Mercury Mariner 25HP 4-Stroke Outboard Service Manual 1997, Page 260Get this manual
16Remove FORWARD gear 18Insert p'nion bearing race PULLER (91-825200A 1) through gear case and position inside of pinion bearing raceInsert DRIVER (91-13779) into puller through drive shaft cavity and drive out race
aForward Gear
17Remove shift shaft assemblyaPuller (91-825200A 1)Driver (91013779)