Withdrawal
Disconnect the ground wire from the battery.
Separate the breather hose from the cylinder head cover.
Where necessary, unscrew and remove the intake manifold bracket and, if installed, the sensor or idle air stabilizer bracket (disconnect the electrical connectors from the sensors and the stabilizer).
Where necessary, disconnect the airflow sensor electrical connector. Release the wiring harness from the brackets and move it to the side.
Where necessary, disconnect the pipes and hoses from the intake duct, then loosen the clamp and separate the duct from the throttle body. Remove the air filter housing mounting nuts and remove the housing along with the hose and airflow sensor.
Turn away fixing nuts of a valvate cover in a certain sequence.
Some engines have nine nuts/bolts. Additional (ninth bolt), located in the front of the cover near the ignition distributor, turns away last.
Where necessary, disconnect the spark plug wires from the distributor cap and move them to the side. It is usually not necessary to disconnect the wires from the spark plugs.
Remove the valve cover and gasket. Discard the old gasket, use a new one when installing. Where necessary, remove the camshaft cover. If installed, remove the semi-circular rubber seal from the slot on the front side of the cylinder head.
Installation
Using a scraper, scrape off the old sealant from the contact surfaces of the valve cover and cylinder head.
Caution: Be very careful not to scratch the surfaces. On sale there are special formulations that will greatly facilitate the task. After all traces of sealant have been removed, wipe the surfaces with a rag soaked in a suitable solvent.
Install a new semi-circular rubber seal in the slot on the front side of the cylinder head (if it is needed). Apply a special sealant to the contact surface of the valve cover gasket.
Caution: Within ten minutes of applying the sealant, install the valve cover and tighten the nuts.
Install the camshaft cover (some engines), valve cover and new gasket. Install washers and nuts, tighten nuts evenly and securely in reverse order shown (see fig. higher). Do not overtighten the nuts - they should not deform the valve cover.
Then install in the reverse order of removal.