1987-1993 Mercury Mariner Outboards 70/75/80/90/100/115HP 3 and 4-cylinder Factory Service Manual, Page 156Get this manual

1987-1993 Mercury Mariner Outboards 70/75/80/90/100/115HP 3 and 4-cylinder Factory Service Manual, Page 156

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Install new piston pin lockrings (each side of piston) using Lockring Tool (91-77109A1)Make sure lockrings are properly seated in piston grooves Piston Ring Installation
CAUTION
Care must

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