Removing
Preliminary work for removing cylinder head cover1. Remove engine.
2. Remove rear muffler.
Removing cylinder head cover - engine removed
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.
Note: Replace the O-ring on the oil suction pump (tandem pump).
Cylinder row 1-3:
1. Remove cover plate for ignition coils -1 -. Unscrew two M6 x 16 Torx screws and remove cover plate.
2. Remove holder for rear muffler -2-. Pull off cable plug for ignition coil cylinder 2 (side 4-6 cylinder 5) and cable plug for solenoid hydraulic valves. Unscrew the four Torx screws: intake side, two M8 x 30, exhaust side, two M8 x 25, remove support.
3. Remove ignition coils -1-. Pull off remaining ignition coil cable plugs. Unscrew two M6 x 25 Torx socket screws, pull the ignition coils out of the spark-plug recess.
4. Remove support and retainer plates (with integrated seal) for the solenoid hydraulic valves (camshaft timing and valve lift control) -2-, Removing hydraulic valve for camshaft timing and Removing hydraulic valve for valve lift control. If the valves do not have to be replaced, these can remain in the cylinder head (side 1-3 both, side 4-6 camshaft timing only)
5. If the solenoid hydraulic valve is removed for camshaft timing, the oil strainer -1- must be checked for damage and contamination, and replaced if necessary.
6. Remove oil suction pump. Unscrew four M6 x 20 Torx screws (micro-self-locking), remove oil suction pump, replace O-ring and screws.
ATTENTION: Damage when levering off the cylinder head cover
^ Cast lugs could break.
^ Perform work steps carefully and gently.
Note: The coated screws for the bearing surfaces of the camshaft in the cylinder head cover must be replaced when installing.
7. Remove the cylinder head cover . Unscrew 20 M6 x 30 Torx screws from the cylinder head cover. To loosen the cylinder head cover, raise the cover carefully at the two protruding cast edges with a screw driver or mounting lever. Remove cylinder head cover.
8. Remove the plastic cap.
Note: Make sure that it is cleaned thoroughly and that residual sealing compound is removed completely. Even the smallest particles can block up oil bores.
9. Clean the sealing faces on the cylinder head cover and cylinder head thoroughly (use brass - or nylon brush, a clean and lint-free cloth soaked in acetone). All residual sealing compound in the cylinder head and on the cover must be removed before assembling.
Additional work steps on the cylinder row 4-6:
^ Loosen ground cable on the cylinder head, to do this, unscrew on M8 Torx screw and remove the cable.
^ Unplug two cable plugs for the oil pressure switch.
^ A tandem pump is installed on side 4-6 instead of the oil suction pump. Pull off the vacuum line on the pump. Replace O-rings and micro-self-locking screws.
^ Because of the small distance to the exhaust manifold, the valve lift control valve must be removed, so that the cover can be removed and installed without difficulty. Pay attention to the spring element.