1997+ Mercury 35/40HP 2 Cylinder Outboards Service Manual PN 90-826148R2, Page 286Get this manual
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Draining and Inspecting Gear Lubricant WARNING
aVent PlugWasherFillDrain PlugWasher
2 Inspect ge ar lubricant for metal particles (lubricant will have "metal flakeappe arance)Presen