1987-1993 Mercury Mariner Outboards 70/75/80/90/100/115HP 3 and 4-cylinder Factory Service Manual, Page 198Get this manual

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7 Lightly turn drive shaft back-and-forth (no movement should be noticed at propeller shaft)8 Dial Indicator registers amount of backlash, which must be between specification shown in chartDIAL INDICA

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