Yamaha Outboard F15A F9.9C, FT9.9D F15 Service Manual, Page 300Get this manual
PROPELLER SHAFT HOUSING ASS'Y (F15AF9.9C)
Bearings inspection 1Inspect: Bearing Pittingrumbling ReplaceNOTE:
Rotate the bearing and check if it turns smoothly
Propeller shaft housing inspection 1Clean: Propeller shaft housing (with soft brush and solvent) 2Inspect: Propeller shaft housing Cracksdamage Replace