1963-1973 Mercruiser all Engines and Drives Service Manual Books 1 and 2, Page 697Get this manual
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MERCRUISER 225-255 D-TR DRIVE UNIT GENERAL SERVICE RECOMMENDATIONS Threaded parts are rig ht hand (RH)unlcss othcnvise indicate dD rive unit hould be comp letely disassembledinspected and clean edif e