Ford 4L2Z-6100-AA Piston And Connecting Rod Assy

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The ring end gaps must be checked.

Clean the back side of the new upper bearing insert, then lay it in place in the connecting rod. Make sure the tab on the bearing fits into the recess in the rod. Do not hammer the bearing insert into place and be very careful not to nick or gouge the bearing face. Do not lubricate the bearing at this time.

After removal, reassemble the connecting rod caps and bearing inserts in their respective connecting rods and install the cap nuts finger tight. Leaving the old bearing inserts in place until reassembly will help prevent the connecting rod bearing surfaces from being accidentally nicked or gouged.

A piston ring installation tool should be used to carefully remove the rings from the pistons, ensuring not to nick or gouge the pistons in the process.

Cut a piece of the appropriate size Plastigage, lay it on the number one connecting rod journal, clean the connecting rod cap bearing face, and install the rod cap. Then, compare the width of the crushed Plastigage to the scale printed on the Plastigage envelope.

Remove the bearing insert and push the connecting rod/piston assembly out through the top of the engine using a wooden hammer handle to push on the upper bearing surface in the connecting rod. If resistance is felt, double-check to ensure that all of the ridge was removed from the cylinder.

Check the connecting rods for cracks and other damage. Temporarily remove the rod caps, lift out the old bearing inserts, wipe the rod and cap bearing surfaces clean, and inspect them for nicks, gouges, and scratches. After checking the rods, replace the old bearings, slip the caps into place, and tighten the nuts finger tight. Note: If the engine is being rebuilt because of a connecting rod knock, be sure to install new rods.

Corrosion of the piston, in the form of small pits, indicates that coolant is leaking into the combustion chamber or the crankcase. The cause must be corrected to prevent the problem from persisting in the rebuilt engine.

The cylinder walls must be perfectly clean, the top edge of each cylinder must be chamfered, and the crankshaft must be in place.

Remove the bearing insert and push the connecting rod/piston assembly out through the top of the engine. Use a wooden or plastic hammer handle to push on the upper bearing surface in the connecting rod. If resistance is felt, double-check to make sure that all of the ridge was removed from the cylinder.