Before fitting the new piston rings, measure the ring ends and fine the right size for piston ring groove clearance. LIST: Piston/connecting rod assemblies, new ring sets, piston, and cylinder must be laid down so that the corresponding piston and cylinder can be compared during end gap measurement and subsequent assembly of the engine. Place the first ring with the land of the ring touching the cylinder's side wall, and insert it into cylinder, using the top of the piston, which should be near the bottom of the cylinder. To determine the end clearance, set the feeler gauges in between the ends of the ring until it comes to the correct gauge width where it runs with slight friction. If the gap is too small one can conveniently replace the rings without filing the end. End gap is not a factor unless it is greater than approximately 0.040-inch so double-check the rings for the engine. You should do this for every ring in the first cylinder and the remaining cylinders, always trying to pair them sufficiently: rings, pistons, cylinders. After that checks the gap of the ring end and adjustments needs to be made, the rings have to be fitted to the pistons, the first one is the oil control ring which comprises of three rings. Place the spacer/expander into the groove with the anti-rotation tang, if used, in position and then set the lower side rail in place; it is not necessary to use a piston ring installation tool at this time as it can damage the part. For the upper side rail do the same and make sure both can move freely in the grove. Subsequently, the middle ring which indeed has the identification mark facing upwards should be clipped in the same manner into the middle groove using the piston ring installation tool. Last, fit the top ring in the same manner and aligning the mark in upward position and similarly continue the process with all the pistons and rings.