Mercury XR3Z-6108-JA Piston And Pin Assembly

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Before installing piston/connecting rod assemblies, ensure clean cylinder walls, chamfered top edge of each cylinder, and crankshaft in place. Remove cap from end of number one connecting rod, wipe original bearing inserts' surfaces. Place upper and lower bearing inserts in connecting rod and cap, align tabs. Position piston ring gaps, lubricate piston and rings with oil. Use ring compressor to insert assembly into number one cylinder bore, tap piston into place, guide connecting rod onto crankshaft journal. Check connecting rod bearing oil clearance with Plastigage before bolting rod cap. Tighten nuts to specified torque, check Plastigage for oil clearance, scrape off traces if correct. Apply moly-base grease or assembly lube to bearing faces, slide connecting rod back into place. Repeat procedure for remaining pistons/connecting rods. Rotate crankshaft to check for binding, verify connecting rod endplay, resize rods if necessary at machine shop.

Employ a piston ring groove cleaning tool or a section of a broken ring to clear carbon deposits from the ring grooves without damaging the metal.

You should check for ridges at the upper limit of ring travel using your fingernail.