Section 4 - Maintenance
Page 42
90-8M0113986
eng
DECEMBER 2015
11. Remove the pressure cap and add coolant to the specified level.
12. Install and securely tighten the pressure cap.
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.
NOTICE
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.
!
CAUTION
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. If the engine has the optional fuel cooler installed, move the fuel lines so they do not obstruct access to the engine coolant
drain plug.
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 (if
equipped)
e -
General location of engine coolant drain plug
f -
Engine control module
25571
a
b
c
d
e
f
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