GM 364704 PISTON, Engine Piston

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Prior to removing the piston and connecting rod assemblies, position the engine upright. Use a ridge reamer to completely eliminate the ridge at the top of each cylinder, following the manufacturer's instructions, as failing to do so may result in piston breakage. Once all cylinder wear ridges are removed, turn the engine upside-down. Before removing the connecting rods, check the endplay by mounting a dial indicator aligned with the crankshaft and touching the side of the number one cylinder connecting rod cap. Push the connecting rod forward to zero the dial indicator, then push it to the rear and note the reading; this distance indicates the endplay, which should not exceed the service limit, necessitating a new connecting rod if it does. Alternatively, use feeler gauges between the connecting rod and crankshaft throw to measure endplay. Check for identification marks on the connecting rods and caps, marking them if necessary. Loosen each connecting rod cap nut about half a turn, then remove the number one connecting rod cap and bearing insert without dropping the insert. To protect the crankshaft journal and cylinder wall, slip a short length of plastic or rubber hose over each connecting rod cap bolt before pushing the connecting rod/piston assembly out through the top of the engine, using a wooden tool to push on the upper bearing insert. If resistance is encountered, ensure all ridge material has been removed. Repeat this process for the remaining cylinders, and after removal, reassemble the connecting rod caps and bearing inserts in their respective rods, installing the cap nuts finger tight to prevent accidental damage to the bearing surfaces.

With the notch on top of the piston facing the front of the engine, gently place the piston/connecting rod assembly into the number one cylinder bore, resting the bottom edge of the ring compressor on the engine block, and tap the top edge to ensure contact around the circumference.

Twisting the piston and rod in opposite directions, with noticeable play indicating excessive wear that must be corrected, potentially requiring the piston/connecting rod assemblies to be taken to an automotive machine shop for new piston pins and rebore.