Mercury Mariner 25HP 4-Stroke Outboard Service Manual 1997, Page 143Get this manual
Oil Pump Assembly 1Reassemble the oil pump assembly
Oil Pump Installation
1Place O-ring seals on the oil pumpLubricate the O-rings with oil2Prime the oil pump by pouring approximately flo oz(30 ml) of engine oil into the oil pump body
2Lubricate the outer and inner rotors thoroughly with engine oil
a Cover Seal Outer Rotor
c Inner RotorShaft
eCross Pin
Fasten cover with two screwsApply Loctite 222 to threadsTighten screws to the specified torque
aa-Ring Seals