Mercury Mariner 30/40 4-Stroke Outboard Service Manual 1998, Page 472Get this manual
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BIGFOOT GEAR HOUSING
aThreaded Rod (Obtain Locally)WashersNutsOiallndicator Adaptor Kit (91-83155)Oiallndicator (91-58222A 1)Backlash Indicator Tool 6 Position Dial Indicator on appropriate line