Yamaha 115-225 HP Outboards Service Manual, Page 141Get this manual
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AND INSPECTION
GEAR CASE 1) Using soft brush and solvent, clean the case and water passage2) Visually inspect the gear case for cracks, corrosion or distortionIf any crack or excessive corrosion is found, replace the gear case151500-0
BEARING HOUSING 1) Using soft brush and solvent, clean the housing thoroughly2) Visually inspect the housing for cracks and corrosionIf any damage is found, replace the bearing housing
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