Inspection And Maintenance Schedule - Mercury 200 User Manual

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.
• Visually check power steering fittings and hoses for leaks or signs of damage. Check tie bar
fasteners (multiple outboard rigs) for proper tightness.
• 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
• 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.
• Inspect thermostat visually for corrosion and/or for a broken spring. Make sure thermostat closes
completely at room temperature.
• Check engine water separating fuel filter for contaminants. Clean and/or replace filter. See Fuel
System.
• Check corrosion control anodes. Check more frequently when used in salt water. See Corrosion
Control Anodes.
• Drain and replace gearcase lubricant. See Gearcase Lubrication.
• Check power steering fluid. See Checking Power Steering Fluid.
• Inspect battery. See Battery Inspection.
• Saltwater usage. Remove and inspect spark plugs for corrosion and replace spark plugs as
necessary. Apply a thin coating of Anti‑Seize Compound only on threads of spark plug prior to
installation. See Maintenance ‑ Spark Plug Inspection and Replacement.
• Check wiring and connectors
• 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
IMPORTANT: Engine oil must be drained before removing gearcase to avoid oil spillage. Perform
scheduled water pump replacement in combination with an engine oil change.
• Replace water pump impeller (more often if overheating occurs or reduced water pressure is
1.
noted).
1. These items should be serviced by an authorized dealer.
MAINTENANCE
1.
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