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Section 5 - Maintenance
9.
If the boat is in the water, perform an operational inspection of the seawater cooling system.
a.
Open the seacock, if equipped, or remove the plug and reconnect the seawater inlet hose.
b.
Start the engine and allow the seawater system to be filled and the engine to reach normal operating temperature.
c.
Check the seawater cooling system for leaks within an RPM range of 600 to 1400 RPM.
d.
Carefully monitor the engine operating temperature to ensure that it remains in normal operational range and that the
seawater cooling system is functioning properly.
Engine Seawater Pump Inspection
IMPORTANT: Mercury strongly recommends that this service be performed by a Mercury Diesel authorized repair facility.
Remove and inspect the engine seawater pump at the interval specified in the Maintenance Schedule. See your Mercury
Diesel authorized repair facility.
Replacing the Engine Coolant
Draining the Closed‑Cooling System
IMPORTANT: Due to the complex nature of this service Mercury Diesel strongly recommends that this service be performed by
a Mercury Diesel authorized repair facility.
Discharge of oil, coolant, or other engine/drive fluids into the environment is restricted by law. Use caution not to spill oil,
coolant, or other fluids into the environment when using or servicing your boat. Be aware of the local restrictions governing
the disposal or recycling of waste, and contain and dispose of fluids as required.
NOTE: For instructions on draining the seawater section, refer to Draining the Seawater System in this section.
IMPORTANT: Observe the following points.
•
Ensure that the engine is as level as possible to promote complete draining of the cooling system.
•
The closed‑cooling section must be filled year‑round with the required coolant. If the engine will be exposed to freezing
temperatures, ensure that the closed‑cooling section is filled with a solution of low silicate ethylene glycol antifreeze and
deionized, purified water properly mixed to protect the engine to the lowest temperature to which it will be exposed.
•
Do not use propylene glycol antifreeze in the closed‑cooling section of the engine.
A sudden loss of pressure can cause hot coolant to boil and discharge violently resulting in serious injury from burns. Allow
the engine to cool down before removing the coolant pressure cap.
1.
Allow the engine to cool.
2.
Remove the pressure cap from the expansion tank and coolant reservoir.
3.
Remove the fuel filter for access to the engine coolant drain plug. Refer to Water–Separating Fuel Filter.
4.
Move the fuel lines so they do not obstruct access to the engine coolant drain plug.
e
d
5.
Remove the engine coolant drain plug and drain the coolant into a suitable container.
NOTE: Allow the engine coolant system to drain completely.
Page 66
f
c
a
b
NOTICE
CAUTION
!
Port side of engine
a -
Throttle cable bracket
b -
14–pin electrical connector
c -
Water–separating fuel filter
d -
Fuel cooler with fuel lines moved to provide access
e -
General location of engine coolant drain plug
f -
Engine control module
25571
90-8M0069748
APRIL 2012
eng
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Troubleshooting
