Table of Contents
Advertisement
Section 4 - Maintenance
5.
Install the pressure cap after the engine has reached normal operating temperature (with the thermostat fully open) and the
coolant level remains constant.
6.
Test the engine operation. Observe the temperature gauge and check the engine for coolant leaks. If the temperature
gauge indicates excessive temperature or if the coolant is leaking, stop the engine immediately and inspect for the cause.
7.
After the first operation, allow the engine to cool.
8.
Remove the pressure cap and add the specified coolant to the level indicated in the table.
Coolant level in expansion tank
All models
Within 25 mm (1 in.) of the bottom of the filler neck, or between the upper and lower marks, if marked
9.
Install and securely tighten the pressure cap.
Corrosion Protection
General Information
Whenever two or more dissimilar metals (such as those found on this power package) are submerged in a conductive solution
such as saltwater, polluted water, or water with a high mineral content, a chemical reaction takes place causing electrical
current to flow between metals. The electrical current flow causes the metal that is most chemically active, or anodic, to erode.
This erosion is known as
package components exposed to water.
To help control the effects of galvanic corrosion, Mercury power packages come with several sacrificial anodes and other
corrosion protection devices. For a more comprehensive explanation of corrosion and corrosion protection refer to the Marine
Corrosion Protection Guide.
IMPORTANT: Replace sacrificial anodes if eroded 50% or more. Mercury strongly recommends avoiding the use of anodes
from other manufacturers. Refer to your Mercury Diesel authorized repair facility for additional information.
Engine Corrosion Protection Components
This engine is equipped with a sacrificial anode located on top of the aftercooler end cover to assist in protecting the engine
and the seawater cooling system from corrosion. It also contains a second sacrificial anode assembly on the stern end of the
fluid cooler.
Removal
1.
Allow the engine to cool.
Failure to close the seawater inlet or seacock when removing or replacing the anode plugs can lead to water damage. Close
the seacock or remove and plug the seawater inlet hose to prevent water from entering the anode plug holes.
2.
With the engine off, close the seacock, if equipped, or remove and plug the seawater inlet hose.
3.
Drain the seawater system. See Draining the Seawater System.
4.
Remove the anode assembly (anode plug and the sacrificial anode) from the top of the aftercooler end cover.
b
Page 62
galvanic corrosion and, if it is not controlled, it will eventually cause the need for replacement of power
a
NOTICE
a -
Aftercooler end cover
b -
Anode assembly
23266
90-8M0133679
JUNE 2017
eng
Advertisement
Table of Contents
Troubleshooting
