Before inserting the ring, clean the cylinder bore; then, put in the ring and press it down with the
Piston for a square fit. Try to measure the ring gap with a feeler gauge at least 12 mm (0.50 in.) from the bottom of the cylinder bore, as the ring is placed. The following step is to inspect the width between the outer ring and the groove in the cylinder block. To take out the piston and rod, remove the connecting rod and piston, then apply a ring expander tool to eject No. 1 and No. 2 piston rings, the upper oil ring side rail, lower oil side rail and both ends of the oil ring expander. Before installation, double-check how much space remains between the cylinder bore, piston and piston rings. The manufacturers determine the placement of the No. 2 ring by its I.D. dot (dot on the top). Place the piston rings in the engine from the following top to bottom: oil ring expander, upper oil ring side rail, lower oil ring side rail, No. 2 intermediate piston ring and No. 1 upper piston ring. For the side rail installation, place one end between the piston ring groove and the expander, grip firmly and push down enough to place the side rail in position without the piston ring expander. Begin by setting up the upper rail; after, fit the lower rail next and then add the No. 2 and No. 1 piston rings. Make sure the piston ring end gaps are in place and that the oil ring expander gap is at least 45° over from the side rail gaps, not on the piston pin center or in the thrust direction, as fins should be staggered to control oil properly.