GM 96067711 Piston Set, Os:050

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It is important to check for ridges in the cylinder because carbon deposits or cylinder wear can produce ridges at the upper limit of ring travel. These ridges must be completely removed before attempting to remove the piston/connecting rod assemblies to avoid piston breakage.

Before installing the piston/connecting rod assemblies, ensure that the cylinder walls are clean and the top edge of each cylinder is chamfered. The crankshaft must also be in place. Remove the cap from the end of the number one connecting rod and wipe the bearing surfaces of the connecting rod and cap with a clean cloth. Clean the backside of the new upper bearing insert and lay it in place in the connecting rod, making sure the tab on the bearing fits into the recess in the rod. Clean the backside of the other bearing insert and install it in the rod cap, ensuring the tab on the bearing fits into the recess in the cap. Position the piston ring gaps around the piston and lubricate the piston and rings with clean engine oil. Attach a piston ring compressor to the piston and compress the rings until they're flush with the piston. Rotate the crankshaft until the number one connecting rod journal is at bottom dead center and apply a coat of engine oil to the cylinder walls. Match the pistons to the cylinders and gently insert the piston/connecting rod assembly into the number one cylinder bore. Tap the top of the piston with a wooden or plastic hammer handle while guiding the connecting rod into place on the crankshaft journal. Once the piston/connecting rod assembly is installed, check the connecting rod bearing oil clearance using Plastigage. Clean the Plastigage material off the rod journal or bearing face and apply a layer of clean moly-base grease or engine assembly lube to both of them. Slide the connecting rod back into place on the journal, install the rod cap, and tighten the nuts to the specified torque. Repeat the procedure for the remaining pistons/connecting rods. After installation, rotate the crankshaft by hand to check for any binding and check the connecting rod endplay. Finally, install the remaining components in the reverse order of removal.

During the inspection, each piston should be checked for cracks around the skirt, pin bosses, and ring lands. Scoring, scuffing, holes in the piston crown, and burned areas at the crown's edge should also be noted.