Some general information for Mercury outboard users


Emission certificate placard

Each engine is equipped with an exhaust emission certificate placard, which indicates the exhaust emission level and the engine performance parameters (technical specifications) directly related to the emission.

Responsibility of the boat owner

The owner/pilot is required to maintain the engine to ensure that the emission level meets the standards specified in the certificate.

The owner/pilot must not modify the engine in any way, change the power or make the exhaust emission level exceed the factory specifications.

Inspection and maintenance items

Before each use

* Check the level of oil in the engine. See "Checking and Refilling Engine Oil" in the "Fuel and Oil" section for details.

* Visually inspect the fuel system for deterioration or leaks.

* Check that the outboard is tightly mounted on the center gear.

* Check the propeller blades for damage.

After each use

* The cooling system of the outboard should be cleaned if it is used in brackish water or sewage.

* In brackish water, rinse off any salt deposits with fresh water and flush the exhaust holes in the propeller and gearbox.

Every 100 hours or once a year (whichever is first due)

* Lubricate all lubrication points. If sailing in salt water, lubricate more often. See "Lubrication Points".

* If the engine is operated under severe conditions, such as prolonged towing, the interval between oil changes should be shortened.

* Replace the spark plugs after the first 100 hours of use or after one year. Inspect the spark plugs every 100 hours of use or once a year thereafter.

Spark plugs. Spark plugs may be replaced earlier than required.

* Drain and replace gearbox oil.

* Check fuel line filter for contamination.

* Check the corrosion prevention anode, more often if sailing in salt water.

* Lubricate the splines on the drive shaft.

* Replace water pump blades.

* Check bolts, nuts and other fasteners for tightness.

Flush the cooling system

Flush the internal waterways of the outboard with fresh water after each trip in saltwater, sewage or mineral-rich waters. This will help prevent deposits of contaminants from clogging the internal waterways. A Mercury Precision or Quicksilver flushing connection attachment (or equivalent) should be used.

NOTE: Do not run the engine while flushing the cooling system.

1. Remove the screw plug, gasket, and threaded hose fitting. 2.

Connect the water hose to the hose adapter. Turn on the tap and flush the cooling system for at least 3 to 5 minutes.

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