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Section 5 - Maintenance
b.
Inspect the gasket in the pressure cap for damage and replace if necessary.
c.
The pressure cap maintains pressure on the cooling system and may not be holding pressure properly. To have the
cap tested, contact your Mercury Diesel authorized repair facility.
5.
Slowly add the coolant within 25 mm (1 in.) of the top of the expansion tank filler neck.
6.
If the boat is out of the water, both the engine and sterndrive must be supplied with cooling water. Refer to Flushing the
Seawater System section of this manual.
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.
7.
Do not install the pressure cap. Start and operate the engine at fast idle speed between 600–1400 RPM. Add coolant as
necessary to maintain the coolant at the level specified previously.
8.
Install the pressure cap after the engine has reached normal operating temperature (with the thermostat fully open) and the
coolant level remains constant.
IMPORTANT: When installing the pressure cap, be sure to tighten it securely to avoid coolant loss.
9.
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.
10. After the first operation, allow the engine to cool.
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.
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 formula of ethylene glycol organic acid technology
antifreeze that does not contain silicate and deionized 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.
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Gasket
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NOTICE
NOTICE
CAUTION
90-8M0089579
MARCH 2014
eng
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