Mercury Mariner 30/40 4-Stroke Outboard Service Manual 1998, Page 208Get this manual

Mercury Mariner 30/40 4-Stroke Outboard Service Manual 1998, Page 208

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CYUNDER HEAD

4 After installing the valve guide, ream the valve guide using valve guide reamer to obtain proper stem-to-guide clearance
aValve Guide Reamer (91-809497 Al)