1999 Mercruiser HI-Performance GM 377 EFI Engine Service Manual, Page 27Get this manual
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MAINTENANCE
Gimbal Ring Clamping ScrewsRe-torque to 50-55 lbftEvery 50 Hours of Operation or Once Yearly, (67-74 N.m) Whichever Occurs FirstGimbal BearingLubricate Engine Coupling, Universal Joi