1995 Johnson/Evinrude Outboards 50 thru 70 3-cylinder Service Manual, Page 154Get this manual
Inspection 1Before any inspection process can begin, all internal components must be clean and free of excess oil 2Make 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 components
121 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
131 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 reason Refer 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 condition Be sure the gauge or micrometer is perfectly square in the bore when measuring