1991 Johnson/Evinrude EI Outboards 2.3 thru 8 Service Manual, Page 144Get this manual
oC03082
151 9Take piston diameter measurement Va in(3 mm) above the
bottom edge of the piston1sl 10Take at least two measurementsThe first measurement should be in line with the wrist pin bore
71 1.1The second measurement should be 90 away from the
l.J first12The difference between the two measurements is the out-ofroundness and must be no more than 0.002 in(0,05 mm)13Refer to Engine Specifications, Section for piston dimensions'8l 14Place each ring, separately, in it respective boreUse piston to square the ring in the cylinderUse feeler gauge to measure the ring end gap 2.3,3.3The ring end gap must be within 0.006-0.014 in(0,15-0,35 mm) thruThe ring end gap must be within 0.005-0.015 in(0,13-0,38 mm)191 15Use feeler gauge to check groove side clearance of the piston ringsInstall each ring on its piston With the ring fully seated in its groove, make several checks around the piston 2.3, 3.3The side clearance must not exceed 0.0026 in(0,065 mm) thruThe side clearance must not exceed 0.004 in(0,10 mm)r,(}l 162.3, 3.3Measure the connecting rod deflection at the small end of the rod to determine the amount of wear of the crankpin and connecting rod bearing The connecting rod deflection is 0.022 into 0.056 in(0,6-1,5 mm)Replace crankshaft assembly if deflection exceeds tolerance