1985 OMC 65, 100 and 155 HP Models Commercial Service Manual, PN 507450-D, Page 37Get this manual
Gearcase Lubrication Disconnect electrical connector(s) between statorcharge coil assembly and power pack to avoid accidentally starting motorSee Section 3Remove oil drainfill and oil level plugs from gearcaseWith motor in normal operation position, allow oil to drain completelyTo refill, place tube or pressure can nozzle of OMC HI-VIS Gearcase Lubricant in drainfill holeOn 65 and 100 modelsif OMC HI-VIS Gearcase Lubricant is not available, OMC Premium Blend Gearcase Lube can be used as an alternateDo not use OMC Premium Blend Gearcase lube on 155 modelsWith motor in normal operating position, fill until lubricant appears at oil level holeInstall oil level plug before removing lubricant tube or pressure can nozzle from oil drainfill holeDrainfill plug can then be installed securely without oil lossIf the proper tube or filler type can is not available, install drainfill plugSlowly fill gearcase through oil level hole allowing trapped air to escapeInstall plug and tighten to torque of 7-9 Nm (60-84 inIbs