Mercury Mariner 25HP 4-Stroke Outboard Service Manual 1997, Page 138Get this manual

Mercury Mariner 25HP 4-Stroke Outboard Service Manual 1997, Page 138

3Install the new valve guide and circlip using valve guide installer bushing along with the valve guide remover55807
Valve Seat Width Specificationa" Intake Valve Exhaust Valve 0.0350.043 in(0.91.1 mm)

Reface valve seat, use 6004515 valve seat cutterNOTE:When twisting cutterkeep an even downward pressure to prevent chatter marks

aValve Guide Remover (91 -809495A 1)Valve Guide Installer Bushing (91 -809496Al )

4After installing the valve guide, ream the valve guide using valve guide reamerto obtain proper stemto-guide clearance55808 55795

NOTE:1f resurfacing the valve seats is required, resurface the valve seats to the specified angles shown in chart55798

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