NOTICE
Water trapped in the seawater section of the cooling system can cause corrosion or freeze damage. Drain the seawater
section of the cooling system immediately after operation or before any length of storage in freezing temperatures. If the boat
is in the water, keep the seacock closed until restarting the engine to prevent water from flowing back into the cooling system.
If the boat is not fitted with a seacock, leave the water inlet hose disconnected and plugged.
IMPORTANT: Mercury Diesel recommends that propylene glycol antifreeze be used in the seawater section of the cooling
system for cold weather (freezing temperature), seasonal storage, or extended storage. Make sure that the propylene
glycol antifreeze contains a rust inhibitor and is recommended for use in marine engines. Be certain to follow the
manufacturer's recommendations.
3. Fill a container with approximately 5.6 Liter (6.0 US qt) of propylene glycol antifreeze and tap water mixed to
manufacturer's recommendation to provide –73.3 °C (–100 °F) protection to the engine.
4. Disconnect the seawater inlet hose from the seawater pump. Temporarily connect an appropriate length piece of hose to
seawater pump and place the other end of the hose into the container of propylene glycol antifreeze and tap water.
a - Seawater pump
b - Container of propylene glycol
antifreeze and tap water
NOTE: Discharge of propylene glycol antifreeze into the environment may be restricted by law. Dispose of propylene glycol
antifreeze in accordance with federal, state, and local laws and guidelines.
5. Start the engine and operate at idle speed until the antifreeze mixture has been pumped into the engine seawater cooling
system.
6. Stop the engine.
7. Remove the temporary hose from the seawater pump.
8. Clean the outside of the engine and repaint any areas required with primer and spray paint. After the paint has dried, coat
the engine with the specified corrosion inhibiting oil or equivalent.
Description
Part Number
Mercury Light Gray Primer 92‑802878 52
Mercury Phantom Black 92‑802878Q 1
Corrosion Guard 92‑802878‑55
Mercury Diesel Cloud White 8M0071082
9. Your Mercury Diesel authorized repair facility should perform all checks, inspections, lubrications, and fluid changes
outlined in Maintenance Schedules.
10. Follow the battery manufacturer's instructions for storage and store the battery.
Extended Storage Instructions
IMPORTANT: Mercury Diesel strongly recommends that this service be performed by an Mercury Diesel authorized repair
facility.
1.
Read all precautions and perform all procedures found in Preparing Your Power Package for Seasonal or Extended
Storage.
2.
Read all precautions and perform all procedures found in Flushing and Draining the Seawater System.
3.
Read all precautions and perform all procedures found in Seasonal Storage Instructions.
4. Remove the seawater pump impeller and store away from direct sunlight. See a Mercury Diesel authorized repair facility
for additional information and service.
IMPORTANT: The seawater pump impeller material can be damaged by prolonged exposure to direct sunlight.
5. Place a caution tag at the instrument panel and in the engine compartment stating that the seawater pump is out and not to
operate the engine.
Section 5 - Storage
90-8M0133568 eng JUNE 2017 Page 59
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