2001 Mercury Mariner 50-60HP Factory Service Manual, Page 358Get this manual
POWER TRIM
Oil Pump Installation
1Install spring, ball, lubricated o-ring and plastic seat to manifold2Check to see that o-rings are placed on bottom of pump3Install filter and filter seal under pumpInstall pump onto manifoldTorque screws to 70 lb-in(7.7 Nm)
aScrew (3) Torque to 70 lb-in(7.7 Nm)Suction Seat Assembly