Chevrolet 12686358 Piston Assembly, (W/ Pin & Cmprn & Oil Ring)(Lh)

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Before the piston and connecting rod assemblies are to be removed, it is necessary to unbolt and remove the cylinder head and oil pan. If there is any ridge at the top end of ring motion, indicate it by using a fingernail: the ridge should be reamed off using a ridge reamer if necessary as instructed by the manufacturer. Label each piston with a number and an arrow pointing forward of the engine facing with caution at the connecting rod bearing. Once all the cylinder ridges have been removed, position the engine in such a manner that the crankshaft is positioned upwards and then measure the end play of the connecting rod using feeler gauges to ensure that it alighted to the correct limit. If not already done so, apply a serial number to the connecting rods and the caps. Unclench the connecting rod cap bolts gradually and take out the cap and the bearing insert in the manner of no dropping. Remove the connecting rod and piston assembly by FAGGING it out through the top of the engine block if possible, or using a hammer handle if required. Do the same for the other cylinders; connect the caps and inserts tightly not to harm them in the process. New bearing inserts are to be fitted to V6 engines. It is very important, before fitting new piston rings, to measure the ring end gaps and to make sure that the side clearance for the piston rings is correct. Place the new ring sets on the piston and connecting rods and place the top ring into the first cylinder and place feeler gauges in the end gap. If it is off when completed, then subject it with finesse to a thin file. First to be set in place is the oil control ring, the middle and the top rings should be place in the right direction. Open the cylinder heads and clean the cylinder walls and use a file to chamfer the edges, also ensure that the crankshaft is sliding before fixing the piston/connecting rod assemblies. Remove all bearing accessories and debris and add and replace the premium upper and lower bearing inserts without the use of any lubricant. On cylinder block, locate the piston ring gaps equally at 90-degree intervals, before lubricating the piston and rings and then using a ring compressor to install the piston into the cylinder. It is recommended to use Plastigage to inspect the Oil Clearance for the connecting rod bearing and inspect the size and condition of the bearing inserts. Once installed remove any Plastigage material by scraping over the surface, reapply oil to the bearing faces and fit the rod cap, new bolts are used and tightened to the recommended torque. The same procedure shall be followed with the other assemblies completing the entire process fresh and well aligned as possible. Last, turn the crankshaft to feel for any binding and to be sure that the connecting rod has the correct endplay, then make corrections.

Clean the cylinder walls and chamfer the top edge of each cylinder bore, then lubricate the piston and rings.

Ensure cleanliness and correct orientation throughout the process.

Use a piston ring compressor for installation.