Mercury INSTALLATION MANUAL D7.3L D-TRONIC - Manual (Page 19)

D7.3L D-TRONIC DIESEL ENGINES - BRAVO MODELS
Page 19 of 90
RETURN HOSE CONNECTION
76023
a
a -
Location on Water Circulation Pump for Hot Water Return (Bayonet Fitting
Replaces Plug)
Seawater Connections
D7.3L D-Tronic and D7.3L D-Tronic LD models must be equipped with a
through hull or
through transom
water supply to ensure sufficient water flow to the engine. The transom
assembly needs to be modified with the water passage block-off plate kit (P/N 818304A1)
provided. It is necessary to cut the water hose that is located between the bell housing and
the gimbal housing. This allows water to continue through the drive for cooling. Refer to
“Drive Unit Seawater Routing.” outlined later. Read and observe the following to select the
proper seawater pickup hose, seacock size and seawater strainer.
Seawater Connections - General Information
SEAWATER PICKUP HOSE
Seawater inlet hose connections must be made with wire reinforced hose of adequate wall
thickness to prevent it from collapsing from pump suction. Be sure to secure hose connec-
tions with hose clamps. Secure hose to prevent contact with any moving parts of the engine.
Seawater Pickup Hose Inner Diameter
All Models 1-1/2 in. (38mm)
SEACOCK SIZE
Seacock used must have an internal cross-sectional area equal to or greater than seawater
inlet hose to prevent restricting water flow. Install valve in an area where it will be easily ac-
cessible and supported adequately to prevent hose fatigue. A brass ball or gate valve is re-
quired.
Seacock Size
(Internal Cross-Sectional Area Equal to or Greater Than Size Shown)
All Models 1-1/2 in. (38mm)