Image E - relates to plastic gasket ring in image "B"
Above is a tip for Ford 4.0 liter engine - oil pan gasket problems. Relates to image "B"

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 pick-ups. 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 leak. 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 installation. The pictures on the other 5 pages give a closer look at the main cap and the corner cavities. For any questions about these tips just give us a call.

Canada Engines photo 4 Ford 4liter 1990-1993 engine oil pan drawing - relates to image "B"