Removing
1. Remove intake manifold (see related section).
Cover of the right head of the block of cylinders
2. Disconnect the wire ends from the spark plugs, then release the wires from the mounts and take them away from the cover.
3. Evenly and gradually loosen and remove the valve cover mounting bolts.
4. Remove the valve cover from the cylinder head and remove its seals and O-rings installed on the holes for the mounting bolts. Inspect all seals for damage and signs of wear and replace if necessary.
Left cylinder head cover
5. For easier access, remove the wiper arms and water deflector panel (see related section). Disconnect the wiring harness going to the engine, (see related section) and take it away from the lid.
6. On air-conditioned models, remove the A/C tube/hose bracket bolts from the front of the cylinder head and move the tube/hose to the side.
7. Lift the locking tab of the oil filler neck, then unscrew the neck counterclockwise and remove it from the cap (see illustrations). Throw away the O-ring - it must be replaced.
8. Remove the cover as described in points 3 and 4 (see illustration).
Installation
Cover of the right head of the block of cylinders
9. Make sure that the contact surfaces of the cover and cylinder block are clean and dry, then install the seals in the grooves of the cover. Place the O-rings in the grooves around each mounting bolt hole, seating them in a small amount of grease (see illustrations).
10. Apply a small amount of suitable sealant (Opel recommends composition 15 03 295) on the surface areas of the cylinder head near the front bearing caps of both camshafts, as well as on the edges of the semicircular openings in the rear of the head (see illustrations).
11. Carefully slide the valve cover into position, being careful not to dislodge the O-rings.
12. Install the cover fastening bolts and tighten them with the tightening force specified specifications, moving in a spiral from the center outward.
13. Install the wire lugs on the spark plugs and attach the wires with clips.
14. Install the intake manifold (see related section).
Left cylinder head cover
15. Install the cover as described in steps 9-12.
16. Install a new O-ring on the filler neck, then place the neck on the cap and secure it with the locking tongue.
17. Where necessary, install the air conditioning tube/hose bracket and tighten the mounting bolt securely.
18. Install the wiper motor cover and wiper arms as described in Section 12. Where necessary, connect the wiring harness to the engine.
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