Mercury Mariner 30/40 4-Stroke Outboard Service Manual 1998, Page 214Get this manual

Mercury Mariner 30/40 4-Stroke Outboard Service Manual 1998, Page 214

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CYLINDER HEAD
ValveSpring Seat Valve Seal Valve Spring Spring Retainer Valve Keepers

1 Always use new valve seals 2 Apply engine oil to the valves and valve seats3 Install valves as