Section 5 - Maintenance
90-8M0057081
eng
MARCH 2011
Page 85
IMPORTANT: Use only the specified coolant.
2. If the coolant is being replaced or the level is low, slowly add the specified coolant to the level indicated in the table.
Coolant level in expansion tank
QSD 2.0L
Within 25 mm (1 in.) of the top of the filler neck
Tube Ref No.
Description
Where Used
Part No.
123
Marine Engine Coolant
(Only available in Europe)
Closed cooling system
92-813054A2
Fleetguard Compleat with
DCA4, Fleetguard Part
Number CC2825
Closed cooling system
Obtain Locally
NOTICE
Without sufficient cooling water, the engine, the water pump, and other components will overheat and suffer damage. Provide
a sufficient supply of water to the water inlets during operation.
3. If the boat is out of the water, both the engine and sterndrive must be supplied with cooling water. See the
Flushing the
Seawater System
section of this manual.
4. Do not install the pressure cap. Start and operate the engine at fast idle speed between 600 and 1400 RPM. Add coolant as
necessary to maintain the coolant at the level specified previously.
IMPORTANT: When installing the pressure cap, be sure to tighten it securely to avoid coolant loss.
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 the presence of excessive temperature or 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
2.0
Within 25 mm (1 in.) of the top of the filler neck
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
galvanic corrosion
and, if it is not controlled, it will eventually cause the need for replacement of power package
components exposed to water.
To help control the effects of galvanic corrosion, Cummins MerCruiser Diesel 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
(90‑88181301).
IMPORTANT: Replace sacrificial anodes if eroded 50% or more. Cummins MerCruiser Diesel strongly recommends avoiding the
use of anodes from another manufacturer. Refer to your Cummins MerCruiser Diesel Authorized Repair Facility for additional
information.
Engine Corrosion Protection Components
The engine is equipped with a sacrificial anode located in the end cover of the engine aftercooler to assist in protecting the engine
and the seawater cooling system from corrosion.
Removal
1. Allow the engine to cool.
