1983 Johnson/Evinrude 2 thru V-6 outboards Service Repair Manual P/N 393765, Page 412Get this manual
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7 Pressure and vacuum test the gearcase as follows:
]Fill the gearcase with lubricant as follows:
Turn the gearcase so filldrain hole is upFill the gearcase with OMC HI-VIS Gearcase