Mercury Mariner 4 and 5HP 4-Stroke Outboards Service Shop Manual 1999, Page 201Get this manual

GEAR HOUSING
Water Pump Base and Shift Shaft
IMPORTANT: Seal should be installed flush with water pump base as shown1Push new oil seal (a) into water pump base (b) using rod (c) and mandrel (d)2Lubricate seal lip with 24-C wrreflon Marine Lubricant

• ATV
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• Stern Drives