Inspection And Maintenance Schedule - Mercury 8 Bigfoot 4-Stroke User Manual
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The owner/operator is not to modify the engine in any manner that would alter the horsepower or allow emissions
levels to exceed their predetermined factory specifications.
Inspection And Maintenance Schedule
BEFORE EACH USE
•
Check engine oil level. See Fuel & 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.
•
Remote Control Models ‑ 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 salt water.
EVERY 100 HOURS OF USE OR ONCE YEARLY, WHICHEVER OCCURS FIRST
•
Lubricate all lubrication points. Lubricate more frequently when used in salt water. 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 fuel line filter for contaminants. See Fuel System.
•
Check corrosion control anodes. Check more frequently when used in salt water. See Corrosion Control
Anode.
•
Check and adjust valve clearance, if necessary.
•
Drain and replace gearcase lubricant. See Gearcase Lubrication.
•
Check power tilt fluid. See Checking Power Tilt Fluid.
•
Lubricate splines on the driveshaft.
•
Remote control models ‑ Check control cable adjustments.
•
Inspect timing belt. See Timing Belt Inspection.
•
Check tightness of bolts, nuts, and other fasteners.
•
Check cowl seals to make sure seals are intact and not damaged.
•
Check internal cowl sound reduction foam (if equipped) to make sure foam is intact and not damaged.
•
Check that the intake silencer (if equipped) is in place.
•
Check that the idle relief muffler (if equipped) is in place.
•
Check for loose hose clamps and rubber boots (if equipped) on the air intake assembly.
EVERY 300 HOURS OF USE OR THREE YEARS
•
Replace water pump impeller (more often if overheating occurs or reduced water pressure is noted).
1. These items should be serviced by an authorized dealer.
MAINTENANCE
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