1985 OMC 65, 100 and 155 HP Models Commercial Service Repair manual, PN 507450-D, Page 321Get this manual

1985 OMC 65, 100 and 155 HP Models Commercial Service Repair manual, PN 507450-D, Page 321

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Screw in vacuum testerPump out to 76-127 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 sus