Mercury Mariner 25HP 4-Stroke Outboard Service Manual 1997, Page 226Get this manual
Oil Pump Removal 1Remove oil filter and pump from manifoldIMPORTANT: DO NOT disassemble the oil pumpThe pump is not serviceable
Tilt Relief Valve RemovalNOTE: The following procedures requires the use of Snap-On blind hole removal tool #CG-41 t1 with 516" attachment #41 -12Or rem oval tool can be fabricated with the material and specifications listed beow