Removing
Preliminary work for removing cylinder head cover1. Remove engine.
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: The coated screws for the bearing surfaces of the camshaft in the cylinder head cover must be replaced when installing.
Note: Replace the O-ring on the oil suction pump (tandem pump).
Cylinder row 1-3:
1. Disconnect oil pressure switch cable plug.
2. Disconnect and remove cable plugs for ignition coils. Remove ignition coils -1 -;to do this, unscrew each of the two Torx screws (M6 x 25) and remove the ignition coils from the spark-plug recess.
3. Unscrew both Torx screws (M6 x 20). Remove support and retainer plate (with integrated seal). Pull solenoid hydraulic valves -2- for camshaft timing out of the bores if these need to be replaced. Replace retainer plate (with integrated seal) during installation.
4. If the solenoid hydraulic valve is removed for camshaft timing, the oil strainer -l- must be checked for damage and contamination, and replaced if necessary.
5. Remove oil suction pump 1 - 3. Unscrew four M6 x 20 Torx screws (micro-self-locking), remove oil suction pump, replace O-ring and screws.
6. Unclip oxygen sensor line from the brackets.
ATTENTION: Damage when levering off the cylinder head cover
^ Cast lugs could break.
^ Perform work steps carefully and gently.
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 a 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:
A tandem pump is installed on side 4-6 instead of the oil suction pump. Pull off the vacuum line on the pump -2-. Replace O-ring and micro-self-locking screws -1-.