Before reinstalling used rings or installing new rings, first clean the cylinder bore, position the ring deep inside the bore and measure the ring gap when at least 12mm (0.50 inch) from the bottom. Take a
Piston and insert it to square the ring in the bore, after which push it down and measure the end gap with a feeler gauge, exchanging any rings that are out of range. Check the ring grooves for dirt and scratches, (have them clean if necessary), put a snug feeler gauge between the ring and its land and only keep the rings that fit the specifications. Test if the ring moves freely with no binding by rotating it around the piston and be sure the No. 2 piston ring is correctly placed so the "Dot" mark is visible when seen from the top. To do so, place the oil ring expander, upper oil ring side rail, lower oil ring side rail, No. 2 intermediate piston ring and No. 1 upper piston ring, in sequence. First, set the oil ring expander, then place the upper side rail on one end between the piston ring and the expander ring, press it down and secure the lower side rail the same way. Fit the No. 2 intermediate piston ring using a piston ring installer and do the same to place the No. 1 upper piston ring. Give at least 45° between the piston ring end gaps and the expander ring gap, so the gap is not placed on the piston pin center or at its thrust position.