For 1990-2009 cars

1. Unclip and remove the intake rocker arms (1) from the rocker arm shaft.
2. Remove the 6 rocker arm shaft bolts (1).
3. Slide the camshaft towards the rear of the cylinder head to access the rocker arm shaft O-ring seal.
4. Remove the rocker arm shaft O-ring seal.
5. Carefully slide the rocker arm shaft out of the cylinder head while removing the exhaust rocker arms (1) and springs from the rocker arm shaft.