I assume this is an XLT. The purple head cover is only a cover the actual head is under the purple cover. There is an outer o-ring and then 3 small o-rings that seal where the spark plug hole comes up out of the head cover. Just need to remove the cover and go to the dealer and get all new o-rings to reseal it. See the attached picture showing the bolt torque and the o-ring with a shim and some sealant