Mercury Mariner 4, 5 102CC Sail 1990 Outboard Service Shop Manual, Page 66Get this manual
Crankshaft Assembly 1Thoroughly clean cra nkshaft with solvent and dry
5Visually inspect connecting rod for ,straightness6Inspect crankshaft bearings as ou tl in ed in "Bearings" following 7Inspect bea ring and oil seal surfaces tor grooves, pitti ng, scratc hes and or over heati Minor marks may beCleaned up" with roc loth8Inspect connect ing rod piston pin bearing surface for rust pittingwa ter etching marksspa Uing, chatter marksuneve wear and overheati (bluish discoloration)Minor markings ay "cleaned up" usi ng rocus lo th and slotted 38" diameter shaft chucked in drillOperate dri ll at high speed while keepin shaft at 90 deg rees angl to piston pin bore