Yamaha Outboard F15A F9.9C, FT9.9D F15 Service Manual, Page 286Get this manual
WATER PUMP (F15AF9.9C)
SERVICE POINTS
Impeller housing inspection 1Inspect: Impeller housing Cracksdamage Replace
Impeller and impeller housing cup inspection 1Inspect: Impeller Impeller housing cup Cracksdamage Replace