Mercury Mariner 30/40 4-Stroke Outboard Service Manual 1998, Page 217Get this manual

Mercury Mariner 30/40 4-Stroke Outboard Service Manual 1998, Page 217

CYLINDER HEAD
Rocker Arm Shaft Assembly
1Apply engine oil to the rocker shaft and arms2Locate the end of the rocker shaft that gets installed towards driven gear (oil holes will line-up with the mating oil holes in the cylinder head)3Slide the rocker arms onto rocker shaft as shown4Install brackets on rocker shaft as shown

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