Mercury 25 EFI Service Manual page 445

3. Install a new face plate.
a
4. Install a new water pump cover gasket.
a
5. Install the drive key.
IMPORTANT: It is recommended that the impeller be replaced regardless of appearance. If the impeller must be reused, it
must be installed in the direction of original rotation. Installing the impeller with the vanes reversed from their previous set
will result in vane breakage shortly after the unit is returned to service.
6. Install a new impeller and align with the drive key.
a
b
7. Lubricate the inside circumference of the water pump liner with 2‑4‑C with PTFE.
90-8M0105568 eng MARCH 2016
a - Face plate
21039
a - Water pump cover gasket
21038
a - Impeller
b - Drive key
21037
© 2016 Mercury Marine
Gear Housing
Page 6A-39