Yamaha Outboard F15A F9.9C, FT9.9D F15 Service Manual, Page 336Get this manual
WATER PUMP (FT9.9D)
SERVICE POINTS
Impeller housing inspection 1Inspect: Impeller housing Cracksdamage Replace
Impeller and impeller housing cup inspection 1Inspect: Impeller Impeller housing cup Cracksdamage Replace