1991 Johnson/Evinrude EI Outboards 2.3 thru 8 Service Manual, Page 143Get this manual
InspectionAll Models 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 bearing or bearing surfaces, and broken components
thruThe metering rods must be in place in the
crankcasePlace the long rod in the upper hole and the short rod in the lower hole
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 dimension
4Use 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 reasonRefer to Engine Specifications, Section 1, for dimensions
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 measuring