Boat In The Water - Mercury Mercruiser Tow Sport 5.7 MPI Manual

Section 6 - Storage
3. On models with a seawater pickup pump, remove the two blue drain plugs. If the seawater pickup pump does not have
blue drain plugs, or you are unable to access them, loosen the clamps and remove both hoses.
a - Hose clamps
b - Blue drain plugs
4. Crank the engine over slightly with the starter motor to purge any water trapped in the seawater pickup pump. Do not allow
the engine to start.
5. After the cooling system has been drained completely, install the drain plugs, reconnect the hoses, and tighten all hose
clamps securely.

Boat in the Water

1. Close the seacock (if equipped) or remove and plug the water inlet hose.
2. Remove the blue drain plugs from the following locations. If necessary, clean out the drain holes using a stiff piece of wire.
Do so until the entire system is drained.
a. Port and starboard side of cylinder block
b. Bottom of exhaust manifolds
c. Water‑circulating pump hose
a
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a
b
b
a
b
a
a - Drain plug
6143
6145
a - Cylinder block drain
plug
b - Exhaust manifold drain
plug
6129
90-8M0076545 NOVEMBER 2012
eng