Inspection And Maintenance Schedule - Mercury 25 EFI FourStroke User Manual

Inspection and Maintenance Schedule

BEFORE EACH USE
• Check engine oil level. See Fuel and Oil ‑ Checking and
Adding Engine Oil.
• Check that lanyard stop switch stops the engine.
• Visually inspect the fuel system for deterioration or leaks.
• Check outboard for tightness on transom.
• Check steering system for binding or loose components.
• Visually check steering link rod fasteners for proper
tightness. See Steering Link Rod Fasteners.
• Check propeller blades for damage.
AFTER EACH USE
• Flush out the outboard cooling system if operating in salt or
polluted water. See Flushing the Cooling System.
• Wash off all salt deposits and flush out the exhaust outlet of
the propeller and gearcase with fresh water if operating in
saltwater.
EVERY 100 HOURS OF USE OR ONCE YEARLY,
WHICHEVER OCCURS FIRST
• Lubricate all lubrication points. Lubricate more frequently
when used in saltwater. See Lubrication Points.
• Change engine oil and replace the oil filter. The oil should
be changed more often when the engine is operated under
adverse conditions such as extended trolling. See Changing
Engine Oil.
• Replace spark plugs at first 100 hours or first year. After
that, inspect spark plugs every 100 hours or once yearly.
Replace spark plugs as needed. See Spark Plug Inspection
and Replacement.
• Inspect thermostat visually for corrosion and broken spring.
Make sure thermostat closes completely at room
temperature.
• Check engine low pressure fuel filter for contaminants. See
Fuel System.
1. These items should be serviced by an authorized dealer.
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MAINTENANCE
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