Sequence of execution
1. Prepare the car for work (see "Preparing the car for maintenance and repair").
2. Remove the decorative engine cover (see "Engine trim panel - removal and installation").
3. Using pliers, squeeze the clamp and disconnect the hose supplying crankcase gases to the throttle body space.
4. In a similar manner, disconnect the hose supplying crankcase gases to the space in front of the throttle valve.
5. Disconnect the wiring harness connector from the coolant temperature sensor (see "Coolant Temperature Sensor - Checking and Replacing").
6. Using a TORX E10 key, unscrew the bolt securing the coolant supply line to the throttle assembly, located on the intake manifold.
7. Using the same wrench, unscrew the bolt securing the line to the cylinder head cover.
8. Use pliers to squeeze the clamp and disconnect the line; a small amount of coolant may spill out.
9. Remove the ignition module (see "Ignition module - checking and replacement").
10. Using the TORX E10 key, unscrew the ten bolts securing the cylinder head cover.
11. Pull up and remove the cylinder head cover.
12. Remove the gasket from the grooves in the cylinder head cover.
13. Clean the mating surfaces of the cylinder head and cover from old sealant and gasket residue.
Warning! Use only special sealant for vehicles equipped with oxygen sensors in the exhaust system. Using a regular sealant (with a high silicone content) may cause the sensors to fail.
14. Install the parts in the reverse order. Before installing the cover, apply a thin layer of sealant to the front camshaft bearing covers.
15. Check and, if necessary, top up the coolant level to normal.
(Material was taken from a resource: «opelbook.ru»)
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