1994 Johnson Evinrude "ER" 90 LV 120 thru 140, 185 thru 225, 250, 300 Service Manual P/N 500612, Page 207Get this manual

1994 Johnson Evinrude "ER" 90 LV 120 thru 140, 185 thru 225, 250, 300 Service Manual P/N 500612, Page 207

134 110Use micrometer to check piston conditionMake at least two measurements, 90 from each otherMeasure the piston diameter
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)1371 13Use machinist's straightedge to check
clearance on tapered piston ring The upper ring is tapered on V4 and V8 modelsboth rings are tapered on V6 modelsWhen 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