Mercury Mariner 25HP 4-Stroke Outboard Service Manual 1997, Page 227Get this manual
1Unscrew plug from manifold and remove spring and poppet assemblyNOTE: Do not Jose shim that may be lodged in the plug2 Suction Seat Removal
1Unscrew plug from manifold and remove ball2Use pin punch and knock the filter and suction
Use the removal tool and pull out the pilot valveseat out from the inside of the manifold cavity
CAUTION
DO NOT use any tool on the suction seat as any damage to the surface will not allow the ball to seatd