4-70CONNECTING RODS AND PISTONS ENGNOTE:NOTE:e. Calculate the piston-to-cylinder clearancewith the following formula.Piston-to-cylinder clearance =Cylinder bore “C” –Piston skirt diameter “P”Piston-to-cylinder clearance0.025 0.045 mm: 0.07 mmf. If out of specification, replace the crank-cases, and the pistons and piston rings as aset.EAS00263CHECKING THE PISTON RINGS1. Measure: piston ring side clearanceOut of specification Replace the pistonand piston rings as a set.Before measuring the piston ring side clear-ance, eliminate any carbon deposits from thepiston ring grooves and piston rings.Piston ring side clearanceTop ring0.030 0.065 mm: 0.115 mm2nd ring0.020 0.055 mm: 0.115 mm2. Install: piston ring(into the cylinder)Level the piston ring in the cylinder with the pis-ton crown.a 5 mm
