Mercury MERCRUISER - Installing the Y-Fitting

NOTE: When not installing the through‑the‑hull or through‑the‑transom seawater pickup, refer to Installing the Seawater
Supply Hose
.
Seawater Pickups for Sterndrive Engine Models
Boat speed with the boat fully
loaded and operated within the
specified operating range
Bravo has side water
pickup
Bravo has dual water pickup
Through‑the‑hull or
through‑the‑transom
seawater pickup
64 km/h (40 mph) or greater.
Models operated above the 50th
parallel of the Northern
Hemisphere or below the 50th
parallel of the Southern
Hemisphere.
30180
Not required.
Refer to Installing the
Seawater Supply Hose.
Less than 64 km/h (40 mph)
30181
30180
Required.
Refer to Installing the
Y‑Fitting.
64 km/h (40 mph) or greater
30181
Required.
Refer to Installing the
Y‑Fitting.
Greater or less than 64 km/h
(40 mph).
Models operated above the 50th
parallel of the Northern
Hemisphere or below the 50th
parallel of the Southern
Hemisphere.
30181
30180
Not required.
Refer to Installing the
Seawater Supply Hose.
Installing the Y‑Fitting
Engine models that require a through‑the‑hull or through‑the‑transom seawater pickup require a Y‑fitting at the engine seawater
pump inlet port. The Y‑fitting directs the seawater from the sterndrive and through‑the‑hull or through‑the‑transom seawater
pickup to the engine's seawater pump to meet the minimum flow specifications.
a - Y‑fitting port to water inlet at
transom
b - Y‑fitting port to through‑the‑hull or
through‑the‑transom seawater
pickup
c - 10 cm (4 in.) hose, from seawater
pump inlet to Y‑fitting port
d - Seawater pump
b
c
a
d
56840
Models with Closed Cooling
90-8M0099748 eng DECEMBER 2015 © 2016 Mercury Marine Page 6C-5