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Subjects>Auto>Boats and Watercraft

What is this extra 3rd oil fill or vent hole in the lower unit of your 40HP Mercury Mariner outboard at the gearbox area that is not shown in the shop manual?

BrentHolland ∙

Lvl 1

∙ 16y ago

Updated: 12/18/2022

The top two holes are a fill level, and a vent hole. Remove both of these plugs when filling the gearcase to ensure proper oil level, and ease of filling.

Wiki User

∙ 16y ago

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