1978 Johnson 175, 200, 235 HP Outboard Service Repair Manual P/N JM-7810, Page 135Get this manual
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GEARCASE PRESSUREVACUUM TESTS test gearcase sealing, proceed as fol1ows:
uight siti
oHlevel and
drain!fill plugsHI- VIS Gs Lube level holeSee Fig' level plug firstIl1stall