1995 Johnson Evinrude "EO" 60 LV 90, 115, 150, 150C, 175 Service Manual, P/N 503151, Page 145Get this manual
1517Measure each cylinder in at least two areas as shownEach The cylinder must not be out-of-round by more than 0.004 in(0,10 mm)
area should be measured twiceThe difference between the two measurements in each area is the cylinder out-of-round dimension
1sl8The dimension difference between the two areas is cylinder taper The cylinder taper must not exceed 0.002 in(0,05 mm)1sl9The difference between your measurements and standard bore dimension is cylinder oversizeRefer to Engine Specifications, Section 1, for dimensions The cylinder must not be oversized by more than 0.004 in(0,10 mm)If any cylinder is outside these tolerances, it must be bored oversizeIt is permissible to have one or more oversize pistons in an engineRefer to Engine Specifications, Section 1f6110Use micrometer to check piston conditionMake at least two measurements, 90 from each otherMeasure the piston diameter V4 in(6,4 mm) above the bottom edge of the piston skirt The difference between the two piston measurements must not exceed 0.003 in(0,08 mm)rJl11For the new 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 the ring end gap The ring end gap must be within 0.011-0.023 in(0,280,58 mm)1s112Use machinist's straightedge to check clearance on the tapered ringsInstall one tapered ring in the piston's upper ring grooveWhen checked with the straightedge, there should be enough ring clearance to allow the straightedge to touch the piston on both sides of the ring grooveMake several checks around the piston If straightedge does not touch piston, remove the ring and clean ring grooveRemove upper ring from pistonInstall remaining tapered ring in piston's lower ring groove and check for clearance