1987-1993 Mercury Mariner Outboards 70/75/80/90/100/115HP 3 and 4-cylinder Factory Service Manual, Page 212Get this manual
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Exhaust Plate Components
29 28 27 25
1 22 20 31 32 11 30 24
17 16 35 18
5B-6 LOWER UNIT 90-136452 495