Draining The Seawater System; Drain System Identification; Air Actuated Single-Point Drain System; Section 6 - Storage - Mercury Mercruiser Tow Sport 5.7 MPI Manual

Tube Ref No.
Premium Plus 2-cycle TC-
115
W3 Outboard Oil
Fuel System Treatment &
124
Stabilizer
2. Allow the engine to cool down.
IMPORTANT: Immediately wipe up any fuel spills or sprays.
3. Close the fuel shut off valve, if equipped. Disconnect and plug the fuel inlet fitting if not equipped with a fuel shut off valve.
4. Connect the remote fuel tank (with the fogging mixture) to the fuel inlet fitting.
IMPORTANT: Supply cooling water to the engine.
5. Start and operate the engine at 1300 RPM for five minutes.
6. After specified operating time is complete, slowly return throttle to idle RPM and shut engine off.
IMPORTANT: Ensure that some fogging mixture remains in the engine. Do not allow the engines fuel system to become
completely dry.
7. Replace the water separating fuel filter element. Refer to Section 5 for proper procedure.

Draining the Seawater System

Water can enter the bilge when the drain system is open, damaging the engine or causing the boat to sink. Remove the boat
from the water or close the seacock, disconnect and plug the seawater inlet hose, and ensure the bilge pump is operational
before draining. Do not operate the engine with the drain system open.
IMPORTANT: Only drain the seawater section of the closed cooling system.
IMPORTANT: The boat must be as level as possible to ensure complete draining of the cooling system.
Your power package is equipped with a drain system. Refer to Drain System Identification to determine which instructions
apply to your power package.
IMPORTANT: The engine must not be operating at any point during the draining procedure.
IMPORTANT: Mercury MerCruiser requires that propylene glycol antifreeze, mixed to the manufacturer's instructions, be used
in the seawater section of the cooling system for freezing temperatures or extended storage. Ensure that the propylene glycol
antifreeze contains a rust inhibitor and is recommended for use in marine engines. Be certain to follow the propylene glycol
manufacturer's recommendations.

Drain System Identification

Air Actuated Single-Point Drain System

a
b
Closed cooling models
a - Blue drain plug location
b - Blue air pump
c - Air manifold
d - Green indicators
90-8M0076545 NOVEMBER 2012
eng
Description
c
d
Where Used
Fuel system
Fuel system
CAUTION
!
a
6124
Seawater cooled models

Section 6 - Storage

Part No.
92-858026K01
92-8M0047932
c
b
d
6125
Page 59