Mercury Mariner Outboard 225 3 Litre Service Manual 1994, Page 13Get this manual
the proper holes to prevent unsafe handling character istics CHECKING TRIM SYSTEM FLUID LEVEL IMPORTANT: This system is pressurized Remove fill screw (a) only when outboard is trimmed to the fullup" position Retighten fill screw securely 1Trim outboard to full positionTrim system fluid Upft can only be checked when outboard is in this position 2Remove fill screw and check fluid levelFluid level should be visible at this time
3If necessary, add Quicksilver Power Trim &Steering Fluid or; Automatic Transmission Fluid (ATF) Type F, FA or Oexron II to trim system