1992 Johnson Evinrude "EN" 9.9 thru 30 Service Manual, P/N 508142, Page 185Get this manual
Inspection
1Before any inspection process can begin, all internal components must be clean and free of excess oilRefer to Cleaning, this Section2Make visual inspection of all internal componentsCheck for unusual wear patterns, scuffing or deterioration of aluminum parts, heat-related discoloration of bearings or bearing surfaces, and broken components1381 3Check for cylinder head warpage using piece of bar stock or machinist's straightedge and feeler gauge set Cylinder head warpage must not exceed 0.004 in(0,10 mm) end to endResurface or replace head if warpage exceeds this dimension4Use micrometer to measure the diameter of each crankpin and main bearing journalThe lower main bearing journal would only be measured if the bearing was removed for another reason Refer to Engine Specifications, Section 1, for dimensions1391 5Use telescoping gauge or inside reading micrometer to inspect each cylinder bore for an out-of-round, oversize, or tapered conditionBe sure the gauge or micrometer is perfectly square in the bore when measuring1401 6Measure each cylinder in at leasttwo areas as shownEach area should be measured twiceThe difference between the two measurements in each area is the cylinder out-of-round dimension The cylinder must not be out-of-round by more than 0.003 in(0,08 mm)7The dimensional difference between the two areas is cylinder taper The cylinder taper must not exceed 0.002 in(0,05 mm) 8The difference between your measurements and standard bore dimension is cylinder oversizeRefer to Engine Specifications, Section 1, for dimensions The cylinder must not be oversize by more than 0.003 in(0,08 mm)