Removing

Preliminary work for removing cylinder head

1. Remove exhaust manifold. Remove old seal.
2. Remove cylinder head cover.





3. Remove camshafts.

ATTENTION: Interchanged or dirty flat-base tappets.
^ Damage to engine components
^ The components have been run in the fitting bores in the housing, therefore do not interchange them.
^ Pay attention to cleanliness.

Note: There must be no visible signs of wear on the flat-base tappets and fitting bores of the flat-base tappet housing.

4. Remove the flat-based tappets. Pull each of the components out of the flat-base tappet housing using a strong magnet. Check running surfaces for signs of damage. To avoid confusing the individual flat-based tappets, lay them on a labeled, clean surface Example of laying aside flat-base tappets and cover them.





5. Remove flat-base tappet housing. Unscrew 11 Torx screws -1 -from the outside to the inside. Remove housing and check the fitting bores for damage.
6. Remove the old O-rings at the spark-plug recesses.

Removing cylinder head

ATTENTION: Damage due to ingress of dirt
^ Oil bores/oil ducts can become blocked up.
^ When working on the engine, absolute cleanliness is essential.
^ Lay removed engine parts on a clean base and cover them without fail.
^ Use the cover for dust protection when fitting the engine NR.165 on the engine assembly support.

Cylinder head 1-3:





1. Unscrew M6 threaded bolt (hexagon socket) for guide rail (flywheel side) -1-.





2. Unscrew four Torx screws with M6 x 30 captive washers (10.9) 1-4- at the chain slot. Use of a magnetic bit is recommended so that the screw to be fitted in the slot -item 4- cannot fall into the crankcase.
3. Loosen and unscrew 12 M1 0 Torx cylinder-head screws from outside to inside.
4. Carefully lift off the cylinder head and remove the old cylinder-head gasket.
5. Carefully clean the sealing faces on the cylinder head and crankcase (e.g. using a nylon brush and a clean, lint-free cloth soaked in acetone). Check the sealing face from cylinder head to crankcase for damage and cracks, and rework the flat surface if necessary.

The removal of cylinder head 4-6 is the same as for side 1-3 with the following change





^ The threaded bolt for guide rail 4-6 on the cylinder head (belt pulley side) -1 - is removed even before the camshaft timing gears are removed.