Reply To: OMC water pump question

[frankr]

That hole is drilled at an angle, connecting the water outlet to the well surrounding the drive shaft. The purpose is to keep the well filled with water, creating a water seal to prevent exhaust gasses from entering the pump via the drive shaft hole. The UPPER end of the angled hole will be blocked by the grommet, but the LOWER end of the hole should not be blocked. If blocked, it may cause erratic pumping.