Ford Repair Questions? Ask a Mechanic for Answers ASAP
The timing cover will not allow coolant into the oil. Coolant does not pass through the timing cover on a 4.6L. The engine that had troubles was the 6.8L V10. The coolant passage on the earlier ones near the front of the drivers head would corrode away and cause an external coolant leak but that has since been fixed.
Yours is from a bad head gasket.