need the diagram or schematic to replace a cat converter on a 1993 ford explorer sport 4 x 4 4.0 litre.

The catalytic converter is just a blt on item whereby you remove bolts and take it out, a straight forward job but the partt is rather costly, in fact the most expensive of the items listed. Sorry I could not find any diagrams in our database. Will try other sources to see if I can get any for you.

The price listed seems reasonable considering the parts and jobs being performed.

Item # 3 is the catalytic converter.
Removal

Remove the two nuts and two bolts (spring assembly) attaching converter pipe assembly to muffler and outlet pipe.
Loosen and remove the three nuts that connect the converter to Y-pipe assembly. Swing the muffler and outlet pipe to the rear, and then remove the converter and gaskets, disengaging rod from insulator.
Loosen and remove the exhaust manifold-to-inlet pipe bolts. Move the inlet pipe rearward, rotate to clear studs and remove.

Installation

Install inlet pipe onto exhaust manifold and loosely secure in place with retaining bolts.
Position converter assembly in place, engaging rod into insulator.
Install a new non-asbestos gasket between the converter and muffler/outlet pipe assemblies. Secure the flange gasket and flanges with two bolts (spring assembly) and two nuts. Tighten to 34-46 Nm (25-34 ft-lb).
Install a new non-asbestos gasket between the converter and Y-pipe. Secure with three nuts and tighten to 34-46 Nm (25-34 ft-lb).
Tighten exhaust manifold connections by alternately tightening the manifold nuts to 34-46 Nm (25-34 ft-lb).