Mercury Optimax 115, 135, 150, 175, DFI year 2000 and up service manual., Page 327Get this manual

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POWERHEAD
dRing End GapDot or LetterPiston Ring

3 Use Piston Ring Expander (91-24697) and install piston rings (dot side up) on each pistonSpread rings just enough to slip over pist

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