Ford 2003 Mustang Workshop Manual page 1571

58. Lubricate the front oil seal and the engine front cover with clean engine oil.
59. Using the special tools, install the front oil seal.
60. NOTE: If the crankshaft pulley is not installed within four minutes, the sealant must be removed
and the sealing area cleaned with metal surface cleaner. Allow to dry until there is no sign of
wetness, or four minutes, whichever is longer. Failure to follow this procedure can result in
future oil leakage.
Apply silicone gasket and sealant to the Woodruff key on the crankshaft pulley.
61. Using the special tool, install the crankshaft pulley.