Yamaha Outboards 3P Service Manual, Page 55Get this manual
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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 case1530000
WATER PUMP HOUSING 1) Inspect the water pump housing for signs of twisting or scratches of the inner cartridgeIf twisted, or if it is scratched excessively, replace the housing2) During the above operation, inspect the impeller plate, and replace this if damaged