Mercury MerCruiser D2.8L D-Tronic Service Manual page 710

SEAWATER COOLING SYSTEM
Removal
If boat is in water while working on seawater strainer, close seacock, if equipped.
If boat is not equipped with a seacock, remove and plug seawater inlet hose to pre-
vent a siphoning action that may occur, allowing seawater to flow from the drain
holes or removed hoses and enter the boat.
IMPORTANT: Be certain engine is OFF and cooling system is cold.
1. Models Equipped With A Seacock:
Page 6A-28
a. Close seacock (seawater inlet valve), if equipped.
a - Seacock (Seawater inlet valve)
(1.) Disconnect seawater inlet hose from seawater strainer.
a - Seawater Inlet Hose
b - Seawater Strainer
CAUTION
a
b
SERVICE MANUAL NUMBER 22
70355
a
50226
90-860074--1 FEBRUARY 2002