Ford 2003 Mustang Workshop Manual page 1252

36. Remove the oil level indicator tube.
Both cylinder heads
37. Clean and inspect the exhaust manifolds. For additional information, refer to
38. CAUTION: Do not use metal scrapers, wire brushes, power abrasive discs or other
abrasive means to clean the sealing surfaces. These tools cause scratches and gouges
which make leak paths. Use a plastic scraping tool to remove all traces of old sealant.
NOTE: The bolts are part of the valve cover and should not be removed. RH valve cover
shown, LH valve cover similar.
Remove the RH and LH valve covers.
Fully loosen the bolts and remove the valve covers.
Clean the valve cover mating surface of the cylinder heads with silicone gasket remover
and metal surface prep. Follow the directions on the packaging.
Inspect the valve cover gasket(s). If the gasket(s) is damaged, remove and discard the
gasket(s). Clean the valve cover gasket groove(s) with soap and water or a suitable
solvent.
Section 303-00 .