Mercury Mariner 4, 5, and 6HP 4-Stroke Factory Service Manual, Page 206Get this manual

Mercury Mariner 4, 5, and 6HP 4-Stroke Factory Service Manual, Page 206

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GEAR HOUSING

Zinc Anode
1 Remove and replace zinc anode if more than 50 consumed
NOTE: 2000 model year outboards have rectangular style zinc anode

aZinc Anode (19