The 4.0L Ford V6 has been a problem engine for
oil leaks for years.
This engine in used in the Aerostar, Explorer and Ranger
The most common leak is often diagnosed as a rear seal
leak, but in almost every case we've seen, the problem
is later found to be the rear of the oil pan gasket.
Since 1990, when the 4.0L was first introduced, Ford
redesigned the gasket twice and even the oil pan casting
to eliminate the leaking issue.
We've come up with a few installation tips for our customers,
to prevent this costly and aggravating oil pan gasket
The '90 to '93 gasket set will include a plastic wedge
seal that goes into a groove in the main cap. This
diagram explains the steps to take for a successful
The pictures below give a closer look at the main cap
and the corner cavities. For any questions about these
tips just give us a call.