1993 Johnson Evinrude "ET" 90 degrees CV Service Manual, P/N 508285, Page 140Get 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
1391 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
f411 5Visually inspect crankcase seal rings for worn, grooved,
Replace any ring that is less than 0.154 in thick
or chipped conditionIf rings appear worn, use micrometer to measure ring thickness
Install seal rings in their original positions on crankshaft after inspection