Mercury Mariner 4, 5, and 6HP 4-Stroke Factory Service Manual, Page 130Get this manual

Mercury Mariner 4, 5, and 6HP 4-Stroke Factory Service Manual, Page 130

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CYLINDER HEAD
- Keepers (2) per ValveValve Spring RetainerValve SpringValve Spring SeatIntake Valve

2 Place clean rag under the head to support the valvesUse suitable box end wrench