Mercury Force 9.9, 15HP Outboards Service Manual, Page 128Get this manual

Mercury Force 9.9, 15HP Outboards Service Manual, Page 128

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G, DISASSEMBLING PISTON 1 Remove piston(s) from block
2 Remove piston rings using ring expander (Special Tool NoFT-8926)

AS NEEDED
Remove piston pin retai ner rings with snap