no. 3, the gate can be pre-installed with one bolt (2) only.
Fit oil spray nozzle only after retaining spring has been fitted.
Fit return spring on gate.
Installation note:
Insert return spring (2) in intermediate lever (1) (see arrow).
Check roller cam follower (3) again to ensure correct installation position.
Secure special tool 11 4 270 to gate (2) using locking pliers (3).
Adjusting the locking pliers (3) is not permitted (risk of damage) on special tool 11 4 270.
Secure both bearing pins (2) in return spring with knurled screw (1) on special tool 11 4 270.
Insert steel screw (2).
Tightening torque: 10 Nm
To avoid jamming with screw (2) and return spring, it is necessary when inserting screw (2) to increase the preload on special tool 11 4 270 uniformly.
Tightening torque: 10 Nm
Remove special tool 11 4 270.
At cylinder no. 3, adjust oil spray nozzle (2) so that oil spray (3) points precisely towards gearing.
Insert screw (1) with oil spray nozzle (2) (external).
Tightening torque: 9 Nm
Assemble engine.