1985 OMC 65, 100 and 155 HP Models Commercial Service Repair manual, PN 507450-D, Page 301Get this manual

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Screw in vacuum testerPump out to 76127 mm (3" 5") of mercury and see if vacuum holdsThen pump out to 381 mm (15") of mercury and checkIf the gearcase fails to hold on either test, put oil around susp

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