Mercury 2L2Z-6108-NA Piston And Pin Assembly

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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.

Before removing the main bearing cap assembly and connecting rods, check the connecting rod endplay with feeler gauges. Slide them between the first connecting rod and the crankshaft throw until the play is removed. Repeat this for each connecting rod. The endplay should measure between 0.005 to 0.015 inch (0.127 to 0.381 mm). If it exceeds this limit, new connecting rods will be required.

Tap the top edge of the ring compressor to make sure it's contacting the block around its entire circumference.

After the cylinder ridges have been removed, turn the engine upside-down so the crankshaft is facing up.

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.

Carefully scrape all traces of the Plastigage material off the rod journal or bearing face using a fingernail or the edge of a credit card.

Carefully inspect each piston for cracks around the skirt, at the pin bosses, and at the ring lands.

Rotate the crankshaft a number of times by hand to check for any obvious binding.

Remove the connecting rod cap and bearing insert together, being careful not to drop the bearing insert out of the cap.

Each piston should be carefully inspected for cracks around the skirt, at the pin bosses, and at the ring lands.