11
N73B60 Engine - Diagnosis
Cylinder Head - Preparation for Removal
• Rotate the engine and set up cylinder number 1 valve gear “timing” for
cylinder head removal, remove the VANOS solenoids, front cover and Bi-
VANOS units
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Valvetronic
The Valvetronic system simultaneously varies the valve opening time and the intake valve
opening lift between 0.3 mm and 9.85 mm, according to engine speed and load. This
means that the air volume is controlled according to engine requirements. The valve gear
is essentially the same as the N62 engine and has been adapted to the geometry of the
N73 (with two more cylinders).
1. Valvetronic motor
*
2. Intermediate shaft
*
3. Bridge support
*
4. Eccentric shaft
5. Torque compensation spring
*
6. Intake camshaft
7. Exhaust camshaft with “triple” cam
lobe for high pressure pump
*
** Modifications have been made to
these components making them
different from the N62.
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No
otte
e::
To remove the cylinder head,
it is necessary to remove the vari-
able valve gear and eccentric shaft
in order to gain access to the cylin-
der head bolts.
kt-9613
