Before the piston and connecting rod assemblies are to be removed there are two major parts that are to be removed and they are cylinder head and oil pan. Insert your fingernail and look for any ridge at the upper limit of ring travel, which is approximately 1/4 inch down from the top of each cylinder; if there are ridges, they must be shlaped is carbon has deposited and worn into the cylinders with a ridge reamer due to the fact that it could cause piston breakage. After flattening the ridges turn the engine over so that the
Crankshaft is in the vertical position. Feel the end float of connecting rods with the help of feeler gauges; if the play exceeds the maximum rate, then new connecting rods may be required. Marking of the connecting rods and the caps should be done in such a way that one cannot be confused with the other. Tighten the connecting rod cap bolts progressively and uniformly, remove the cap and without letting the bearing insert drop, push the connecting rod / piston out from the top of the engine. Perform this again to the other cylinders and then replace the caps and inserts to cover not to harm them. Regarding the piston rings, measure the ring end gaps and make sure that the side clearance of the piston ring is appropriate. Locate or align the piston/connecting rod assemblies with the new ring sets, install the top ring into the first cylinder, and use the scribe-and-feeler gauges to set the end gap. If the gap is too large or too small adjust it as needed making sure not to be too forceful. Place the oil control ring followed by the middle and then the top ring with the correct orientation. It is recommended to wash the cylinder walls, sharpen the edges of the cylinder and have the crankshaft installed before installing the assemblies. Scrub the journal and bearing faces, place the new upper bearing insert, and make sure there is a snap fit without any grease. Place the gaps of the piston ring in the correct manner, apply oil to the piston as well as the rings and use a piston ring compressor for this process. After scraping the connecting rod bearing with Clean Cloth, use Plastigage to measure the oil clearance of bearing across the surfaces to mach mark. When attempting to determine the clearance, it should be noted that if the clearance is low then there could be incorrect bearing size problem or there could be some problem with the journal. Last but not the least, remove all the Plastigage deposits, coat the bearing faces with grease and put the rod cap with new nuts and bolted it with the recommended torque. The process is then continued on the other assemblies, with special attention paid to cleanliness and orientation of the components. After installation, using the special tool rotate the crankshaft to check the binding, and use a feeler blade to check the connecting rod end play once more and adjusting it if needed.