Mercury MerCruiser 5.7 Horizon, User Manual

Page: 90 / 114

Section 5 - Maintenance
Page 82 90-899883173 DECEMBER 2007
IMPORTANT: Flushing is needed If the engine package has been operated in salty,
brackish, mineral‑laden or polluted water. For best results flushing is recommended after
each outing and before cold weather and extended storage.
NOTICE
Disconnecting the seawater inlet hose will cause water to enter the bilge resulting in
engine damage. Close the seacock before disconnecting the seawater inlet hose. Plug
the seawater inlet hose immediately after disconnecting it.
1.
Models with Walter V-Drive Transmissions:
a. Close the seacock, if equipped, and then disconnect the seawater inlet hose from
the transmission seawater inlet fitting.
NOTICE
Disconnecting the seawater inlet hose will cause water to enter the bilge resulting in
engine damage. Close the seacock before disconnecting the seawater inlet hose. Plug
the seawater inlet hose immediately after disconnecting it.
b. If not equipped with a seacock, disconnect the seawater inlet hose from the
transmission seawater inlet fitting and immediately plug the seawater inlet hose
to prevent water from siphoning into the engine or boat.
6091
c. Using suitable adapter, connect the flushing water hose to the transmission
seawater inlet fitting.
d. Proceed to step 3
2.
All other models:
a. Close the seacock, if equipped, and then disconnect the seawater inlet hose from
the seawater pump inlet fitting.
NOTICE
Disconnecting the seawater inlet hose will cause water to enter the bilge resulting in
engine damage. Close the seacock before disconnecting the seawater inlet hose. Plug
the seawater inlet hose immediately after disconnecting it.