1987-1993 Mercury Mariner Outboards 70/75/80/90/100/115HP 3 and 4-cylinder Factory Service Manual, Page 174Get this manual
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Drive Shaft and Water Pump Components (Continued) TORQUE REFNO27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 QUAN1 Impeller Drive Key Impeller Water Pump Assembly Water Tube Seal Water