1994 Johnson/Evinrude "ER" 60 thru 70 outboards Service Manual, Page 154Get this manual
'sl 9Use micrometer to check piston conditionMake at least two measurements, 90 from each otherMeasure the piston diameter 14 in(6,4 mm) above the bottom edgeRefer to Engine Specifications, Section 1, for piston dimensions The difference between the two piston measurements must not exceed 0.003 in(0,08 mm)rJl 10For new or used ring sets, make the following inspectionsPlace each ring, separately, in its respective boreUse piston to square the ring in the cylinderUse feeler gauge to measure he ring end gap The ring end gap must be within 0.007-0.017 in(0,130,46 mm)f81 11Use feeler gauge to check groove side clearance on the lower, square ringsInstall each square ring on its pistonWith the ring seated in its groove, make several checks around the piston The side clearance must not exceed 0.004 in(0,10 mm) - --:-:-=-'