Mercury Mariner Outboard 225 3 Litre Service Manual 1994, Page 210Get this manual
Motor Repair REMOVAL NOTE: Power Trim System does not have to be removed from outboard to repairreplace motorDISASSEMBLY Refer toMotor Disassembly" on page 58-27 to disassemble motor from pumpCLEANING AND INSPECTION
Inspect O-rings and replace if necessaryCarefully inspect
BRUSH REPLACEMENT
Brush replacement is required if brushes are pittedchipped, or if distance (a) between the brush pigtail and end of brush holder slot is 116 inor lessCheck distance with armature installed
power cord for cuts or lears which will allow water to enter motorReplace cord if cut or torn Clean, inspect, and test motor componentsRefer toBrush Replacement"" Armature Test"andField Tests" for inspection and test