Yamaha 115-225 HP Outboards Service Manual, Page 142Get this manual
ILOWR! '-1 -CLEANING AND INSPECTION 1535000
IMPELLER 1) Visually inspect the impeller for cracks, distortion or burningIf any damage is found, replace the impeller
1 540150
DRIVE SHAFT HOUSING 1) Using soft brush and solvent, clean the housing2) Visually inspect the housing for cracks or corrosionIf crack or excessive corrosion is foundreplace the housing
1545000
GEARS 1) Visually inspect the teeth and dogs on the gears for crack, peeling or distortion due to gear-crashingIf damage is found on any of the gears, replace with new one