Mercury Mariner Outboard 225 3 Litre Service Manual 1994, Page 185Get this manual
The outboard can be raised or lowered manually by opening the manual release valve to turns counterclockwiseClose manual release valve to hold outboard at the desired tilt position TrimIn" Angle Adjustment
Boat operation with outboard trimmed to the fullIn" trim angle [not using the trim angle adjustment bolt (a)) at planing speed may result In undesirable andor unsafe steering conditionsA water test for handlingsteering conditions is required after any trim angle adjustmentsIMPORTANT: Some boatmotor combinations not usIng the trim angle adjustment pin (a) and trimmed to the fullIn" trim angle position may not exhibit any undesira ble andor unsafe handling andor steering characteristics at planing speedIf so, not using the trim ang le adjustment bolt (a) may be advantageous to acceleration and planing water test is required to determine if these characteristics apply to particular boatmotor combination 51353