GM 14092910 Piston & Piston Pinion Assembly, (Std)

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 failure to do so may result in piston breakage. Once the cylinder wear ridges are removed, turn the engine upside-down. Before removing the connecting rods, check the end play by mounting a dial indicator aligned with the crankshaft and touching the side of the number one connecting rod cap. Push the connecting rod backward to zero the dial indicator, then push it forward to check the reading; the distance moved indicates the end play, and if it exceeds the service limit, a new connecting rod is necessary. Alternatively, feeler gauges can be used to measure the end play by inserting them between the connecting rod and crankshaft throw until the play is eliminated, with the total thickness equating to the end play. Inspect the connecting rods and caps for identification marks; if absent, use a small punch to create indentations for identification. Loosen each connecting rod cap nut about half a turn, remove the number one connecting rod cap and bearing insert without dropping the insert, and protect the crankshaft journal and cylinder wall by slipping short lengths of plastic or rubber hose over the connecting rod cap bolts before pushing the connecting rod/piston assembly out through the top of the engine with a wooden tool. If resistance is encountered, ensure all ridge material has been removed from the cylinder. 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.