Chevrolet 91177382 Piston Kit,Os:050 (On Esn)

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After the piston/connecting rod assembly is installed in the cylinder, the connecting rod bearing oil clearance should be checked using Plastigage.

Before proceeding with the inspection process, it's essential to clean the piston/connecting rod assemblies and remove the original piston rings. It's imperative to use new piston rings when reassembling the engine. Using a piston ring installation tool, cautiously remove the rings from the pistons, taking care not to damage the pistons. Carbon deposits on the piston tops should be scraped off, with the option to use a hand-held wire brush or fine emery cloth once the majority of deposits are cleared. Avoid using a wire brush in a drill motor as it may erode the soft piston material. Employ a piston ring groove cleaning tool or a section of a broken old ring to eliminate carbon deposits from the ring grooves, ensuring no metal removal or damage to the groove sides. After deposit removal, clean the piston/rod assemblies with solvent and dry them using compressed air, ensuring clear oil return holes in the ring grooves' back sides. If the pistons and cylinder walls aren't significantly damaged or excessively worn, and the engine block doesn't require reboring, new pistons may not be necessary; however, always use new piston rings when rebuilding the engine. Thoroughly inspect each piston for cracks around the skirt, pin bosses, and ring lands. Look for scoring, scuffing on the skirt's thrust faces, holes in the piston crown, and burned areas at the crown's edge, indicating potential overheating or abnormal combustion issues. Address causes like intake air leaks, incorrect fuel/air mixture, timing discrepancies, or EGR system malfunctions. Corrosion in the form of small pits suggests coolant leakage into the combustion chamber or crankcase, necessitating corrective action. Measure piston ring side clearance and piston-to-bore clearance to ensure they are within specifications. Verify piston-to-rod clearance and consult an automotive machine shop if necessary. If piston removal from connecting rods is required, consult an automotive machine shop. Inspect connecting rods for cracks and damage, and temporarily remove rod caps to inspect bearing surfaces for nicks, gouges, and scratches, replacing old bearings if the engine is rebuilt due to a connecting rod knock, ensuring the installation of new rods if necessary.

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.