Draining The Seawater System-350/377 Mag Ect And Seacore 350 Mag Ect; Draining The Seawater System; Drain System Identification - Mercury 350 MAG Manual

Running out of fuel can damage catalyst components. Do not allow the fuel tanks to become empty during operation.
1. In a 23 liter (6 US gal.) remote fuel tank mix:
a. 19 liter (5 US gal.) regular unleaded 87 octane (90 RON) gasoline
b. 1.89 liter (2 US qt.) Premium Plus 2‑Cycle TC‑W3 Outboard Oil
c. 150 ml (5 oz) Fuel System Treatment and Stabilizer or 30 ml (1 oz) Fuel System Treatment and Stabilizer Concentrate
Tube Ref No.
Premium Plus 2-cycle TC-
115
W3 Outboard Oil
Fuel System Treatment &
124
Stabilizer
2. Allow the engine to cool.
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 the specified operating time is complete, slowly return the throttle to idle and shut the engine off.
IMPORTANT: Ensure that some fogging mixture remains in the engine. Do not allow the engine's fuel system to become
completely dry.
7. Replace the water separating fuel filter element. Refer to Section 5.
Draining the Seawater System—350/377 MAG ECT and SeaCore 350 MAG
ECT

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. Make sure 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

NOTE: All drain plugs are fitted with blue wing nuts.
90-8M0050539 MAY 2011
eng
Description
!
NOTICE
Where Used
Fuel system
Fuel system
CAUTION
Section 6 - Storage
Part No.
92-858026K01
858071K01
Page 125